Journal articles: 'Hakea'

1

Ward McCabe, Stephen. "Hakea clavata." Cactus and Succulent Journal 82, no. 4 (July 2010): 149–51. http://dx.doi.org/10.2985/015.082.0402.

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Pearce, Ceridwen A., Paul Reddell, and Kevin D. Hyde. "Revision of the Phyllachoraceae (Ascomycota) on hosts in the angiosperm family, Proteaceae." Australian Systematic Botany 14, no. 2 (2001): 283. http://dx.doi.org/10.1071/sb00006.

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A literature review yielded seven Australian taxa within the Phyllachoraceae recorded from hosts in the angiosperm family Proteaceae, with three taxa from overseas. New collections and herbarium material were examined by using traditional microscopic characters. Seven new Australian taxa were identified. These include Phyllachora banksiae subsp. westaustraliensis on Banksia speciosa, Phyllachora tjapukiensis on Darlingia darlingiana, Phyllachora kylei on Dryandra spp., Phyllachora amplexicaulii on Hakea amplexicaulis, Phyllachora grevilleae subsp. clelandii on Hakea clavata and H. vittata, Phyllachora hakeicola subsp. cuttacuttae on Hakea arborescens and Phyllachora hakeicola subsp. tasmaniensis on Hakea lissosperma. We now recognise nine species, four subspecies and one variety within the Phyllachoraceae on Proteaceae in Australia, and Phyllachora rhopalina var. rhopalina and P. rhopalina var. macrospora from South America. In this paper, these taxa are described and illustrated by using interference contrast micrographs. A key to all known species of Phyllachoraceae on hosts in the Proteaceae is provided.

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Gordon, A. J., and C. L. Lyons. "Current Status ofCarposina autologa(Lepidoptera: Carposinidae), a Biological Control Agent of Silky Hakea,Hakea sericea(Proteaceae) and Rock Hakea,Hakea gibbosa(Proteaceae) in the Western Cape, South Africa." African Entomology 25, no. 1 (March 2017): 250–53. http://dx.doi.org/10.4001/003.025.0250.

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4

Barker, Robyn, and Bill Barker. "Plate 464. Hakea Rhombales Proteaceae." Curtis's Botanical Magazine 20, no. 2 (May 2003): 69–73. http://dx.doi.org/10.1111/1467-8748.00374.

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Johnston, Peter R. "Rhytismatales of Australia: the genus Marthamyces." Australian Systematic Botany 19, no. 2 (2006): 135. http://dx.doi.org/10.1071/sb05010.

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Six species of Marthamyces are reported for Australia. Three of the species are described as new, the others had previously been reported from Australia as species in the genera Propolis and Naemacyclus. Most of the Australian species are host-specialised: M. emarginatus is known only from Eucalyptus, M. gilvus from Cyperaceae, M. hakeae from Hakea, and M. oritis from Orites. Marthamyces barbatus, common on Eucalyptus, is known also from a single collection on Richea. Marthamyces quadrifida, although known from only a few Australian collections, is a widespread tropical species and is likely to be common on a range of hosts in northern Australia. All species are described and illustrated, and a key to the Australian Marthamyces species is provided.

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6

Apted, John. "Acute contact urticaria from Hakea suaveolens." Contact Dermatitis 18, no. 2 (February 1988): 126. http://dx.doi.org/10.1111/j.1600-0536.1988.tb02769.x.

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7

Williams, Paul R., and Peter J. Clarke. "Habitat Segregation by Serotinous Shrubs in Heaths: Post-fire Emergence and Seedling Survival." Australian Journal of Botany 45, no. 1 (1997): 31. http://dx.doi.org/10.1071/bt96076.

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Seeds of two serotinous shrub species generally restricted to the drier edges, and two serotinous shrub species commonly confined to the wetter drainage channels of upland sedge–heaths were assessed for germinability and used in manipulative field experiments. In post-fire field experiments the effects of habitat and manipulated soil moisture were examined to test if the distribution of adult plants was influenced by soil moisture at seed germination. The effects of habitat on seedling survival for 11 months were also assessed. One species from the edge zone, Banksia marginata Cav., and one from the channel zone, Hakea microcarpa R.Br., had germination preferences corresponding to the distribution of adult plants. The other edge species, Hakea dactyloides (Gaertner) Cav., did not show a significant preference for either zone. The second channel species, Callistemon pityoides F.Muell., did not germinate in the field or in a laboratory germination trial. Some evidence for soil-stored dormancy related to temperature and or waterlogging was found in both Hakea species. Overall the results suggest that for two species habitat segregation occurs when seeds are incorporated into the seed-bed and germination occurs. No differential survival effects across habitats were found in the first year of growth.

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8

Lee, HM. "The Biology of Hakea epiglottis Labill (Proteaceae)." Australian Journal of Botany 35, no. 6 (1987): 689. http://dx.doi.org/10.1071/bt9870689.

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Hakea epiglottis Labill. is a Tasmanian endemic with variable form and sexual types. The existence of dioecious and bisexual populations has been established. The distribution of these forms, their habitat, morphology and biological relationships are discussed.

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9

Groom, PK, and BB Lamont. "Ecogeographical Analysis of Hakea (Proteaceae) in South-Western Australia, With Special Reference to Leaf Morphology and Life Form." Australian Journal of Botany 44, no. 5 (1996): 527. http://dx.doi.org/10.1071/bt9960527.

