Bibliographies thématiques / PLANT DERIVATIVES

Littérature scientifique sur le sujet « PLANT DERIVATIVES »

Auteur : Grafiati
Publié le 11 septembre 2023

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Articles de revues sur le sujet "PLANT DERIVATIVES"

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Fan, Zhaoqian, Yukun Qin, Song Liu, Ronge Xing, Huahua Yu et Pengcheng Li. « Chitosan Oligosaccharide Fluorinated Derivative Control Root-Knot Nematode (Meloidogyne incognita) Disease Based on the Multi-Efficacy Strategy ». Marine Drugs 18, no 5 (22 mai 2020) : 273. http://dx.doi.org/10.3390/md18050273.

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Plant root-knot nematode disease is a great agricultural problem and commercially available nematicides have the disadvantages of high toxicity and limited usage; thus, it is urgent to develop new nematicides derived from nature substances. In this study, a novel fluorinated derivative was synthesized by modifying chitosan oligosaccharide (COS) using the strategy of multiple functions. The derivatives were characterized by FTIR, NMR, elemental analysis, and TG/DTG. The activity assays show that the derivatives can effectively kill the second instar larvae of Meloidogyne incognita in vitro, among them, chitosan-thiadiazole-trifluorobutene (COSSZFB) perform high eggs hatching inhibitory activity. The derivatives can regulate plant growth (photosynthetic pigment), improve immunity (chitinase and β-1,3-glucanase), and show low cytotoxicity and phytotoxicity. According to the multi-functional activity, the derivatives exhibit a good control effect on plant root-knot nematode disease in vivo. The results demonstrate that the COS derivatives (especially fluorinated derivative) perform multiple activities and show the potential to be further evaluated as nematicides.
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Gao, Kun, Yukun Qin, Song Liu, Ronge Xing, Huahua Yu, Xiaolin Chen, Kecheng Li et Pengcheng Li. « Synthesis, Characterization, and Anti-Phytopathogen Evaluation of 6-Oxychitosan Derivatives Containing N-Quaternized Moieties in Its Backbone ». International Journal of Polymer Science 2018 (1 août 2018) : 1–7. http://dx.doi.org/10.1155/2018/3970142.

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The structure modification of chitosan has great application potential. 6-Oxychitosan was prepared by specially oxidizing the C6-OH of chitosan, then 6-oxychitosan was reacted with three kinds of aldehydes to prepare N-quaternized 6-oxychitosan derivatives in this paper. The derivatives were characterized by FT-IR, NMR, and elemental analysis. The antimicrobial activity of these derivatives was tested against two common plant-threatening fungi and three plant disease bacteria. The results showed that N-quaternized 6-oxychitosan derivatives had good water-solubility and excellent antimicrobial activity. Moreover, derivative 3 which connected 8-hydroxyquinolines had the highest antimicrobial activity than the other derivatives. The inhibitory indices of derivative 3 against V. albo-atrum and P. hibernalis are 89.1% and 72.8% at 0.4 mg/ml. The MICs of 3 against X. oryzae, P. syringae, and E. rhapontici were 625, 625, and 156 mg/l, respectively. All the results indicate that derivative 3 has the potential of becoming an alternative to harmful agricultural chemicals.
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Palchykov, Vitalii, Nina Khromykh, Yurii Lykholat, Svitlana Mykolenko et Tetyana Lykholat. « Synthesis and Plant Growth Regulatory Activity of 3-Sulfolene Derivatives ». Chemistry & ; Chemical Technology 13, no 4 (15 décembre 2019) : 424–28. http://dx.doi.org/10.23939/chcht13.04.424.

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Kumar, K. Vinoth. « Biosynthesis of Silver Ag Nanoparticles using Plant Derivatives of Delonix elata ». International Journal of Trend in Scientific Research and Development Volume-2, Issue-4 (30 juin 2018) : 83–86. http://dx.doi.org/10.31142/ijtsrd12910.

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Mulat, Mulugeta, Raksha Anand et Fazlurrahman Khan. « Defensive Role of Plant-Derived Secondary Metabolites : Indole and Its’ Derivatives ». Current Biotechnology 9, no 2 (16 novembre 2020) : 78–88. http://dx.doi.org/10.2174/2211550109999200728153839.

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The diversity of indole concerning its production and functional role has increased in both prokaryotic and eukaryotic systems. The bacterial species produce indole and use it as a signaling molecule at interspecies, intraspecies, and even at an interkingdom level for controlling the capability of drug resistance, level of virulence, and biofilm formation. Numerous indole derivatives have been found to play an important role in the different systems and are reported to occur in various bacteria, plants, human, and plant pathogens. Indole and its derivatives have been recognized for a defensive role against pests and insects in the plant kingdom. These indole derivatives are produced as a result of the breakdown of glucosinolate products at the time of insect attack or physical damages. Apart from the defensive role of these products, in plants, they also exhibit several other secondary responses that may contribute directly or indirectly to the growth and development. The present review summarized recent signs of progress on the functional properties of indole and its derivatives in different plant systems. The molecular mechanism involved in the defensive role played by indole as well as its’ derivative in the plants has also been explained. Furthermore, the perspectives of indole and its derivatives (natural or synthetic) in understanding the involvement of these compounds in diverse plants have also been discussed.
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Biessy, Adrien, et Martin Filion. « Phloroglucinol Derivatives in Plant-Beneficial Pseudomonas spp. : Biosynthesis, Regulation, and Functions ». Metabolites 11, no 3 (20 mars 2021) : 182. http://dx.doi.org/10.3390/metabo11030182.

