Dissertations / Theses on the topic 'Male phenotype'
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Robertson, Kirsten 1975. "The reproductive phenotype of the male aromatase knockout mouse." Monash University, Dept. of Biochemistry and Molecular Biology, 2001. http://arrow.monash.edu.au/hdl/1959.1/8444.
Full textLindsay, Willow Rosella. "Hormonal regulation of male reproductive phenotype in a cooperatively breeding tropical bird." Pullman, Wash. : Washington State University, 2010. http://www.dissertations.wsu.edu/Dissertations/Spring2010/w_lindsay-042010.pdf.
Full textJackson, Natasha A. "Disruption of myo-inositol synthesis results in the "classic" Dosophila male sterile phenotype." Thesis, California State University, Long Beach, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=1603754.
Full textMyo-inositol is a six-carbon sugar alcohol. It is essential as a precursor of the phospholipid membrane component phosphatidylinositol (PI) and the phosphoinositide signaling pathway in all eukaryotes. It aids in cellular metabolism, osmoregulation, and plays an important role in fertilization and diseases such as diabetes, bipolar disorder, and Alzheimer’s disease. Myo-inositol metabolism is comprised of synthesis, transport, catabolism, and recycling. Myo-inositol synthesis is catalyzed by myo-inositol-3-phosphate synthase (MIPS). Surprisingly, synthesis of myo-inositol and its role in fertilization has not yet been studied in the model organism Drosophila melanogaster (fruit fly). We hypothesize that MIPS expression is essential for growth and development of D. melanogaster. In this study, a precise deletion of the entire MIPS gene was generated and confirmed through PCR amplification and sequencing of the resultant DNA fragments. The lack of the MIPS transcript in homozygous MIPS deletion flies was confirmed by RT-PCR. During that experiment, two additional isoforms of MIPS were identified in wild-type flies (CS). Supplementation of chemically defined food with 0.5mM inositol was required to sustain all homozygous MIPS deletion fly strains. Fully-grown homozygous deletion flies could live without additional inositol in the food, but newly emerged larvae only survived to the first instar larval stage. However, even while on rich media supplemented with 170mM inositol, a homozygous MIPS deletion stock was unable to produce viable offspring. Homozygous MIPS deletion strains were identified as male-sterile, incapable of producing offspring when mated to any strain of females (including wild-type). Homozygous female MIPS deletion flies were fertile and maintained a high fecundity rate when mated to any strain (with an exception of homozygous male MIPS deletion flies). The male-sterility was complemented with the addition of a wild-type MIPS gene to chromosome 3. Testes dissections of homozygous male MIPS deletion flies revealed improper progression of spermatogenesis, specifically during sperm individualization. These studies contribute to the understanding of the role of inositol synthesis in growth, development, and fertilization.
Coltman, David W. "Phenotype and mating success of male harbour seals, Phoca vitulina, at Sable Island, Nova Scotia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq24770.pdf.
Full textSmith, Joshua. "A Morphological, Functional, and Genetic Investigation of the Male Compound Eye Phenotype of Chrysomya megacephala (Diptera: Calliphoridae))." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/3060.
Full textValle, Andres Rojas. "Gone with the rain: negative effects of rainfall on male reproductive success in a nest-building arachnid." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/41/41134/tde-19092018-153915/.
