Assessment of genetic variability of chilli in Western Himalayan Region

Aim: The present study was conducted with the aim to collect and evaluate the available genetic diversity of chilli (Capsicum annuum L.) in order to identify promising accessions for cultivation as well as use in crop improvement. Methodology: A total 78 accessions of chilli were collected from Western himalayan region, i.e., Kashmir valley of India. Collected germplasm was evaluated at one location for fifteen quantitative traits of horticultural importance. Results: With ample diversity in these traits, a high coefficient of variation was found. Principal Component Analysis (PCA) revealed that first five principal components possessed eigen value > 1, cumulatively contributed > 65.2 percent of total variability. All the genotypes were grouped into five clusters showing non parallelism between geographic and genetic diversity. Interpretation: The genotypes grouped in different clusters may be utilized for hybridization programme to produce more heterotic recombinants.

Behavioral genetics of Drosophila ananassae

Drosophila ananassae has a unique status among Drosophila species because of certain peculiarities in its genetic behavior. The most unusual feature of this species is its relatively high frequency of spontaneous male recombination. The results of studies on non-sexual behavior, such as phototactic responses, eclosion rhythm, and preferences for oviposition and pupation sites, lead us to suggest that this behavior is under polygenic control, with a substantial amount of additive genetic variation. Sexual isolation has been reported in D. ananassae with the degree of such isolation being stronger in isofemale lines than in natural populations. The significant variations seen in the mating propensity of several isofemale strains, inversion karyotypes and wild type strains, the diminishing effects of certain mutations on the sexual activity of males, and the positive responses to selection for high and low mating propensity point to a genetic control of sexual behavior in D. ananassae. Males contribute more to variation and thus are more subject to intrasexual selection than females. There is a positive correlation between sternopleural bristle number, mating propensity and fertility in D. ananassae. This correlation between morphometric traits and mating success suggests that larger flies are more successful in mating than smaller ones. There is also evidence for adaptive plasticity and a trade-off between longevity and productivity in D. ananassae. Rare, specific courtship song parameters that provide males with a mating advantage have also been reported in different geographic strains of D. ananassae. The remating behavior of males and females, sperm displacement, and the bi-directional selection for female remating speed indicate that post-mating behavior in this species may also be under genetic control. The occurrence of size assortative mating further indicates that there is size-dependent sexual selection in D. ananassae

Biochemical and bacteriological study of urinary calculi.

Biochemical and bacteriological study of urine, nidus and chemical analysis of 100 calculi from 100 patients admitted in the Regional Institute of Medical Sciences, Imphal from November, 1997 to October 1999 were done. About 47% of the cases had positive urine culture and nidus culture. Escherichia coli was the commonest bacteria isolated both in the urine and nidus of calculi. The commonest radical present in the calculi was calcium while the rarest was uric acid. The stones were composed mainly of calcium oxalate and/or phosphate followed by struvite, then mixed stone.

Mating activity and fitness of a few wild type strains of Drosophila ananassae.

Courtship time, duration of copulation and fertility were tested in six wild type strains of D. ananassae originating from different geographical localities. The results indicate that there is significant variation among the strains tested with respect to courtship time, duration of copulation and fertility. The strains showing a longer duration of copulation produce more progeny. These findings suggest that there is a positive correlation between duration of copulation and fertility in D. ananassae.

Risk behaviour in an urban and a rural male adolescent population.

BACKGROUND: There is an increasing trend of risk behaviour in adolescents worldwide but very little literature is available in India on this important subject. We surveyed an urban male adolescent population and a comparable rural population to determine the difference in their risk behaviour. METHODS: A comparative cross-sectional study was conducted among 199 and 152 male adolescents from an urban village of south Delhi and a rural village in Uttar Pradesh. A pretested semi-structured interview schedule with 36 items was applied on all subjects by trained interviewers. RESULTS: Consuming alcohol, smoking, pre-marital sexual intercourse and consuming bhang (cannabis) were present in 32.2%, 25.1%, 12.5% and 11.5% of the urban village adolescents and in 1.3%, 48.7%, 11.2%, and 16.5% of those residing in the rural village, respectively. About 66.8% of urban and 51.3% of rural adolescents had indulged in physical fights and 12.5% of urban and 6.6% of rural adolescents were in possession of assault weapons such as iron rods, chains or knives sometime in the 30 days prior to the interview. CONCLUSION: The results of our study indicate that there is a high prevalence of risk behaviour in both urban and rural adolescents. However, except for smoking which was more common amongst rural adolescents all the other risk behaviours were more in those residing in urban areas. The reasons for this need to be ascertained, taking the geographical and socio-cultural factors into account, prior to considering the introduction of behaviour modification programmes.