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Plant-beneficial Pseudomonas spp. aggressively colonize the rhizosphere and produce numerous secondary metabolites, such as 2,4-diacetylphloroglucinol (DAPG). DAPG is a phloroglucinol derivative that contributes to disease suppression, thanks to its broad-spectrum antimicrobial activity. A famous example of this biocontrol activity has been previously described in the context of wheat monoculture where a decline in take-all disease (caused by the ascomycete Gaeumannomyces tritici) has been shown to be associated with rhizosphere colonization by DAPG-producing Pseudomonas spp. In this review, we discuss the biosynthesis and regulation of phloroglucinol derivatives in the genus Pseudomonas, as well as investigate the role played by DAPG-producing Pseudomonas spp. in natural soil suppressiveness. We also tackle the mode of action of phloroglucinol derivatives, which can act as antibiotics, signalling molecules and, in some cases, even as pathogenicity factors. Finally, we discuss the genetic and genomic diversity of DAPG-producing Pseudomonas spp. as well as its importance for improving the biocontrol of plant pathogens.
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Beck, Ellen J., Bruce Twitchin et Lewis N. Mander. « Radio labelling of the gibberellin plant growth inhibitor 16,17-dihydro-GA5 ». Canadian Journal of Chemistry 82, no 2 (1 février 2004) : 293–300. http://dx.doi.org/10.1139/v03-202.

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An improved five-step procedure has been developed for the synthesis of the gibberellin plant growth inhibitor 16,17-dihydro-GA5 from gibberellic acid. The 3-13C and 3-14C derivatives of this material have also been prepared by excising C-3 from the carbon skeleton (ozonolysis of a Δ2-alkene derivative and subsequent retro-Claisen reaction) and then reassembling the A-ring by means of an intramolecular aldol reaction.Key words: gibberellin, growth inhibitor, degradation, Radio labelling, Wittig reaction.
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Tomczak, Elwira, Władysław Kamiński et Dominika Szczerkowska. « Fractional Derivatives for Description of Sorption Kinetics in the Plant Sorbent - Metal Ions System ». Ecological Chemistry and Engineering S 20, no 3 (1 septembre 2013) : 499–506. http://dx.doi.org/10.2478/eces-2013-0037.

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Abstract It was examined if buckwheat hull has a potential to be used to adsorb heavy metal ions Zn(II), Cd(II), Co(II), Cu(II), Ni(II) from water. The research involved experiments aimed at the determination of sorption kinetics taking into consideration changes of concentration in a solution and sorbent over time. According to the literature data, kinetics is described with the use of pseudo first-order equations. Application of fractional derivatives for the description of sorption kinetics enables the development of the generalised sorption kinetics equation. Result analysis with this concept requires making a computational procedure using gamma functions and infinite series. Kinetics description using fractional derivatives will be equations with two parameters ie fraction of derivative α and the kinetics constant K dependent on the analysed sorbent-adsorbate system.
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Skalicka-Woźniak, Krystyna, Janusz Szypowski et Kazimierz Głowniak. « HPLC Analysis of Kaempherol and Quercetin Derivatives Isolated by Different Extraction Techniques from Plant Matrix ». Journal of AOAC INTERNATIONAL 94, no 1 (1 janvier 2011) : 17–21. http://dx.doi.org/10.1093/jaoac/94.1.17.

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Abstract Soxhlet extraction, ultrasound extraction, and accelerated solvent extraction (ASE), followed by RP-HPLC with a photodiode array detector was used for the determination of flavonoids in fruits of Peucedanum alsaticum. Three compounds were identified: a kaempherol derivative (astragalin), and two quercetin derivatives (quercitrin and hiperoside). The highest extraction yields of the selected compounds were obtained by use of exhaustive ASE.
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Yan, Tay Karh, Asnuzilawati Asari, Siti Aishah Salleh et Wahizatul Afzan Azmi. « Eugenol and Thymol Derivatives as Antifeedant Agents against Red Palm Weevil, Rhynchophorus ferrugineus (Coleoptera : Dryophthoridae) Larvae ». Insects 12, no 6 (13 juin 2021) : 551. http://dx.doi.org/10.3390/insects12060551.

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Coconut palms in Malaysia are infested by a destructive invasive pest, RPW since 2007, and the pest’s population is difficult to control. At present, RPW control management mainly relies on the use of monocrotophos, which is administered by the trunk injection method. However, this pesticide can negatively impact human health and the ecosystem. Plant EO that can be used as a bio-pesticide is highly recommended as an alternative to monocrotophos because of its target-specific and eco-friendly properties. The antifeedant activity of eight eugenol and thymol derivatives from clove and thyme EOs were tested against the fourth instar larvae of RPW through oral bioassay for 14 days. Relative growth rate (RGR), relative consumption rate (RCR), the efficiency of conversion of ingested food (ECI), and the feeding deterrent index (FDI) were compared and analyzed. All of the derivatives showed antifeedant activity, particularly the eugenol derivative, 4-allyl-2-methoxy-1-(4-trifluoromethyl-benzyloxy)-benzene (FDI = 54.14%) and the thymol derivative, 2-isopropyl-4-methyl-2-((4-nitrobenzyl) oxy) benzene (FDI = 53.88%). Both of them showed promising results on their ability to be the most effective antifeedant agents in each derivative group. There was no significant difference in the effectiveness of the eugenol-based and thymol-based derivatives, but the ether derivative group (FDI = 45.63%) had a significantly stronger effect than the ester derivative group (FDI = 39.71%). This study revealed that the compound in ether form is more effective than the compound in ester form as an antifeedant agent against RPW larvae, regardless of the plant EO that the compound is derived from.
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Thèses sur le sujet "PLANT DERIVATIVES"

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Hoong, Seng Soi. « Synthesis of oligomers/polymers from plant oil derivatives ». Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/57716/.