Full textEm espécies que constroem ninhos, a sobrevivência da prole e o sucesso reprodutivo dos indivíduos parentais são fortemente influenciados pela localização e qualidade dos ninhos. Portanto, quantificar a influência das condições abióticas sobre a integridade dos ninhos é importante para prever os efeitos que a variabilidade climática pode ter na sobrevivência da prole e no sucesso reprodutivo dos pais. Neste estudo, investigamos como a chuva influencia a integridade dos ninhos e como a integridade dos ninhos influencia a atratividade masculina e o tempo de posse do ninho. Nossa espécie de estudo foi o opilião Quindina limbata, em que os machos constroem ninhos de barro em troncos caídos e protegem os ovos contra predadores e infestação por fungos. Nosso conjunto de dados é baseado em 12 meses de inspeções regulares de mais de 150 ninhos em uma floresta tropical na Costa Rica. Descobrimos que 43% dos ninhos foram destruídos pela chuva. A força de arrasto promovida pela chuva na superfície dos troncos caídos influenciou negativamente a integridade dos ninhos, diminuindo o perímetro da parede e a área do piso. A intensidade de cobertura de fungos não foi explicada pela posição do ninho ou pela precipitação. O tamanho corporal dos machos não influenciou o ganho de ovos, mas ninhos com alta integridade receberam mais ovos do que ninhos com baixa integridade. Curiosamente, ninhos com altos valores de cobertura de fungos receberam mais ovos. Por fim, a integridade dos ninhos e a cobertura de fungos não influenciaram o tempo de posse do ninho, mas a probabilidade de os machos abandonarem seus ninhos aumentou com o tempo em que não receberam ovos em seus ninhos. Considerando que temporais ocorrem durante todo o ano em florestas tropicais, os melhores machos devem selecionar locais protegidos para construção dos seus ninhos a fim de diminuir as chances de destruição promovida pela chuva. Locais protegidos podem manter a estrutura do ninho melhor preservada, melhorar a sobrevivência da prole, atrair mais fêmeas e, finalmente, aumentar o sucesso reprodutivo dos machos
Kwok, Kevin. "Experimental Studies of the Divergence of Pre- and Postcopulatory Phenotypes in Male Drosophila." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42123.
Full textMagris, Martina. "Phenotypic plasticity in male sexually selected traits in response to social cues." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3425756.
Full textIl successo riproduttivo dei maschi è fortemente influenzato dal loro investimento in costosi tratti sottoposti a selezione sessuale. Tuttavia, i vantaggi in termini di fitness di tale investimento sono spesso condizione-dipendenti e variano al variare di parametri demografici quali la sex ratio e la densità di popolazione. In ambienti variabili, l’abilità di adattare le decisioni riproduttive al contesto sociale è altamente vantaggioso. Ne risulta che i tratti selezionati sessualmente sono frequentemente caratterizzati da plasticità fenotipica. L’obiettivo del mio studio era articolato in tre parti. In primo luogo, ho lavorato per espandere l’attuale conoscenza nel campo della plasticità fenotipica di tratti sottoposti a selezione sessuale, sia tramite un approccio sperimentale, testando l’effetto della disponibilità di femmine sullo sforzo riproduttivo di maschi di Pisaura mirabilis, sia tramite un approccio teorico, cioè raccogliendo la letteratura disponibile sul tema degli aggiustamenti strategici della qualità dell’eiaculato. In secondo luogo, ho valutato costi e benefici dell’aumento di produzione spermatica osservato nei maschi di guppy come risposta alla percezione di opportunità di accoppiamento. Infine, ho indagato l’effetto di processi post-copulatori su fenomeni legati alla scelta del partner. Le due specie utilizzate nel mio studio, il guppy, Poecilia reticulata, e il ragno P. mirabilis, sono particolarmente adatti per studiare la plasticità fenotipica di tratti sotto selezione sessuale in quanto entrambi esprimono costosi tratti riproduttivi e subiscono fluttuazioni del loro ambiente socio-sessuale. Lo studio degli effetti della disponibilità di femmine sull’investimento maschile in tratti pre- e post-copulatori ha rivelato che i maschi di P. mirabilis non rispondono a variazioni in questo parametro. Nonostante essi non riducano l’investimento riproduttivo allocato al partner all’aumentare delle opportunità di accoppiarsi, potrebbero invece rispondere aumentando il proprio budget riproduttivo totale. L’esame della letteratura sulla plasticità della qualità dell’eiaculato, oltre a mostrare la varietà dei tratti soggetti ad aggiustamenti e dei fattori di stimolo, ha evidenziato la difficoltà di stimare le conseguenze per la fitness di questo tipo di risposte, a causa della complessità dei pattern di interdipendenza con tratti riproduttivi e non. Gli esperimenti che hanno indagato costi e benefici degli aggiustamenti strategici dell’eiaculato hanno mostrato che in guppy i costi della plasticità sono ridotti, se confrontati con i costi del fenotipo. Inoltre, il trade-off tra produzione spermatica e tratti pre-copulatori (il tasso di corteggiamento) sembra essere più marcato di quello tra numero e qualità degli spermi. Infine, i miei esperimenti sui processi post-copulatori in femmine poliandriche hanno evidenziato una precedenza spermatica del primo maschio e un vantaggio dei partner precedenti rispetto a quelli nuovi. Queste scoperte portano un importante contributo alla comprensione di fenomeni osservati nel contesto della scelta maschile del partner, quali la copia della scelta, l’effetto audience e l’effetto Coolidge. In conclusione, i risultati del mio studio mostrano come i trade-off tra tratti pre- e post-copulatori abbiano importanti effetti sui costi e i benefici della plasticità fenotipica di tratti riproduttivi, evidenziando l’importanza di adottare un approccio integrativo e di considerare vari tratti e la loro interazione nello studio della selezione sessuale. I miei risultati sottolineano anche la necessità di un’attenta valutazione di episodi di selezione post-copulatoria durante l’interpretazione di casi di plasticità nell’investimento sia pre- e che post-copulatorio.