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The genus Hakea Schrader (Proteaceae) has its world centre of diversity in south-western Australia; the majority (c. 70%) of species are endemic to this region. To examine the distribution of Hakea within south-western Australia, canonical correspondence analysis (CCA) was used on species presence and bioclimatic parameters in 0.5° x0.5° latitude-longitude grid cells. Of the 12 bioclimatic attributes initially applied, annual temperature and rainfall data, and indices of their variation, were best related to species distribution. Clustering of the species (on the CCA ordination) produced five distinct groups (not including species near the origin of the ordination) roughly representing floristic regions of southwestern Australia (Avon, Irwin, Eyre-Roe, southern Darling, northern-central Darling). Species distribution was then related to four morphological groups based on their leaf type (broad, terete) and post-fire life form (non-sprouter, resprouter). The highest percentage of terete-leaved non-sprouters occurred in areas of low-moderate rainfall and large annual temperature ranges (Avon and Eyre-Roe clusters), whereas terete-leaved resprouters displayed a very patchy distribution, accounting for less than 20% of the hakeas present in most of the grid cells. Broad-leaved resprouters dominated areas of strongly seasonal rainfall (Irwin and northern-central Darling clusters), with few species occurring in the drier Avon and Eyre-Roe districts. Broad-leaved non-sprouters were best represented in areas of low annual temperature (southern Darling and Eyre-Roe clusters). The distribution of non-sprouters and resprouters may be due to climatic factors affecting seedling recruitment and/or fire frequencies. Leaf morphology appears to be more directly related to species distribution, as broad leaves are favoured in regions of medium-high, seasonal rainfall (less stressful habitats) while terete leaves are better adapted to tolerate hot, dry environments.

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10

Lamont, Byron B., Tianhua He, and Sim Lin Lim. "Hakea, the world’s most sclerophyllous genus, arose in southwestern Australian heathland and diversified throughout Australia over the past 12 million years." Australian Journal of Botany 64, no. 1 (2016): 77. http://dx.doi.org/10.1071/bt15134.

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Hakea (Proteaceae) currently comprises over 150 species, with two-thirds confined to south-western Australia (SWA) and the remainder spread throughout Australia, especially along the eastern coast. We constructed a time-based molecular phylogeny for the genus and used area-assignment techniques to trace its biogeographic history. According to our area-cladogram analysis, there is a 95% probability that Hakea arose 18 million years ago (Ma) in the sandplains of SWA. From 12 Ma, the genus speciated and migrated into forest and onto granite outcrops within SWA, into the drier centre and then continued to the maritime forests of eastern Australia (EA) 3000 km away, and north-east to savanna grasslands. The Nullarbor Plain was an obstacle but it did not prevent eastward migration. Twelve west➔east, apparently allopatric, speciation events are identified that coincided with glacial maxima, but more likely represent sympatric speciation in SWA or central Australia, followed by further migration and speciation➔extinction➔speciation events across central to EA. During the period from 8 to 1 Ma, net speciation has been linear and strong in the sclerophyll shrublands of SWA and, to a lesser extent, the sclerophyll forests of EA. Four lines of evidence (historical distribution of sclerophyllous Proteaceae, historical subjection to aridity, species diversification patterns, relative allocation of drought-adapted traits) support our area-cladogram results that Hakea originated in SWA and gradually spread to all parts of Australia as suitable nutrient-impoverished, and open drought- and fire-prone habitats became available.

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11

Morais, Maria Cristina, João Alexandre Cabral, and Berta Gonçalves. "Seasonal Variation in Selected Biochemical Traits in the Leaves of Co-Occurring Invasive and Native Plant Species under Mediterranean Conditions." Plants 11, no. 9 (April 26, 2022): 1171. http://dx.doi.org/10.3390/plants11091171.

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The success of invasive alien species (IAS) is often linked to differences in functional traits in relation to other, either native or non-invasive, species. Two of the most problematic IAS in the Mediterranean area belong to Hakea and Acacia genera that often invade pine plantations. Therefore, the aim of this study was to assess the seasonal variations in photosynthetic pigments, total phenolics, and non-structural carbohydrates (NSC), including total soluble sugars (SS) and starch (St), and lipid peroxidation, in terms of malondialdehyde (MDA) in the leaves of evergreen species, two IAS (Hakea sericea and Acacia melanoxylon) and one native (Pinus pinaster), throughout 2019. All parameters showed a pronounced seasonal variability while also differing across species. Generally, the lowest contents of photosynthetic pigments, phenolics and SS were noted in early spring, along with the highest St and NSC values. On the other hand, higher photosynthetic pigment and lower NSC contents were measured in early autumn and early winter. When these parameters were compared across the three species, the IAS had significantly higher content of photosynthetic pigments, mainly chlorophyll b and total chlorophyll, and lower total phenolics and MDA concentrations in their leaves than Pinus pinaster. Differences in seasonal patterns were also observed. Hakea sericea and Acacia melanoxylon had considerably higher chlorophyll, SS and NSC contents in the early autumn, while Pinus pinaster had higher St and MDA contents in early summer. Overall, the biochemical characteristics of leaves of the studied IAS can explain their success in the Mediterranean area, in terms of tolerance to stressful environmental conditions.