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The work presented in this thesis represents the chemical modifications of unsaturated plant oils to yield oligomeric/polymeric polyols suitable for polyurethane synthesis. Chapter 1 provides the introduction to the chemistry of polyurethanes, plant oils and plant oil based polyols. Chapter 2 focus on making oligomeric polyols from unsaturated plant oils through epoxidation and subsequent epoxide ring opening oligomerization that yielded oligomeric polyols. The properties of these oligomeric polyols were influence by the level of unsaturation of the plant oils. In addition, catalyst loading, monomer concentration and reaction time play vital role in determining the properties of the oligomeric polyols. Plant oil based polyols were also prepared by epoxide ring opening with renewable polyhydric alcohols that provide a variety of plant oil based polyols for polyurethane synthesis. Chapter 3 focus on the synthesis of polyurethanes (PU) from various types of plant oil based polyols as well as the evaluation of the mechanical properties of these synthesized PU. The tensile test of the PU shows that the mechanical properties were related to the structure and functionalities of the plant oil based polyols. The bulk of Chapter 4 discusses the copolymerization of epoxidized plant oils with tetrahydrofuran and the use of these copolymers for the synthesis of PU. The properties of the copolymers were related to the epoxidized oils used in the reaction and therefore influence the mechanical properties of the PU synthesized from them. Finally, Chapter 5 is a collection of work on the one-pot oligomerization of unsaturated fatty acid and plant oils with and without catalyst as well as the synthesis of PU based on these polyols.
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Miao, Xiaowei. « Ruthenium-catalyzed olefin metathesis of plant oil derivatives ». Rennes 1, 2010. http://www.theses.fr/2010REN1S224.

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With the scheduled end of the fossil era, the search for renewable carbon sources is a domain of intense researches. Among the potential renewable sources of raw materials, vegetable oils and fats have received much attention. Olefin metathesis is a very powerful tool in organic synthesis and polymer synthesis, and was shown to be a method of choice for the transformation of fat and oil derivatives. In this thesis, we have shown the ruthenium-catalyzed cross-metathesis of renewable fatty acid derivatives with acrylonitrile to give access to various N-containing compounds in high yields. Slow addition of catalyst was applied to improve TONs. The transformations of fatty acid derivatives with other functionalized olefins such as methyl acrylate, acrylic acid and acrolein were also performed with success. The metathesis catalyst residue was proven to be efficient hydrogenation catalyst in a sequential cross-metathesis/hydrogenation process leading to saturated amino-ester monomers
Avec la fin programmée de l'ère fossile, la recherche de sources de carbone renouvelables est un domaine de recherche intense. Parmi les sources renouvelables, les huiles végétales ont suscité beaucoup d'attention. La métathèse d'oléfine est un outil puissant en synthèse, et elle s'est avérée être une méthode de choix pour la transformation des dérivés d'huiles végétales. La métathèse croisée d'esters gras insaturés, dérivés des huiles végétales, avec des oléfines fonctionnalisées telles que des composés acryliques, a le potentiel de produire des composés bifonctionnels. Dans cette thèse, nous avons montré que la métathèse croisée des dérivés d'acides gras avec l'acrylonitrile, catalysée par les catalyseurs de ruthénium donne accès à des composés azotés divers avec des rendements élevés. L'addition lente de catalyseur a offert des TONs (turnover) élevés. Nous avons montré que le résidu de catalyseur de métathèse peut être employé comme catalyseur efficace d'hydrogénation
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Davidson, Deborah Nicole. « Chemical and spectroscopic studies of chromone derivatives ». Thesis, Rhodes University, 1992. http://hdl.handle.net/10962/d1006857.

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Various chromone derivatives have been used in asthma therapy, and their biological activity is apparently related to certain chemical features which include conformation and acidity. In the present study, substituent effects on conformation and acidity have been explored in chromone systems with potential biological activity. A range of variously substituted symmetrical chromone-2-carboxamides (including a series of N,N-dimethylchromone-2-carboxamides) have been prepared via chromone-2-carboxylic acids, which, in turn, were prepared from the corresponding o-hydroxyacetophenones. The N,N-dimethylchromone-2-carboxamides were prepared by reacting the appropriate chromone-2-carbonyl chlorides with dimethylammonium chloride in pyridine, in an approach which resolved various problems encountered in the preparation of these compounds. Substituent effects on the conformation of chromone-2-carboxamides have been explored using dynamic NMR spectroscopy, and the observed splitting of the N-alkyl signals has been attributed to slow site-exchange of the N-alkyl substituents. Dynamic NMR frequency separations and coalescence temperatures have been used to calculate rotational energy barriers, and substituent effects on these rotational energy barriers have been analysed. The possible implication of ring-opening of chromones in chromone pharmacology has also been examined. A range of 3-(2-hydroxybenzoyl)acrylamides has been prepared via the dimethylamine-mediated ring-opening of N,N-dimethylchromone-2-carboxamides and the E-double-bond configuration of the ring-opened products has been unambiguously established by single crystal analysis of the parent system. The configuration and conformation of the crystal structure of the parent system have been shown, using IR and NMR spectroscopic, and molecular graphics techniques, to be maintained in solution and to characterise the whole series. ¹H and ¹³C NMR spectroscopy have also been used to study the dimethylamine-mediated ring-opening of disodium cromoglycate. The kinetics of the dimethylamine-mediated ring-opening of N,N-dimethylchromone-2-carboxamides have been studied using UV spectroscopy. These reactions have been shown to follow third-order kinetics overall and a mechanism accommodating the observed third-order kinetics has been proposed. Substituent effects have been further investigated by the potentiometric determination of the pKa (pK [subscript a]) values for a series of chromone-2-carboxylic acids. The relationship between acidity and the observed rate constants has been explored and has verified that the observed rate constants are sensitive to the influence of meta-substituents on the stability of the phenoxide ion "leaving group" rather than C-2 electrophilicity.
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Samaha, Hiba. « Biocatalysis of chlorophyllase in ternary micellar system using chlorophyll derivatives as substrates ». Thesis, McGill University, 1996. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=24039.