Favati, Anna. "Social dominance and personality in male fowl (Gallus gallus domesticus)." Licentiate thesis, Stockholms universitet, Zoologiska institutionen, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-93019.
Full textMat, Jusoh Hanapi. "Investigation of phenotypic characterisation, metabolic profile and energy balance in male KLF3 knockout mice." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/12406.
Full textBracewell, Ryan R. "An Investigation of Postzygotic Reproductive Isolation and Phenotypic Divergence in the Bark Beetle Dendroctonus Ponderosae." DigitalCommons@USU, 2009. https://digitalcommons.usu.edu/etd/245.
Full textDonelson, Nathan Cooper. "Inter- and Intraspecific Variation in the Superfamily Pneumoroidea." Bowling Green State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1194043244.
Full textBa, Alhassane. "Hétérogénéité génétique des groupes sanguins au Mali : impact transfusionnel." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM5048/document.
Full textBlood group antigens may be responsible for alloimmunization and immuno-hemolytic accidents during transfusion or pregnancy. The transfusion of of sub-Saharan Africa populations is complex due to absence of high antigens expression, low antigens expression and partial antigens expression particularly for RH system.The study of blood group for transfusion of interest among donors in Bamako confirmed the effectiveness of multiplex genotyping strategy including polymorphisms calls to identify the rare donors, which permit access to phenotypes derived samples. In a second phase, the exploration of RH blood group system by sequencing among Dogon and Fulani in Mopti clearly shows that the allelic diversity and the frequency of some alleles RH depend on the ethnicity. A new haplotype RHD*DIVa/RHCE*ceTI(D2) combining an RHD*DIVa allele encoding a partial D antigen, potentially partial ce antigens, and a partial reactivity with anti-C, was identified among Dogon. In a third phase, the exploration of alleles encoding of the high and low frequency antigens in sub-Saharan Africa from East to West is an example of a study that clearly makes a difference between the populations of sub-Saharan African and those of Europe in terms of frequencies of alleles that define genetic diversity of one population compared to another. Thus, knowledge of ethnicity is more relevant than knowing the geographical origin in order to optimize transfusion in Saharan Africa and in European countries where some of these populations live. Guidelines strategic in relation with the local context have been identified for development of transfusion for next years in Mali
Goddard, Elizabeth. "An investigation of putative neurocognitive and social-emotional intermediate phenotypes in eating disorders : evidence from males and family trios." Thesis, King's College London (University of London), 2013. https://kclpure.kcl.ac.uk/portal/en/theses/an-investigation-of-putative-neurocognitive-and-socialemotional-intermediate-phenotypes-in-eating-disorders(d0a8afaa-986f-4ea6-aa58-04aebc3d048f).html.
Full textField, Kristin L. "Effects of sex ratio on ontogeny of sexual behavior and mating competence in male guppies, poecilia reticulata." The Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=osu1091578035.
Full textLange, Léa. "Influences environnementales précoces et plasticité phénotypique : étude d’un modèle amphibien avec soins parentaux prénataux, l’Alyte accoucheur." Thesis, La Rochelle, 2020. http://www.theses.fr/2020LAROS016.