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12

Poot, Pieter, Roy Bakker, and Hans Lambers. "Adaptations to winter-wet ironstone soils: a comparison between rare ironstone Hakea (Proteaceae) species and their common congeners." Australian Journal of Botany 56, no. 7 (2008): 574. http://dx.doi.org/10.1071/bt08155.

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In south-western Australia, a rare plant community is found on shallow, winter-wet ironstone soils, which occur on coastal plains as isolated islands in a matrix of surrounding deeper sandy soils. To test for local adaptation of species endemic to these communities and potential inhibitory effects of ironstone soils on other species, we compared two rare ironstone Hakea species with four of their common congeners. The common congeners were chosen from nearby winter-wet habitats on deeper sandy soils and from non-wetland woodland habitats (i.e. two species in each habitat group). Seedlings of all species were grown on ironstone soil and subjected to waterlogging in a glasshouse experiment. Significant habitat-related differences emerged only when seedlings were waterlogged. When compared with their controls, shoot and root growth rates of ironstone endemics were less affected by waterlogging than those of their common congeners. This was partly associated with their large accumulation of leaf starch, and their substantial adventitious-root formation. Leaves of ironstone endemics also exhibited consistently higher concentrations of Cu and Zn. In contrast to the effect of waterlogging in the glasshouse experiment, natural waterlogging of seedlings transplanted into ironstone communities led to high mortality, but only in the non-wetland Hakea species. Mortality was strongly associated with the intensity of flooding events, with very small differences in inundation level (10–15 mm) strongly influencing seedling survival. Our results suggest that the chemistry of the waterlogged ironstone soil, and species adaptations to it, are important for understanding distribution patterns of these Hakea species.

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13

Barr, John R., V. S. Murty, Keiichi Yamaguchi, Shangara Singh, David H. Smith, and Sidney M. Hecht. "5-Alkylresorcinols from Hakea amplexicaulis that cleave DNA." Chemical Research in Toxicology 1, no. 4 (July 1988): 204–7. http://dx.doi.org/10.1021/tx00004a003.

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14

Lytollis, William, Ralph T. Scannell, Haoyun An, V. S. Murty, K. Sambi Reddy, John R. Barr, and Sidney M. Hecht. "5-Alkylresorcinols from Hakea trifurcata, that cleave DNA." Journal of the American Chemical Society 117, no. 51 (December 1995): 12683–90. http://dx.doi.org/10.1021/ja00156a004.

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15

Sousa, Manuel Fernando, Arnoldo Rocha Façanha, Rui Manuel Tavares, Teresa Lino-Neto, and Hernâni Gerós. "Phosphate transport by proteoid roots of Hakea sericea." Plant Science 173, no. 5 (November 2007): 550–58. http://dx.doi.org/10.1016/j.plantsci.2007.08.006.

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16

Teixeira, G., A. Monteiro, and C. Pepo. "Leaf Morphoanatomy in Hakea sericeae and H. salicifolia." Microscopy and Microanalysis 14, S3 (September 2008): 109–10. http://dx.doi.org/10.1017/s1431927608089563.

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Hakea sericeae Schrader and H. salicifolia (Vent.) B. L. Burtt. are perennials, which belong to the Proteaceae family. Native to dry tropical zones from South Australia, they became aggressive species, particulary in damaged, dried and windy areas and are now considered invaders in some places of mainland Portugal. With no natural predators, the use of chemical control is the main way to manage these plants but they both show a small foliar area, therefore usually little success has been achieved.

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17

Eagles, Peter F. K., Alistair M. Stephen, and Shirley C. Churms. "Molecular structures of gum exudates from Hakea species." Phytochemistry 34, no. 3 (October 1993): 709–13. http://dx.doi.org/10.1016/0031-9422(93)85344-q.

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18

Kajanto, Anneli. "Suomalainen metsäteollisuus verkko-opetuksen kärjessä." Aikuiskasvatus 23, no. 1 (February 15, 2003): 49. http://dx.doi.org/10.33336/aik.93455.

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Suomalaiset metsäteollisuusyritykset ovat kehittäneet yhteistyössä VTT:n ja metsäteollisuuden laitetoimittajien kanssa verkko-oppimisympäristön metsäteollisuuden koulutukseen. Tämä suurisuuntainen yhteishanke saa hakea vertaistaan yritysmaailmassa. Mukana ovat mm. UPM-Kymmene, Metso, Jaakko Pöyry, Stora-Enso, Ahlström, Myllykoski ja Honeywell sekä opetushallitus. Yhteisten verkko-oppimisympäristöjen lisäksi joillain paperinvalmistajilla on sovellutuksia myös omiin erityistarpeisiinsa.

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19

Gordon, A. J. "The impact of the Hakea seed-moth Carposina autologa (Carposinidae) on the canopy-stored seeds of the weed Hakea sericea (Proteaceae)." Agriculture, Ecosystems & Environment 45, no. 1-2 (May 1993): 105–13. http://dx.doi.org/10.1016/0167-8809(93)90062-t.

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20

Korhonen, Vesa. "Akateemista toimijuutta ja oppimiskumppanuutta rakentamassa." Aikuiskasvatus 30, no. 2 (May 15, 2010): 94–105. http://dx.doi.org/10.33336/aik.93867.