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A partially purified chlorophyllase, obtained from alga Phaeodactylum tricornutum, was assayed for its hydrolytic activity towards the pheophytin in ternary micellar systems of hexane/Tris-HCl/surfactant. A wide range of surfactants, sorbitans (Span 20, 40, 60, 80 and 85) and polysorbates (Tween 20, 40, 60, 80 and 85), was used. The use of either 50 $ mu$M of Span 85 or 1 $ mu$M of Tween 80 increased the hydrolytic activity of chlorophyllase by 110 and 23%, respectively. The optimum values of pH, enzyme content, incubation time and temperature for the hydrolytic activity of chlorophyllase were determined as 8.25, 8 $ mu$g protein/ml, 60 min and 27.5$ sp circ$C, respectively. The enzyme was assayed for its hydrolytic activity in the most appropriate ternary system containing Span 85 with purified pheophytin, as well as chlorophyll derivatives, as substrates. Moreover, the values of $V sb{ rm max}/K sb{ rm m}$ ratio for chlorophyllase, using the partially purified pheophytin as substrate, in ternary systems with Span 85 and Tween 80 as surfactants, were 0.15 and 0.08, respectively; however, the value of $V sb{ rm max}/K sb{ rm m}$ ratio for the enzyme, in the ternary system with Span 85, using purified pheophytin as substrate was 0.07. The addition of optimized amounts of individual membrane lipids, L-$ alpha$-phosphatidylcholine, L-$ alpha$-phosphatidyl-DL-glycerol and $ beta$-carotene increased the hydrolytic activity of chlorophyllase, using partially purified pheophytin as substrate, by 50, 36 and 10%, respectively, for Span 85, and 30, 48 and 15%, respectively, for Tween 80; in addition, these lipids increased the enzyme activity by 6, 23 and 31%, respectively, in the Span 85 media, using purified pheophytin as substrate. Phytol showed a competitive inhibitory effect on chlorophyllase activity in both Span and Tween systems containing partially purified pheophytin substrate; however, phytol had an uncompetitive inhibitory effect on the enzyme activity in the S
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Fowles, A. M. « The preparation and biological activity of some 2-alkylated gibberellin Asub(4) and Asub(1) derivatives ». Thesis, University of Bristol, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370827.

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Ward, Jane Louise. « Probing the mechanism of gibberellin 20-oxidase and a structure-activity study of methyl jasmonate and related derivatives ». Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361109.

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Valdivia, Ciro Pablo Kopp. « Tests on the Elaboration of Soybean milk, Derivatives, and Industrial Feasibility Project ». BYU ScholarsArchive, 1997. https://scholarsarchive.byu.edu/etd/5446.

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This work was done with the purpose of evaluating different forms of soybean milk processing, the product acceptance by the public, and to do a study on the feasibility for the production of milk at a small scale to be used as a nutritional supplement in school breakfasts. The soybean milk was prepared with 2 varieties "(Cristalina and Doko)" and two periods of enzymatic inactivation (Before and After) of the grain mush. The "organoleptic" quality was evaluated through surveys and its posterior statistical analysis. Parameter quality was also considered just as did the microbiologic analysis and the conservation tests. The surveys showed that the products obtained were of regular acceptance. The statistical results indicate that the best treatment was that of the variety "doko" with its enzymatic inactivation previous to the trituration. The degree of microbiologic contamination is moderate, it is within the ranges permitted by human consumption. The conservation tests showed that soybean milk without conservatives can have, if refrigerated, a duration similar to that of cow's milk. The financial economic analysis showed that it is possible for the installation of small rural soybean milk processing plants (VAN=2058.68, TIR=34.8). Finally, it is concluded that soybean milk can be constituted as part of a fundamental basic food to lighten the high malnutrition present in the rural and urban areas of our country.
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Bailey, Keir. « Investigating the heterologous expression of plant secondary metabolic enzymes to produce curcuminoids and curcuminoid derivatives ». Thesis, University of York, 2016. http://etheses.whiterose.ac.uk/16284/.

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Curcuminoids are highly bioactive polyketide chemicals produced in the rhizomes of the turmeric plant (Curcuma longa). In addition to giving turmeric powder its distinctive yellow colour and flavour, these molecules elicit a plethora of medicinal effects. This project aimed to biosynthesize curcuminoids and their derivatives using the metabolic engineering of Baker’s yeast (Saccharomyces cervisiae) and tobacco (Nicotiana benthamiana). Phenylpropanoids, sustainably derived from bio-refinery waste, were to be used as starting materials. To convert phenylpropanoids into curcuminoids three enzymatic steps were needed: this involved the cloning and expression of 4-coumarate CoA ligase 5 (4CL5) from Arabidopsis thaliana and diketide-CoA synthase (DCS) and curcuminoid synthase 1 (CURS1) from C. longa. Protein extract from yeast expressing 4CL5 was able to convert both natural and non-natural phenylpropanoids to their corresponding phenylpropanoyl-CoA esters. However, protein extracts from yeast transformed with either DCS or CURS1 did not yield the corresponding enzyme activity. Furthermore, it was concluded that tobacco was not an optimal chassis for curcuminoid production as both phenylpropanoid substrates and curcuminoid products were metabolised by endogenous enzymes in the leaf tissue. Despite their bioactivities, curcuminoids are poorly bioavailable reducing their medicinal potential. Regiospecific glycosylation, performed by UDP-glycosyltransferases (UGTs), is a known strategy to improve a molecule’s solubility. Diglucosylated curcuminoids are 10 000 times more soluble in water than the aglycone. Using metabolomics and 14C radiolabelling assays C. longa was investigated as a source of novel curcuminoid UGTs.
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Malele, Son Rainalds Richard Sigalla. « Anthracene derivatives in plant tissue cultures : the occurence and biotransformation of 1,8-dihydroxyanthracene derivatives in tissue cultures of some species of Cassia, Rheum and Rumex and comparison with plants of Cassia artemisioides ». Thesis, University of Bradford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328056.