Full textThe common Midwife toad (Alytes obstetricans) is a species of amphibian in which parental care is performed exclusively by the male. Indeed, after mating, during which the male actively helps the female for the emission of the eggs, he attaches the clutch around the joints of his hind limbs and thus carries it throughout embryonic development. Amphibians are very sensitive to the abiotic environment, especially to hydric and thermal conditions. To avoid extreme temperatures, they can behaviourally thermoregulate, for example by selecting refuges with favourable microclimatic conditions. The common Midwife toad has shown a selection of their refuges based on their hydric and thermal properties. The early stages of development are particularly sensitive to temperature. Parents can then carry out parental care to limit the effects. A paternal phenological effect has been observed in common Midwife toad, whose males favour higher temperatures when they carry eggs. Parental care is costly for adults, however. The common Midwife toad exhibited decreased locomotion performances during egg carrying, which could lead to decreased fitness. In addition, parental care strongly influences the development of young. The thermal environment encountered during the embryonic stage, and therefore during the period of parental care in the common Midwife toad, had both short-term and persistent effects on the phenology. The thermal environment encountered during the larval stage can also be decisive. In the common Midwife toad, the postnatal thermal environment induced a switch to multi-year development during development at 16 ° C, with overwintering at the tadpole stage, whereas it was annual during development at 20 ° C and 24 ° C. The postnatal thermal environment has also involved morphological, physiological, and behavioural changes. Finally, an involvement of physiology, and in particular heart rate, has been observed throughout the embryonic and larval development of the young
Maad, Johanne. "Selection and Floral Evolution in Platanthera bifolia and P. chlorantha (Orchidaceae)." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2002. http://publications.uu.se/theses/91-554-5226-4/.
Full textSoomro, Munawar Hussain. "Health effects of endocrine disruptors during pregnancy and childhood Exposure to heavy metals during pregnancy related to gestational diabetes mellitus in diabetes-free mothers Prenatal exposure to phthalates and the development of eczema phenotypes in male children: Results from the EDEN mother-child Cohort study." Thesis, Sorbonne université, 2019. https://accesdistant.sorbonne-universite.fr/login?url=http://theses-intra.upmc.fr/modules/resources/download/theses/2019SORUS243.pdf.
Full textAll humans are exposed to chemicals in everyday life, from food, indoor environment, cosmetics and other products that surround us at home and at work. Endocrine disruptors (EDCs) are man-made compounds that can bind to cell receptors and mimic or block the functions of natural hormones potentially resulting in adverse health effects. In recent years, hypotheses have been put forward that EDCs may contribute also to the development of allergic and respiratory diseases. In addition, it is likely that EDCs could act already during pregnancy by causing gestational diabetes mellitus and pregnancy induced hypertension, which may also trigger to develop hypertension and diabetes mellitus later in life. This dissertation provides evidence that maternal exposure to phthalates and heavy metals (Lead, Cadmium and Manganese) during pregnancy may be associated with gestational diabetes mellitus, pregnancy induced hypertension and later eczema/atopic dermatitis in children. We used ongoing French EDEN-mother child cohort data for our three studies. Our results add new suggestive evidence on the relationship between EDCs (phthalates and heavy metals we studied) and maternal and children health, that prenatal exposure to certain phthalates and heavy toxic metals may play a role in the development of gestational diabetes mellitus and pregnancy induced hypertension during pregnancy and later eczema in early childhood. Future research focusing on larger populations and addressing multiple exposures assessed prenatally and postnatally are required to provide more evidence on possible contributions of emerging pollutants to study the role of phthalates and heavy metals
Garraud, Claire. "Evolution de la gynodioécie-gynomonoécie : approches expérimentales chez Silene nutans & approche théorique." Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00668797.
Full text"Natural and Sexual Selection Shape the Acoustic Phenotype of Urban Birds." Tulane University, 2017.
Find full textAnthropogenic noise is an evolutionarily recent phenomenon and many animals respond by changing the pitch and timing of their vocalizations to avoid masking. A benefit to modifying a vocal mating signal in the context of noise is increased transmission distance. This same modification may pose a fitness cost if that signal feature is also sexually selected. Bird song is a well-studied sexual signal used in territory defense and mate attraction. Physically difficult to produce components of song are thought to be honest signals of male quality. One such trait is a male's ability to maximize the rate of note production at a given frequency bandwidth; this tradeoff is known as vocal performance. Studies have shown modifications to song in the context of noise, specifically to trill rate and bandwidth. Costs of these modifications may include increased conflict with neighboring males, which could potentially lead to decreased body condition, loss of a territory, or less time spent attracting a female. Few studies have investigated this tradeoff between environmentally induced selection (i.e. natural selection) and social selection (i.e. sexual selection) on song in an urban landscape. Therefore, a gap remains in our knowledge of the consequences on fitness of urban song adaptation for signalers. Using the white-crowned sparrow (Zonotrichia leucophrys) in the San Francisco Bay Area of California, the objectives of my dissertation research include 1) testing if vocal performance is a salient signal for white-crowned sparrows, 2) testing if receivers are responding specifically to variation in trill rate or bandwidth, and 3) testing the effect of ambient noise level on receiver assessment of vocal performance. Overall, my dissertation research suggests that both anthropogenic and natural soundscapes shape the evolution of song and receiver behavior. Modifications to song structure that increase signal detection come at the cost of decreased signal salience for male competitors. Additionally, anthropogenic noise appears to change how males utilize vocal performance. Therefore, species living in noisy areas may face consequences of decreased fitness over time due to masked honest signals and increased male-male conflict.