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Mentorointiohjelmat käynnistyivät Tampereen yliopistossa 1990- ja 2000-lukujen taitteessa. Tavoitteet ovat liittyneet akateemisen työn ja uran erilaisiin esille nouseviin kysymyksiin. Ohjelmissa oli mahdollisuus hakea kumppania myös yliopiston ulkopuolelta. Tarinat mentoroinnista tuovat esille yliopistotyön hiljaista tietoa ja oppimista. Mentorointitarinat kertovat henkilökohtaisista oppimisprojekteista, jotka tähtäävät akateemiseen toimijuuden etsimiseen, löytämiseen, rakentamiseen tai vahvistamiseen akateemisen kulttuurin ristipaineissa.

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21

Kluge, R. L., and S. Neser. "Biological control of Hakea sericea (Proteaceae) in South Africa." Agriculture, Ecosystems & Environment 37, no. 1-3 (October 1991): 91–113. http://dx.doi.org/10.1016/0167-8809(91)90141-j.

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22

Starr, G. J., and S. M. Carthew. "Genetic Differentiation in Isolated Populations of Hakea carinata (Proteaceae)." Australian Journal of Botany 46, no. 6 (1998): 671. http://dx.doi.org/10.1071/bt97123.

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Fragmentation of the landscape by human activity has created small, isolated plant populations. Hakea carinata F. Muell. ex Meissner, a sclerophyllous shrub, is common in isolated fragments of vegetation in South Australia. This study investigated whether habitat fragmentation has caused restrictions to gene flow between populations. Gene diversity (HT = 0.317) is average for similar species but little is held within populations (HS = 0.168) and 46.9% of gene diversity is accounted for between populations. Estimates of gene flow are NM = 0.270 (based on FST) and NM = 0.129 (based on private alleles). Populations are substantially selfing (t = 0.111). Small isolated populations appears to be a long-term evolutionary condition in this species rather than a consequence of habitat fragmentation; however, population extinctions are occurring. Conservation will require the reservation of many populations to represent the genetic variation present in the species.

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23

Lamont, Byron B., Jens M. Olesen, and Peter J. Briffa. "Seed Production, Pollinator Attractants and Breeding System in Relation to Fire Response — Are There Reproductive Syndromes among Co-occurring Proteaceous Shrubs?" Australian Journal of Botany 46, no. 4 (1998): 377. http://dx.doi.org/10.1071/bt97008.

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The reproductive biology of two species pairs was compared, one member of which (Dryandra sessilis (Knight) Domin, Hakea erinacea Meissner) is susceptible to severe stress and disturbance by fire (nonsprouter) and stores few seeds in its crown, while the other (D. lindleyana Meissner, H. cristata R.Br.) is resilient (resprouter) and also stores most of its seeds for some years. It was hypothesised that the nonsprouter would have a high annual seed production associated with a suite of attributes directed towards that end (forming a reproductive syndrome), and that the resprouter would have the reverse properties. Over 30 attributes were assessed, covering putative pollinators, pollinator attractants and rewards, flower phenology, breeding system, and flower, fruit and seed production. Dryandra sessilis produced far more seeds than D. lindleyana, due to prolific flower production and a high fruit : flower ratio (associated with an effective outcrossing breeding system). Hakea erinacea produced significantly more seeds than H. cristata, which was attributable to its smaller fruits and exceptionally high fruit : flower ratio (associated with highly effective selfing). The correlation of seed production and fruit : flower ratio with susceptibility to fire was not supported by any consistent pattern among the other reproductive attributes.

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24

McLay, Todd G. B., Michael J. Bayly, and Pauline Y. Ladiges. "Is south-western Western Australia a centre of origin for eastern Australian taxa or is the centre an artefact of a method of analysis? A comment on Hakea and its supposed divergence over the past 12 million years." Australian Systematic Botany 29, no. 2 (2016): 87. http://dx.doi.org/10.1071/sb16024.

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Lamont et al. (2016) concluded that the Australian sclerophyllous genus Hakea (Proteaceae) arose 18million years ago in the South West of Western Australia (SWA) and dispersed 18 times to eastern (EA) and central Australia (CA) only 12million years ago (mid-Miocene). Their explanation of the biogeographic history of Hakea was based on the following: accepting a fully resolved molecular phylogenetic tree, although ~40% of nodes had posterior probability values below 0.95; using all nodes including geographically paralogous nodes to determine ancestral area probabilities; and applying a strict clock to estimate clade divergence times. Our re-analyses of the same dataset using a relaxed clock model pushes the age of Hakea to 32.4 (21.8–43.7) million years ago relative to its nearest outgroups, and the age of the divergence of two major clades (A and B) to 24.7 (17.2–33.7) million years ago. Calibration based on a new finding of Late Cretaceous fossil Banksia pushes these dates to 48.0 (24.3–75.2) million years ago and 36.6 (18.5–55.4) million years ago respectively. We confirm that each of the two main clades includes lineages in SWA, CA and EA. At the basal node of Clade A, two eastern Australian species form the sister group to three SWA scrub–heath–Eremaean species. These two groups together are sister to a large, mostly unresolved clade of SWA, CA and EA taxa. Similarly, at the base of Clade B is a polytomy of lineages from the SWA, CA and EA, with no resolution of area relationships. There is no evidence of a centre of origin and diversification of the genus is older than the mid-Miocene, being at least Oligocene, and probably older, although calibration points for molecular dating are too far removed from the ingroup to provide any great confidence in the methodology. Consideration should be given to the possibility of vicariance of multiple, widespread ancestral lineages as an explanation for lineages now disjunct between EA and SWA.