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Marcolini, Graziella <1977&gt. « Soil application of Meliaceae derivatives : effect on carbon and nitrogen dynamics in the soil-plant system ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amsdottorato.unibo.it/5530/1/Marcolini_Graziella_tesi.pdf.

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The effect of soil incorporation of 7 Meliaceae derivatives (6 commercial neem cakes and leaves of Melia azedarach L.) on C and N dynamics and on nutrient availability to micropropagated GF677 rootstock was investigated. In a first laboratory incubation experiment the derivatives showed different N mineralization dynamics, generally well predicted by their C:N ratio and only partly by their initial N concentration. All derivatives increased microbial biomass C, thus representing a source of C for the soil microbial population. Soil addition of all neem cakes (8 g kg-1) and melia leaves (16 g kg-1) had a positive effect on plant growth and increased root N uptake and leaf green colour of micropropagated plants of GF677. In addition, the neem cakes characterized by higher nutrient concentration increased P and K concentration in shoot and leaves 68 days after the amendment. In another experiment, soil incorporation of 15N labeled melia leaves (16 g kg-1) had no effect on the total amount of plant N, however the percentage of melia derived-N of treated plants ranged between 0.8% and 34% during the experiment. At the end of the growing season, about 7% of N added as melia leaves was recovered in plant, while 70% of it was still present in soil. Real C mineralization and the priming effect induced by the addition of the derivatives were quantified by a natural 13C abundance method. The real C mineralization of the derivatives ranged between 22% and 40% of added-C. All the derivatives studied induced a positive priming effect and, 144 days after the amendment, the amount of C primed corresponded to 26% of added-C, for all the derivatives. Despite this substantial priming effect, the C balance of the soil, 144 days after the amendment, always resulted positive.
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Livres sur le sujet "PLANT DERIVATIVES"

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Khiari, Ramzi, Mohammed Jawaid et Mohamed Naceur Belgacem, dir. Annual Plant : Sources of Fibres, Nanocellulose and Cellulosic Derivatives. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-2473-8.

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M, Wallsgrove R., et Rothamsted Experimental Station, dir. Amino acids and their derivatives in higher plants. Cambridge [England] : Cambridge University Press, 1995.

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Anjum, N. A., S. S. Gill et R. Gill, dir. Plant adaptation to environmental change : significance of amino acids and their derivatives. Wallingford : CABI, 2014. http://dx.doi.org/10.1079/9781780642734.0000.

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Ėrdeli, G. S. Izobutiraty--novyĭ klass retardantov. Voronezh : Izd-vo Voronezhskogo universiteta, 1992.

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Ahmad, Naseem, et Mohammad Faisal, dir. Thidiazuron : From Urea Derivative to Plant Growth Regulator. Singapore : Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8004-3.

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Takehiko, Yamamoto, dir. Chemistry and applications of green tea. Boca Raton : CRC Press, 1997.

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7

Nauen, Ralf. Aphid toxicology and plant systemic properties of an isecticidal tetramic acid derivative. Portsmouth : University of Portsmouth, School of Biological Sciences, 2002.

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Shaffer, Daniel. Final report : Contamination of diesel engine lubrication oil by plant oil derivative fuels. [Helena?] : prepared for Montana Dept. of Natural Resources and Conservation, 1986.

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Kholiolchev, Khristo. Onomasiologische und derivative Struktur der bugarischen Phytonyme : Beitrag zur bulgarischen volkstümlichen Phytonymie. Wien : "Freunde des Hauses Wittgenstein", 1990.

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Bondavalli, Andrea. Cyber-Physical Systems of Systems : Foundations – A Conceptual Model and Some Derivations : The AMADEOS Legacy. Cham : Springer Nature, 2016.

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Chapitres de livres sur le sujet "PLANT DERIVATIVES"

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Hemingway, Richard W., Seiji Ohara, Jan P. Steynberg, E. Vincent Brandt et Daneel Ferreira. « C-H Hetcor NMR Studies of Proanthocyanidins and their Derivatives ». Dans Plant Polyphenols, 321–37. Boston, MA : Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3476-1_18.

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Sparapano, L., P. Lerario et G. Anelli. « Production of Anthraquinone Derivatives by Phoma Tracheiphila ». Dans Phytotoxins and Plant Pathogenesis, 395–98. Berlin, Heidelberg : Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-73178-5_38.

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Chauveau, Michèle, Isabelle Funes et Jean Roussaux. « Effects of Adenine Derivatives on Permeability and Dehydrogenase Activities of Potato Mitochondria ». Dans Plant Mitochondria, 77–80. Boston, MA : Springer US, 1987. http://dx.doi.org/10.1007/978-1-4899-3517-5_9.

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Dar, Ovas Ahmad, Manzoor Ahmad Malik, Shahid-ul-Islam, Parveez Gull et Athar Adil Hashmi. « Curcumin and Its Derivatives - Isolation, Synthesis, and Applications ». Dans Plant-Based Natural Products, 145–74. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119423898.ch8.

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Rauter, Amélia P., Maria S. Pais, Christina Duarte, Ana Ana Eusébio, Lígia Pinto, Christina Simões et Joaquim S. Cabral. « Papain Inhibition by New α-Methylene-γ-Lactone Carbohydrate Derivatives ». Dans Plant Cell Biotechnology, 305–11. Berlin, Heidelberg : Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73157-0_31.