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Jennifer N. Phillips
CAPPA, FEDERICO. "The male phenotype in Polistes dominula: sexual selection and host-parasite interactions." Doctoral thesis, 2013. http://hdl.handle.net/2158/864100.
Full textChambers, Caitlin. "The impact of the environmental hazard, acrylamide, on the male reproductive tract and transgenerational phenotype." Thesis, 2020. http://hdl.handle.net/1959.13/1411236.
Full textThe impact of exposure to environmental hazards on personal health and the health of our offspring has become of great importance over recent decades. The effect of gestational exposures across generations have been widely investigated, but what is less well understood is the impact of paternal preconception exposure. The research presented utilised the environmental hazard, acrylamide as a model to facilitate a greater understanding of paternal preconception exposure, and the multi- and transgenerational consequences. Throughout this research, the effect of acrylamide on the male reproductive tract was investigated, following single and multigenerational exposures, and the importance of the enzyme CYP2E1, known to modulate acrylamide-toxicity. CYP2E1 is a P450 metabolising enzyme, localised to the endoplasmic reticulum and/or the mitochondria throughout various tissues of the body, including in the pachytene spermatocytes of the testis and epithelial cells of the epididymis within the male reproductive tract. It was hypothesised that acrylamide would alter CYP2E1 protein abundance and DNA fragmentation in the male reproductive tract, and multigenerational exposure of the male germline would result in altered phenotypes in progeny. An in vivo acute exposure model and in vitro cell culture were utilised to establish the effect of acrylamide on CYP2E1 in the male reproductive tract. Prior to the examination of acrylamide exposures, we performed immunoblotting analysis of CYP2E1 and optimisation of subcellular fractionation techniques to isolate and purify the components of the cell that harbour CYP2E1. Mitochondrial fractions from liver tissue were extracted and purified, while microsomal fractions from the endoplasmic reticulum require further optimisation, and thus this technique was not utilised for further analyses. From the in vivo and in vitro exposure regimes it was determined that acrylamide increased the abundance of CYP2E1 in the spermatocytes of the testis (150% of vehicle) and mECap18 cells (130% of vehicle) and elevated DNA fragmentation in both the mECap18 cells (120% of vehicle) and mature spermatozoa (≥120% of vehicle). To postulate potential mechanisms of this induction comparison to the well-characterised CYP2E1 substrate ethanol was performed. Ethanol exposure also elevated CYP2E1 abundance in spermatocytes (130% of vehicle) and the mECap18 cells (150% of vehicle), in addition to Cyp2e1 transcript expression in the mECap18 cells only (≤500% of vehicle). To model environmental multigenerational exposure, a chronic regime of acrylamide exposure at a human-relevant dose following the paternal germline was employed. Paternal and grand-paternal acrylamide exposure modified the response to acrylamide in male offspring with significantly altered DNA fragmentation in mature spermatozoa and CYP2E1 abundance in spermatocytes with or without acrylamide exposure of the progeny. Additionally, acrylamide exposure at the human-relevant dose of ≈0.2 mg/kg bw/day resulted in the transgenerational phenotype of decreased testis to body weight ratio in the male F2 progeny following ancestral exposure to acrylamide (75-80% of unexposed lineage). The experiments outlined herein demonstrate novel understanding of acrylamide and its effects on the male reproductive tract, and the impact of preconception exposure to the reproductive health of multiple generations. These data provide new insight into the transgenerational impact of an environmental hazard at under a human-relevant regime, following paternal preconception exposure, to expand our understanding of environmental health.