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25

Bartolozzi, Luca, Renzo Perissinotto, and Lynette Clennell. "Description of the female of Xiphodontus endroedyi Bartolozzi, 2005 (Coleoptera: Lucanidae)." Fragmenta Entomologica 51, no. 2 (November 15, 2019): 187–88. http://dx.doi.org/10.4081/fe.2019.365.

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The female of Xiphodontus endroedyi Bartolozzi, 2005 is described for the first time. The new locality record for this species shows that it actually has a wide distribution range across the Cape Floral Region, in the Fynbos Biome. Both larvae and adults were found boring into dead wood at the base of senescent trunks of a variety of Proteaceae species, including the alien invasive Hakea sericea.

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Domingues, Fernanda, Ângelo Luís, Luiza Breitenfeld, Susana Ferreira, and AnaPaula Duarte. "Antimicrobial, antibiofilm and cytotoxic activities of Hakea sericea Schrader extracts." Pharmacognosy Magazine 10, no. 37 (2014): 6. http://dx.doi.org/10.4103/0973-1296.127331.

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Green, P. S., Annette Wilson, Anthony E. Orchard, Helen S. Thompson, and Patrick M. McCarthy. "Flora of Australia. Volume 17B Proteaceae 3: Hakea to Dryandra." Kew Bulletin 55, no. 1 (2000): 254. http://dx.doi.org/10.2307/4117795.

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Groom, P. K., B. B. Lamont, and H. C. Duff. "Self-Crypsis in Hakea Trifurcata as an Avian Granivore Deterrent." Functional Ecology 8, no. 1 (February 1994): 110. http://dx.doi.org/10.2307/2390119.

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LYTOLLIS, W., R. T. SCANNELL, H. AN, V. S. MURTY, K. S. REDDY, J. R. BARR, and S. M. HECHT. "ChemInform Abstract: 5-Alkylresorcinols from Hakea trifurcata That Cleave DNA." ChemInform 27, no. 16 (August 12, 2010): no. http://dx.doi.org/10.1002/chin.199616121.

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30

Lee, Jessica, Hugh Finn, and Michael Calver. "Feeding activity of threatened black cockatoos in mine-site rehabilitation in the jarrah forest of south-western Australia." Australian Journal of Zoology 61, no. 2 (2013): 119. http://dx.doi.org/10.1071/zo12101.

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Land clearing threatens three black cockatoo species (forest red-tailed black cockatoo, (Calyptorhynchus banksii naso), Carnaby’s cockatoo (Calyptorhynchus latirostris), and Baudin’s cockatoo (Calyptorhynchus baudinii) endemic to south-western Australia, so revegetation is important to their recovery. Over three years we studied cockatoo activity in 7–14-year-old mine-site rehabilitation in the region’s jarrah (Eucalyptus marginata)–marri (Corymbia calophylla) forest to give the most detailed description to date of the use of rehabilitation by the birds. Pits varied floristically and structurally (despite similar rehabilitation prescriptions), but interior and exterior plots (100 m2) were similar within pits. Using feeding traces (e.g. chewed husks), and behavioural observations we confirmed feeding within eight years of revegetation. Plots containing feeding trace were similar to plots without, so factors determining black cockatoo feeding may not be apparent at small scales. Returning food resources reflected vegetation succession, with regenerating marri and fast-maturing proteaceous species providing most food. Carnaby’s cockatoo ate Banksia and Hakea seeds and Baudin’s cockatoo and the forest red-tailed black cockatoo consumed marri seeds. Banksia squarrosa, Hakea undulata, H. prostrata and marri were common foods in all years. Revegetation efforts elsewhere should consider these species, within the constraints of rehabilitation protocols addressing multiple aims.

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Peltonen, Sari. "Tuholaisten hallinta öljykasvien viljelyssä." Kasvinsuojelulehti 55, no. 3 (October 28, 2022): 13–17. http://dx.doi.org/10.54335/ksl.121749.

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Rypsin ja rapsin viljely on ollut Suomessa viime vuosina suurten haasteiden edessä. Kasvinsuojeluainevalikoiman kaventuminen ja suuret tuholaispaineet ovat luoneet epävarmuutta ja vähentäneet viljelyhalukkuutta, mikä on johtanut viljelypinta-alojen merkittävään laskuun. Lajikekehityksestä huolimatta myöskään öljykasvien satotaso ei ole käytännön viljelyssä noussut toivotulla tavalla. Vuosien 2020-2022 aikana toimineen RypsiRapsi 2025 -hankkeen (www.rypsirapsi.fi) tavoitteena on ollut hakea uusin viljelyteknisin keinoin parannusta öljykasvien viljelyvarmuuteen ja satoihin sekä löytää kemiallisen kasvinsuojelun rinnalle uusia ratkaisuja erityisesti tuholaisten hallintaan.