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Tsurushima, T., C. Ji, Y. Okinaka, Y. Takeuchi, J. J. Sims, S. L. Midland, M. Yoshikawa, N. Yamaoka et N. T. Keen. « Syringolide Derivatives for Receptor Studies ». Dans Molecular Genetics of Host-Specific Toxins in Plant Disease, 139–40. Dordrecht : Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5218-1_16.

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Perchellet, Jean-Pierre, Hala U. Gali, Elisabeth M. Perchellet, Darren S. Klish et Andrew D. Armbrust. « Antitumor-Promoting Activities of Tannic Acid, Ellagic Acid, and Several Gallic Acid Derivatives in Mouse Skin ». Dans Plant Polyphenols, 783–801. Boston, MA : Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3476-1_47.

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Ellis, B. E. « Metabolism of Caffeoyl Derivatives in Plant Cell Cultures ». Dans Proceedings in Life Sciences, 164–73. Berlin, Heidelberg : Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-70717-9_16.

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Tobiason, Fred L. « MNDO and AM1 Molecular Orbital and Molecular Mechanics Analyses of (+)-Catechin, (-)-Epicatechin, and their 3-O-Acetyl Derivatives ». Dans Plant Polyphenols, 459–78. Boston, MA : Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3476-1_26.

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López-García, Gabriel, Amparo Alegría, Reyes Barberá et Antonio Cilla. « Antiproliferative Effects and Mechanism of Action of Phytosterols Derived from Bioactive Plant Extracts ». Dans Nutraceuticals and Natural Product Derivatives, 145–65. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119436713.ch7.

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Actes de conférences sur le sujet "PLANT DERIVATIVES"

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Novitskaya, L. L., N. A. Galibina, Yu L. Moschenskaya, T. V. Tarelkina, N. N. Nikolaeva et K. M. Nikerova. « Change in the differentiation program for cambium derivatives in sucrose and auxin gradient ». Dans IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-317.

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Feilhauer, Hannes, et Sebastian Schmidtlein. « Mapping plant strategy types and derivatives with imaging spectroscopy ». Dans IGARSS 2012 - 2012 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2012. http://dx.doi.org/10.1109/igarss.2012.6352148.

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Muraviev, V. S., et L. V. Dyaduchenko. « THIENO[2,3-B]PYRIDINES DERIVATIVES AS SOYBEAN PLANT GROWTH REGULATORS ». Dans STATE AND DEVELOPMENT PROSPECTS OF AGRIBUSINESS Volume 2. DSTU-Print, 2020. http://dx.doi.org/10.23947/interagro.2020.2.683-686.

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We have carried out the synthesis and screening of soybean growth regulators in a series of substituted thieno[2,3-b]pyridines. The compounds, which have a high growth-regulating effect, were detected. According to the field tests, the substances have a positive effect in formation of the yield structure and provide seed quality.
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Samilyk, M. M., et Ye V. Demydova. « SECTION 21. POWDERS FROM DERIVATIVES OF WILD PLANT FRUIT PROCESSING ». Dans SUSTAINABLE FOOD CHAIN AND SAFETY THROUGH SCIENCE, KNOWLEDGE AND BUSINESS. Baltija Publishing, 2023. http://dx.doi.org/10.30525/978-9934-26-328-6-21.

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Khamidullina, L. A., P. D. Tobysheva, E. A. Rybina, O. E. Cherepanova et A. V. Pestov. « Plant growth biostimulants based on synthetic polyaminosaccharides ». Dans 2nd International Scientific Conference "Plants and Microbes : the Future of Biotechnology". PLAMIC2020 Organizing committee, 2020. http://dx.doi.org/10.28983/plamic2020.117.

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Рябцова, Надежда. « METHODS OF FORMATION OF PLANT NAMES AND THEIR DERIVATIVES IN FRENCH ». Dans LINGUISTIC UNITS THROUGH THE LENS OF MODERN SCIENTIFIC PARADIGMS. Baskir State University, 2022. http://dx.doi.org/10.33184/yevssnp7-2022-12-16.13.

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Galibina, N. A., L. L. Novitskaya, Yu L. Moschenskaya et K. M. Nikerova. « Ectopic expression of CLE41 in xylem leads to impaired orientation of cell divisions of cambial derivatives in Karelian birch ». Dans IX Congress of society physiologists of plants of Russia "Plant physiology is the basis for creating plants of the future". Kazan University Press, 2019. http://dx.doi.org/10.26907/978-5-00130-204-9-2019-111.

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Salehi, P., F. Nemati, K. Babanezhad-Harikandei, N. Hadian, M. Bararjanian et I. Bruno. « Novel noscapine derivatives as potent anticancer and antiprotozoal agents ». Dans 67th International Congress and Annual Meeting of the Society for Medicinal Plant and Natural Product Research (GA) in cooperation with the French Society of Pharmacognosy AFERP. © Georg Thieme Verlag KG, 2019. http://dx.doi.org/10.1055/s-0039-3399682.

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Ku, HC. « Polyphenolic derivatives from propolis attenuates hypertension-induced heart failure ». Dans 67th International Congress and Annual Meeting of the Society for Medicinal Plant and Natural Product Research (GA) in cooperation with the French Society of Pharmacognosy AFERP. © Georg Thieme Verlag KG, 2019. http://dx.doi.org/10.1055/s-0039-3400073.

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Bani Younes, Ahmad, et James Turner. « Feedback Control Sensitivity Calculations Using Computational Differentiation ». Dans ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51439.

