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RISS 인기검색어
- 검색키워드
- 저자 : Yenisetti, Sharat Chandra (검색결과 3 건)
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Remating in a Drosophilid : Phorticella striata
Yenisetti, Sharat Chandra,Hegde, Shridhar Narayan 한국유전학회 2002 Genes & Genomics Vol.24 No.2
Remating is common in males and females of many species of Drosophila. Reproductive success in male organisms is limited by the number of females he can inseminate and the ability to produce more eggs in case of females. The phenomenon of remating by females is a prerequisite for the occurrence of sperm competition between males. Phorticella striata is a drosophilid insect discovered from Karnataka, India. Male and female remating were observed in two mass culture stocks raised from flies collected from Mysore and Ahmadabad. Study revealed that in male Phorticella variation in remating frequency, mean matings between two populations was insignificant. Variation in mating durations for different matings in both the strains was also insignificant. However, significant inter-strain mating duration variations for the first four coatings were observed. Variation in female remating latency between the populations was found statistically insignificant. Insignificant variation was observed for the duration of copulation between the first and second matings in Mysore population. However, remating duration was significantly shorter in Ahmadabad population. Observed inter-strain variations can be attributed to geographic isolation which may lead to 'response variation' of the genetic system of a species to different physical environments.
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Relationship between Mating Success and Wing Length in a Drosophilid: Phorticella striata
Sarat Chandra Yenisetti,Sreedhara Narayana Hegde,Mididoddi Venkateswarlu 한국유전학회 2008 Genes & Genomics Vol.30 No.1
Correlative studies were made between mating success and wing length in a drosophilid insect Phorticella striata. Mating latency (time elapsed until mating from introduction) noted for all the matings. Observations were made for one hour considering number of pairs mated in every 15 minutes as one group. Mating latency of the flies gradually increased from 0-15 min to 45-60 min. Data showed that difference in mean number of flies mated during different time intervals was significant, but the difference was non-significant between age groups, suggesting age has no influence on mating latency. Males mating in the first fifteen minutes (0-15 min) time interval had significantly longer wings. In females also there was significant difference in wing length that mate in different time intervals. Females mating in the first thirty minutes (0-30 min) bear significantly longer wings when compared with those that mate during 31-60 min. This showed large flies mate early in both the sexes. Thus the present study shows a direct relationship between wing length and mating success. So there is sexual selection acting on body size.
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Sarat Chandra Yenisetti,Sreedhara Narayana Hegde,Mididoddi Venkateswarlu,Mysoru Siddaiah Krishna 한국유전학회 2006 Genes & Genomics Vol.28 No.4
Phenotypic plasticity is the capability of a genotype to produce different phenotypes in different environments. The effects of changes in ambient temperature on reproductive fitness traits such as mating latency, copulation duration and mating success were studied in the Mysore and Ahmedabad populations of Phorticella striata at four ambient temperatures: - 15℃, 22℃, 29℃ and 36℃. Between the two populations the difference in mating latency was insignificant. However, the difference in copulation duration was significant between the two strains. The differences in mating latency and copulation duration at the four temperatures were also significant. Both populations exhibited long mating latency and short copulation duration at 15℃ and short mating latency, long copulation duration at 22℃ and 29℃. At 36℃ flies did not mate at all. The greatest mating success (%) was observed at 22℃ in both the Mysore and Ahmedabad populations. At 15℃, and 29℃ mating success was low. Chi-square test showed that the difference in mating success between the two populations was insignificant at different temperatures. Mating latency, copulation duration and mating success are independent events in the sexual process. These traits need not be expressed similarly by the same species under different situations. Thus, the present study heralds the phenotypic plasticity of sexual behavioral traits under various ambient temperatures. Our findings strengthen the support for the adaptive nature of temperature - mediated plasticity in sexual behavior.
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