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32

Richards, Michael B., Philip K. Groom, and Byron B. Lamont. "A Trade-off between Fecundity and Drought Susceptibility in Adults and Seedlings of Hakea Species as Influenced by Leaf Morphology." Australian Journal of Botany 45, no. 2 (1997): 301. http://dx.doi.org/10.1071/bt96012.

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Successful seedling recruitment is vital for the persistence of fire-killed species in a community. Maximising seed and seedling production (fecundity) and the ability of adults and seedlings to survive summer drought are crucial in taking advantage of post-fire recruitment opportunities. In this study, the fecundity (seed and seedling production), mortality and water relations of fire-killed Hakea species with contrasting leaf morphologies (broad and terete) were examined over 2 consecutive years of exceptionally low rainfall at two sites, to investigate possible trade-offs between drought susceptibility (as influenced by leaf morphology) and fecundity of a species. Adult mortality was high in the broad-leaved species (H. smilacifolia Meissn. and H. undulata R.Br.) and low in terete-leaved species (H. erinacea Meissn., H. circumalata Meissn. and H. polyanthema Diels) with high transpiration rates (broad-leaved species) associated with greater plant death. Only H. smilacifolia had proportionally greater fecundity to compensate for high adult mortality. Seedling mortality increased proportionally with higher initial seedling : parent ratios (adult fecundity). Lowest mortality was for the terete-leaved species, apparently achieved by means of a combination of drought avoidance and tolerance mechanisms. Hakea undulata seedlings had the highest mean leaf area, but mortality was highest in H. smilacifolia. Thus, for seedlings, leaf morphology was not as strongly related to drought susceptibility as it was for adults.

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Schmidt, S., M. Mason, T. Sangtiean, and G. R. Stewart. "Do cluster roots of Hakea actities (Proteaceae) acquire complex organic nitrogen?" Plant and Soil 248, no. 1/2 (January 2003): 157–65. http://dx.doi.org/10.1023/a:1022352415728.

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Luís, Ângelo, Carla Cruz, Ana Paula Duarte, and Fernanda Domingues. "An Alkenylresorcinol Derivative from Hakea Sericea Fruits and their Antimicrobial Activity." Natural Product Communications 8, no. 10 (October 2013): 1934578X1300801. http://dx.doi.org/10.1177/1934578x1300801031.

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Hakea sericea has been introduced to Portugal for ornamental purposes. The phytochemical composition and the antioxidant, antibacterial, antibiofilm and cytotoxic properties of this shrub species have been previously reported. The present work describes the bioassay-guided fractionation of the crude methanolic extract of H. sericea fruits and the isolation of 9-(3,5-dihydroxy-4-methylphenyl)nona-3( Z)-enoic acid. The structure of this new compound was established by one- and two-dimensional NMR and IR spectroscopy, and high-resolution mass spectrometry. The antibacterial properties of the new alkenylresorcinol were studied by determining its MIC values against several strains of Gram-positive and Gram-negative bacteria using the resazurin microtiter assay. The new alkenylresorcinol inhibited the growth of Enterococcus faecalis, Listeria monocytogenes and Bacillus cereus with MIC values of 0.31, 0.02 and 0.16 mg/mL, respectively. Good MIC values were obtained against Staphylococcus aureus strains (0.005 – 0.16 mg/mL), including the clinical isolates (SA 01/10, SA 02/10 and SA 03/10) and MRSA strains.

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Larsen, Kai. "Flora of Australia Vol. 17B. Proteaceae 3: Hakea to Dryandra. 1999." Nordic Journal of Botany 19, no. 3 (July 1999): 270. http://dx.doi.org/10.1111/j.1756-1051.1999.tb01109.x.

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El-ahmir, Sh-hoob Mohamed, Sim Lin Lim, Byron B. Lamont, and Tianhua He. "Seed Size, Fecundity and Postfire Regeneration Strategy Are Interdependent in Hakea." PLOS ONE 10, no. 6 (June 2, 2015): e0129027. http://dx.doi.org/10.1371/journal.pone.0129027.

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Queirós, Carla S. G. P., Sofia Cardoso, Joana Ferreira, Isabel Miranda, Maria José V. Lourenço, and Helena Pereira. "Characterization of Hakea sericea Fruits Regarding Chemical Composition and Extract Properties." Waste and Biomass Valorization 11, no. 9 (September 27, 2019): 4859–70. http://dx.doi.org/10.1007/s12649-019-00818-3.

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Zolina, Anastasia, Steven Manchester, and Lina Golovneva. "Typification of the genus Zizyphoides Seward et Conway (Magnoliophyta, Trochodendraceae)." Acta Palaeobotanica 61, no. 2 (December 31, 2021): 123–35. http://dx.doi.org/10.35535/acpa-2021-0007.

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Type material of Paliurus colombii Heer, Populus arctica Heer, Hakea arctica Heer, and Hedera macclurii Heer from the Atanikerdluk locality (Paleocene, Greenland) was restudied based on the original collection, stored in the National Museum of Ireland, Dublin. All these species were joined under the name Zizyphoides colombii (Heer) Seward et Conway, type species of the genus Zizyphoides Seward et Conway. A lectotype of Zizyphoides colombii is designated and the diagnosis of this species is emended. An emended diagnosis of the genus Zizyphoides is also presented.