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Feedback control is a powerful methodology for handling model and parameter uncertainty in real-world applications. Given a useful nominal plant model for developing the control approach, it is well-known that optimal solutions only perform well for a limited range of model and parameter uncertainty. A higher-order optimal nonlinear feedback control strategy is presented where the feedback control is augmented with feedback gain sensitivity partial derivatives for handling model uncertainties. The computational differentiation (CD) toolbox is used for automatically generating higher-order partial derivatives for the feedback gain differential equations. An estimator is assumed to be available for predicting the model parameter changes. The optimal gain is computed as a Taylor series expansion in the gains, where the feedback gains are expanded as a function of the system model parameters. Derivative enhanced optimal feedback control is shown to be robust to large changes in the model parameters. Numerical examples are presented that demonstrate the effectiveness of the proposed methodology.
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Rapports d'organisations sur le sujet "PLANT DERIVATIVES"

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Thomashow, Linda, Leonid Chernin, Ilan Chet, David M. Weller et Dmitri Mavrodi. Genetically Engineered Microbial Agents for Biocontrol of Plant Fungal Diseases. United States Department of Agriculture, 2005. http://dx.doi.org/10.32747/2005.7696521.bard.

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The objectives of the project were: a) to construct the site-specific integrative expression cassettes carrying: (i) the chiA gene for a 58-kDa endochitinase, (ii) the pyrrolnitrin biosynthesis operon, and (iii) the acdS gene encoding ACC deaminase; b) to employ these constructs to engineer stable recombinant strains with an expanded repertoire of beneficial activities; c) to evaluate the rhizosphere competence and antifungal activity of the WT and modified strains against pathogenic fungi under laboratory and greenhouse conditions; and d) to monitor the persistence and impact of the introduced strains on culturable and nonculturable rhizosphere microbial populations in the greenhouse and the field. The research generally support our concepts that combining strategically selected genes conferring diverse modes of action against plant pathogens into one organism can improve the efficacy of biological control agents. We hypothesized that biocontrol agents (BCAs) engineered to expand their repertoire of beneficial activities will more effectively control soilborne plant pathogens. In this work, we demonstrated that biocontrol activity of Pseudomonas fluorescens Q8r1-96 and Q2-87, both producing the antibiotic 2,4-diacetylphloroglucinol (2,4-DAPG) effective against the plant pathogenic fungus Rhizoctonia solani, can be improved significantly by introducing and expressing either the 1.6-kb gene chiA, encoding the 58-kDa endochitinase ChiA from the rhizosphere strain SerratiaplymuthicaIC1270, or the 5.8-kb prnABCDoperon encoding the broad-range antibiotic pyrrolnitrin (Prn) from another rhizosphere strain, P. fluorescens Pf-5. The PₜₐcchiAandPₜₐcprnABCDcassettes were cloned into the integrative pBK-miniTn7-ΩGm plasmid, and inserted into the genomic DNA of the recipient bacteria. Recombinant derivatives of strains Q8r1-96 and Q2-87 expressing the PₜₐcchiA or PₜₐcprnABCD cassettes produced endochitinase ChiA, or Prn, respectively, in addition to 2,4-DAPG, and the recombinants gave significantly better biocontrol of R. solani on beans under greenhouse conditions. The disease reduction index increased in comparison to the parental strains Q8r1-96 and Q2-87 to 17.5 and 39.0% from 3.2 and 12.4%, respectively, in the case of derivatives carrying the PₜₐcchiAcassette and to 63.1 and 70% vs. 2.8 and 12,4%, respectively, in the case of derivatives carrying the PₜₐcprnABCDcassette. The genetically modified strains exhibited persistence and non-target effects comparable to those of the parental strains in greenhouse soil. Three integrative cassettes carrying the acdS gene encoding ACC deaminase cloned under the control of different promoters were constructed and tested for enhancement of plant growth promotion by biocontrol strains of P. fluorescens and S. plymuthica. The integrative cassettes constructed in this work are already being used as a simple and efficient tool to improve biocontrol activity of various PGPR bacteria against fungi containing chitin in the cell walls or highly sensitive to Prn. Some parts of the work (e. g., construction of integrative cassettes) was collaborative while other parts e.g., (enzyme and antibiotic activity analyses) were fully synergistic. The US partners isolated and provided to the Israeli collaborators the original biocontrol strains P. fluorescens strains Q8r1-96 and Q2-87 and their mutants deficient in 2,4-DAPG production, which were used to evaluate the relative importance of introduction of Prn, chitinase or ACC deaminase genes for improvement of the biocontrol activity of the parental strains. The recombinant strains obtained at HUJI were supplied to the US collaborators for further analysis.
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Jander, Georg, et Daniel Chamovitz. Investigation of growth regulation by maize benzoxazinoid breakdown products. United States Department of Agriculture, janvier 2015. http://dx.doi.org/10.32747/2015.7600031.bard.