Krishnan, Sudha. "TRAF-interacting protein, an inhibitor of the canonical nuclear factor-κB pathway, plays a key role in the estradiol -dependent apoptosis of the dual-phenotype gamma amino butyric acid/glutamate neurons in the anteroventral periventricular nucleus of the male rat." 2008. https://scholarworks.umass.edu/dissertations/AAI3329955.
Full textRasmussen, M., Y. Li, S. Lindgreen, J. S. Pedersen, A. Albrechtsen, I. Moltke, M. Metspalu, et al. "Ancient human genome sequence of an extinct Palaeo-Eskimo." 2010. http://hdl.handle.net/10454/6149.
Full textWe report here the genome sequence of an ancient human. Obtained from approximately 4,000-year-old permafrost-preserved hair, the genome represents a male individual from the first known culture to settle in Greenland. Sequenced to an average depth of 20x, we recover 79% of the diploid genome, an amount close to the practical limit of current sequencing technologies. We identify 353,151 high-confidence single-nucleotide polymorphisms (SNPs), of which 6.8% have not been reported previously. We estimate raw read contamination to be no higher than 0.8%. We use functional SNP assessment to assign possible phenotypic characteristics of the individual that belonged to a culture whose location has yielded only trace human remains. We compare the high-confidence SNPs to those of contemporary populations to find the populations most closely related to the individual. This provides evidence for a migration from Siberia into the New World some 5,500 years ago, independent of that giving rise to the modern Native Americans and Inuit.
Gonçalves, Joana Catarina Pereira Meireles. "A genetic study of male infertility centered in semen hyperviscosity and asthenozoospermia phenotypes." Master's thesis, 2017. https://hdl.handle.net/10216/110703.
Full textGonçalves, Joana Catarina Pereira Meireles. "A genetic study of male infertility centered in semen hyperviscosity and asthenozoospermia phenotypes." Dissertação, 2017. https://hdl.handle.net/10216/110703.
Full textHong, Teh-Sen, and 洪得森. "Influence of Temperature in the Phenotypic Expression of Gene-cytoplasmic Male Sterility of Pepper (Capsicum annum L.)." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/87161278492817650638.
Full text國立屏東科技大學
熱帶農業暨國際合作研究所
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Under different temperature regime (30/25℃, 28/20℃, 25/18℃, 20/18℃, 20/12℃; day/night), gene-cytoplasmic male sterility ‘Acc. 195’ plants had greater vegetative growth than that of its normal maintainer lines. Except for the carotenoid contain, plant height, internode length, leaf area, and chlorophyll contain except for the carotenoid contain in the CMS plant were significantly larger than the normal plant. ‘Acc. 14’ and ‘Acc. 17’ plants under 28/20℃ day/night treatment showed abundant growth than their own normal isogenic maintainer. However, under 25/18℃ day/night temperature regime ‘Acc. 17’ plant could set fruits and its anther could produce normal viable pollen grains with numbers showed no significant difference to those of normal maintainer line. There was also no significant difference in plant growth character between the recovered ‘Acc. 17’ plants and its normal maintainer plants. ‘Acc. 17’ plants treated seedling established in summer and treated with 25/18℃ day/night temperature regime at anthesis of the first branch, the recovering fertility temperature regime only react on branch with non-visible bud and make the original male sterile plant fertile. According to cytological microsporogenesis observation recovering temperature regime must be present in archesporial cell stage or the earlier primordial stamen differentiation stage. When under 28/20℃, anther showed the degeneration delaying and vacuolate tapetum encroaching on the tetrad caused the collapes of developing microspores. While in that under 25/18℃, tapetum developed normally and the microspores could release from tetrad to form normal pollen grains. Analysis on the expression of male fertility in different ‘Acc. 17’ generations indicated that: The expression of male sterility of F1 generation and BC1F1 generation were unstable and related to the air temperature regime about twenty days before the anthesis of pepper flower. Cool air temperature regime (25/18℃) increased the expression of male fertility; while hot air temperature regime (28/20℃) caused plants to be sterile. Nevertheless, ‘Acc. 17’ F2 generation showed segregation of total male fertile, total male sterile and unstable male sterile (fertile) plants which fit χ2 ratio of 9:3:4. It assumed that the genetic control of the unstable sterility (fertility) was by two major epistasis recessive genes.