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Sluiter, Ian R. K., Andrew Schweitzer, and Ralph Mac Nally. "Spinifex–mallee revegetation: implications for restoration after mineral-sands mining in the Murray–Darling Basin." Australian Journal of Botany 64, no. 6 (2016): 547. http://dx.doi.org/10.1071/bt15265.

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Mineral-sands mining in the semiarid and arid zone of south-eastern Australia is now a widespread disturbance that may adversely affect large areas of remnant vegetation, including mallee (Eucalyptus spp.) with hummock grass or spinifex (Triodia scariosa) understorey. No broad-scale restoration projects have been undertaken to revegetate mallee Eucalyptus species with spinifex. We report on the survivorship and relative importance (spatial coverage) of hand-planted tubestock 10 years after establishment in 2001, which included mallee Eucalyptus, Triodia scariosa, Acacia spp. and Hakea spp. These taxa are the dominant plants in a semiarid dune–swale system on a former mineral-sands mine licence area in semiarid, north-western Victoria. Mean survivorship of tubestock was 0.58 ± 0.04. Spinifex (Triodia scariosa), needlewood (Hakea) and several mallee species (Eucalyptus spp.) survived substantially better than the average of all tubestock-planted species, although Acacia spp. had low survivorships. Although the plantings were undertaken in the early stages of the most severe drought in the instrumental record (the ‘Millennium drought’), several taxa survived well and species such as spinifex established and developed ground coverage greater than the benchmark values for the ecological vegetation class of the location. We conclude that hand-planting of tubestock can achieve restoration objectives for this component of spinifex–mallee vegetation, even under extremely arduous conditions associated with long-term drought. We also herald the importance of taking a long-term view to the assessment of revegetation success, in this case 10 years.

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York, Juliet, and Robert J. Whelan. "Post-fire Germination of Hakea sericea and Petrophile sessilis after Spring Burning." Australian Journal of Botany 46, no. 4 (1998): 367. http://dx.doi.org/10.1071/bt97075.

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Land managers are concerned about the season in which fire might be used as amanagement tool, in many ecosystems, yet there are few studies from whichresponses of plant populations might be predicted. Previous studies have beenmostly conducted in highly seasonal, Mediterranean-climate regions and thereis generally little replication of fires within a particular season. Findingsfrom these studies may be of limited value in ecosystems with weakly seasonalor non-seasonal climates, such as in the Sydney region. In this study, firebehaviour was quantified in three replicate fires in Hawkesbury Sandstonevegetation near Wollongong, New South Wales. Fires were conducted in spring1995, and seed germination of two Proteaceae species(Petrophile sessilis Sieber ex Schult. & Schult.f.and Hakea sericea Schrader) was followed for a yearafter fire. Fire intensity and patchiness varied substantially among the threesites, even though the fires occurred within a 2-week period, and the plantcommunities and fuel loads were similar. The timing of germination also varieda great deal among sites, occurring almost immediately after the fire at onesite but being delayed by nearly half a year at the other two. The amount ofgermination (but not the time course of germination) differed between thespecies: up to 70% of Hakea seeds had germinatedby week 44, whereas only around 5% of Petrophileseeds had germinated. There was also a variation in germination, especially ofPetrophile, within each site. It is concluded that, inthe Sydney region, the season of burning may not have a great impact on timingand amount of germination because rainfall is not strongly seasonal. Variationbetween sites and among years may therefore exceed variation between seasonsof burning.

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Barker, RM. "Towards a revision of the Hakea epiglottis Labill. (Proteaceae) complex of Tasmania." Papers and Proceedings of the Royal Society of Tasmania 124, no. 2 (1991): 79–84. http://dx.doi.org/10.26749/rstpp.124.2.79.

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LAMONT, BYRON, BRONWEN KEIGHERY, LINDA PENNY, and JOHN WALLACE. "A numeric, geographic and structural analysis of the Hakea falcata group (Proteaceae)." Botanical Journal of the Linnean Society 94, no. 4 (June 1987): 433–51. http://dx.doi.org/10.1111/j.1095-8339.1987.tb01060.x.

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Williams, P. A. "Hakea sericea: Seed production and role in succession in Golden Bay, Nelson." Journal of the Royal Society of New Zealand 22, no. 4 (December 1992): 307–20. http://dx.doi.org/10.1080/03036758.1992.10420824.

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Luís, Ângelo, Fernanda Domingues, and Ana Paula Duarte. "Bioactive Compounds, RP-HPLC Analysis of Phenolics, and Antioxidant Activity of Some Portuguese Shrub Species Extracts." Natural Product Communications 6, no. 12 (December 2011): 1934578X1100601. http://dx.doi.org/10.1177/1934578x1100601219.