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Introduction Previous research had suggested that benzoxazinoids, a class of defensive metabolites found in maize, wheat, rye, and wild barley, are not only direct insect deterrents, but also influence other areas of plant metabolism. In particular, the benzoxazinoid 2,4-dihydroxy-7-methoxy-2H-1,4-benzoxa- zin-3(4H)- one (DIMBOA) was implicated in: (i) altering plant growth by interfering with auxin signaling, and (ii) leading to the induction of gene expression changes and secondary plant defense responses. The overall goal of this proposal was to identify mechanisms by which benzoxazinoids influence other aspects of plant growth and defense. Specifically, the following hypotheses were proposed to be tested as part of an approved BARD proposal: Benzoxazinoid breakdown products directly interfere with auxin perception Global changes in maize and barley gene expression are induced by benzoxazinoid activation. There is natural variation in the maize photomorphogenic response to benzoxazinoids. Although the initial proposal included experiments with both maize and barley, there were some technical difficulties with the proposed transgenic barley experiments and most of the experimental results were generated with maize. Summary of major findings Previous research by other labs, involving both maize and other plant species, had suggested that DIMBOA alters plant growth by interfering with auxin signaling. However, experiments conducted in both the Chamovitz and the Jander labs using Arabidopsis and maize, respectively, were unable to confirm previously published reports of exogenously added DIMBOA effects on auxin signaling. Nevertheless, analysis of bx1 and bx2 maize mutant lines, which have almost no detectable benzoxazinoids, showed altered responses to blue light signaling. Transcriptomic analysis of maize mutant lines, variation in inbred lines, and responses to exogenously added DIMBOA showed alteration in the transcription of a blue light receptor, which is required for plant growth responses. This finding provides a novel mechanistic explanation of the trade-off between growth and defense that is often observed in plants. Experiments by the Jander lab and others had demonstrated that DIMBOA not only has direct toxicity against insect pests and microbial pathogens, but also induces the formation of callose in both maize and wheat. In the current project, non-targeted metabolomic assays of wildtype maize and mutants with defects in benzoxazinoid biosynthesis were used to identify unrelated metabolites that are regulated in a benzoxazinoid-dependent manner. Further investigation identified a subset of these DIMBOA-responsive compounds as catechol, as well as its glycosylated and acetylated derivatives. Analysis of co-expression data identified indole-3-glycerol phosphate synthase (IGPS) as a possible regulator of benzoxazinoid biosynthesis in maize. In the current project, enzymatic activity of three predicted maize IGPS genes was confirmed by heterologous expression. Transposon knockout mutations confirmed the function of the maize genes in benzoxazinoid biosynthesis. Sub-cellular localization studies showed that the three maize IGPS proteins are co-localized in the plastids, together with BX1 and BX2, two previously known enzymes of the benzoxazinoid biosynthesis pathway. Implications Benzoxazinoids are among the most abundant and effective defensive metabolites in maize, wheat, and rye. Although there is considerable with-in species variation in benzoxazinoid content, very little is known about the regulation of this variation and the specific effects on plant growth and defense. The results of this research provide further insight into the complex functions of maize benzoxazinoids, which are not only toxic to pests and pathogens, but also regulate plant growth and other defense responses. Knowledge gained through the current project will make it possible to engineer benzoxazinoid biosynthesis in a more targeted manner to produce pest-tolerant crops without negative effects on growth and yield.
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Jensen, R. Gene-enzyme relationships in somatic cells and their organismal derivatives in higher plants. Office of Scientific and Technical Information (OSTI), janvier 1989. http://dx.doi.org/10.2172/5473174.

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Jensen, R. Gene-enzyme relationships in somatic cells and their organismal derivatives in higher plants. Office of Scientific and Technical Information (OSTI), janvier 1989. http://dx.doi.org/10.2172/5473174.

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Weissenberg, Martin, Robert Wasserman et Arieh Levy. Studies on Calcinogenic Solanum Plants of Potential Value as Source of Active Vitamin D-like Derivatives. United States Department of Agriculture, mars 1987. http://dx.doi.org/10.32747/1987.7598898.bard.

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Tanny, Josef, Gabriel Katul, Shabtai Cohen et Meir Teitel. Micrometeorological methods for inferring whole canopy evapotranspiration in large agricultural structures : measurements and modeling. United States Department of Agriculture, octobre 2015. http://dx.doi.org/10.32747/2015.7594402.bard.

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Original objectives and revisions The original objectives as stated in the approved proposal were: (1) To establish guidelines for the use of micrometeorological techniques as accurate, reliable and low-cost tools for continuous monitoring of whole canopy ET of common crops grown in large agricultural structures. (2) To adapt existing methods for protected cultivation environments. (3) To combine previously derived theoretical models of air flow and scalar fluxes in large agricultural structures (an outcome of our previous BARD project) with ET data derived from application of turbulent transport techniques for different crops and structure types. All the objectives have been successfully addressed. The study was focused on both screenhouses and naturally ventilated greenhouses, and all proposed methods were examined. Background to the topic Our previous BARD project established that the eddy covariance (EC) technique is suitable for whole canopy evapotranspiration measurements in large agricultural screenhouses. Nevertheless, the eddy covariance technique remains difficult to apply in the farm due to costs, operational complexity, and post-processing of data – thereby inviting alternative techniques to be developed. The subject of this project was: 1) the evaluation of four turbulent transport (TT) techniques, namely, Surface Renewal (SR), Flux-Variance (FV), Half-order Time Derivative (HTD) and Bowen Ratio (BR), whose instrumentation needs and operational demands are not as elaborate as the EC, to estimate evapotranspiration within large agricultural structures; and 2) the development of mathematical models able to predict water savings and account for the external environmental conditions, physiological properties of the plant, and structure properties as well as to evaluate the necessary micrometeorological conditions for utilizing the above turbulent transfer methods in such protected environments. Major conclusions and achievements The major conclusions are: (i) the SR and FV techniques were suitable for reliable estimates of ET in shading and insect-proof screenhouses; (ii) The BR technique was reliable in shading screenhouses; (iii) HTD provided reasonable results in the shading and insect proof screenhouses; (iv) Quality control analysis of the EC method showed that conditions in the shading and insect proof screenhouses were reasonable for flux measurements. However, in the plastic covered greenhouse energy balance closure was poor. Therefore, the alternative methods could not be analyzed in the greenhouse; (v) A multi-layered flux footprint model was developed for a ‘generic’ crop canopy situated within a protected environment such as a large screenhouse. The new model accounts for the vertically distributed sources and sinks within the canopy volume as well as for modifications introduced by the screen on the flow field and microenvironment. The effect of the screen on fetch as a function of its relative height above the canopy is then studied for the first time and compared to the case where the screen is absent. The model calculations agreed with field experiments based on EC measurements from two screenhouse experiments. Implications, both scientific and agricultural The study established for the first time, both experimentally and theoretically, the use of four simple TT techniques for ET estimates within large agricultural screenhouses. Such measurements, along with reliable theoretical models, will enable the future development of lowcost ET monitoring system which will be attainable for day-to-day use by growers in improving irrigation management.
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