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In the ecosystem of Serra Da Estrela, some plant species have the potential to be used as raw material for extraction of bioactive products. The goal of this work was to determine the phenolic, flavonoid, tannin and alkaloid contents of the methanolic extracts of some shrubs ( Echinospartum ibericum, Pterospartum tridentatum, Juniperus communis, Ruscus aculeatus, Rubus ulmifolius, Hakea sericea, Cytisus multiflorus, Crataegus monogyna, Erica arborea and Ipomoea acuminata), and then to correlate the phenolic compounds and flavonoids with the antioxidant activity of each extract. The Folin-Ciocalteu's method was used for the determination of total phenols, and tannins were then precipitated with polyvinylpolypyrrolidone (PVPP); a colorimetric method with aluminum chloride was used for the determination of flavonoids, and a Dragendorff's reagent method was used for total alkaloid estimation. The 2,2-diphenyl-1-picrylhydrazyl (DPPH) and β-carotene bleaching tests were used to assess the antioxidant activity of extracts. The identification of phenolic compounds present in extracts was performed using RP-HPLC. A positive linear correlation between antioxidant activity index and total phenolic content of methanolic extracts was observed. The RP-HPLC procedure showed that the most common compounds were ferulic and ellagic acids and quercetin. Most of the studied shrubs have significant antioxidant properties that are probably due to the existence of phenolic compounds in the extracts. It is noteworthy to emphasize that for Echinospartum ibericum, Hakea sericea and Ipomoea acuminata, to the best of our knowledge, no phytochemical studies have been undertaken nor their use in traditional medicine been described.

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Schmidt, S., and G. R. Stewart. "Glycine metabolism by plant roots and its occurrence in Australian plant communities." Functional Plant Biology 26, no. 3 (1999): 253. http://dx.doi.org/10.1071/pp98116.

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Soluble organic nitrogen, including protein and amino acids, was found to be a ubiquitous form of soil N in diverse Australian environments. Fine roots of species representative of these environments were found to be active in the metabolism of glycine. The ability to incorporate [15N]glycine was widespread among plant species from subantarctic to tropical communities. In species from subantarctic herbfield, subtropical coral cay, subtropical rainforest and wet heathland, [15N]glycine incorporation ranged from 26 to 45 % of 15NH4+ incorporation and was 2- to 3-fold greater than 15NO3- incorporation. Most semiarid mulga and tropical savanna woodland species incorporated [15N]glycine and 15NO3- in similar amounts, 18–26 % of 15NH4+ incorporation. We conclude that the potential to utilise amino acids as N sources is of widespread occurrence in plant communities and is not restricted to those from low temperature regimes or where N mineralisation is limited. Seedlings of Hakea (Proteaceae) were shown to metabolise glycine, with a rapid transfer of 15N from glycine to serine and other amino compounds. The ability to take up and metabolise glycine was unaffected by the presence of equimolar concentrations of NO3- and NH4+. Isonicotinic acid hydrazide (INH) did not inhibit the transfer of 15N- label from glycine to serine indicating that serine hydroxymethyltransferase was not active in glycine catabolism. In contrast aminooxyacetate (AOA) strongly inhibited transfer of 15N from glycine to serine and labelling of other amino compounds, suggesting that glycine is metabolised in roots and cluster roots of Hakea via an aminotransferase.

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Hyvönen, Eero. "Sammon taontaa semanttisessa webissä." Tekniikan Waiheita 39, no. 2 (June 25, 2021): 87–105. http://dx.doi.org/10.33355/tw.102864.

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Web koostuu miljardeista web-sivuista, joiden sisältöä voidaan hakea Googlen kaltaisilla hakukoneilla ja selailla linkkien avulla. Tämän ihmiselle näkyvän ”sivujen verkon” (Web of Pages) sisälle on rakentunut dataan perustava ”tiedon verkko” (Web of Data), semanttinen web. Se linkittää toisiinsa käsitteitä ja tietoa (dataa) tietokoneiden ymmärtämällä tavalla. Semanttisen webin kehittäminen käynnistyi toden teolla 20 vuotta sitten vuonna 2001 webin infrastruktuuria koordinoivan World Wide Web -konsortion (W3C) ja sen johtajan, webin ”isän” Tim Berners-Leen johdolla. Samana vuonna järjestettiin Suomessa konferenssi Semantic Web Kick-off in Finland ja ensimmäiset kotimaiset tutkimushankkeet käynnistyivät. Artikkelissa esitellään semanttisen webin idea, lyhyt kansainvälinen historia ja Suomessa tehtyä tutkimustyötä Aalto-yliopistossa ja Helsingin yliopistossa erityisesti digitaalisten ihmistieteiden saralla

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Wood, Alan R., and Alana Den Breeyen. "Incidence of gummosis disease in silky hakea under natural conditions in South Africa." South African Journal of Plant and Soil 38, no. 2 (March 15, 2021): 126–33. http://dx.doi.org/10.1080/02571862.2021.1879286.

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Dyer, C., and D. M. Richardson. "Population genetics of the invasive Australian shrub Hakea sericea (Proteaceae) in South Africa." South African Journal of Botany 58, no. 2 (April 1992): 117–24. http://dx.doi.org/10.1016/s0254-6299(16)30881-x.

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SHANE, M. W., C. SZOTA, and H. LAMBERS. "A root trait accounting for the extreme phosphorus sensitivity of Hakea prostrata (Proteaceae)." Plant, Cell and Environment 27, no. 8 (August 2004): 991–1004. http://dx.doi.org/10.1111/j.1365-3040.2004.01204.x.

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Breytenbach, G. J. "Alien Control: Can We Afford to Slash and Burn Hakea in Fynbos Ecosystems?" South African Forestry Journal 151, no. 1 (December 1989): 6–16. http://dx.doi.org/10.1080/00382167.1989.9630499.

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Journal articles on the topic 'Hakea'

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