PG Thesis
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Item Estimation of genetic parameters in green gram (Phaseolus aureus Roxb.)(Department of Agricultural Botany, College of Agriculture, Vellayani, 1980) Presanna Kumari, K T; Mary K GeorgeBiometric studies on fifteen divergent green gram varieties (Phaseolus aurreus Roxb. syn. Vigna radiata (L.) wilzeck.) was conducted at the College of Agriculture , Vellayani , during November- January, 1979-80, to estimate the important genetic parameters like mean, range, genotypic and phenotypic coefficientsof variation , heritability, genetic advance and genetic gain and to find out the direct and indirect contributions of various component characters on yield by path coefficient analysis. There were significant differences among the varieties for all characters studied. Genotypic coefficient of variation was maximum for number of branches per plant followed by 100 seed weight and minimum for days to 50 per cent flowering . High heritability estimates were observed for pod length , 100 seed weight, plant height, number of seeds per pod days to 50 per cent flowering and number of pods per plant. Genetic gain was maximum for number of branches per plant followedby 100 seed weight and minimum for days to 50 per cent flowering. The number of branches per plant 100 seed weight, number of pods per plant and pod length had high heritability and genetic gain indicating the presence of additive gene action and hence they can be relied upon in selection programmes.Item Selection index in horse gram (Dolichos biflorus L.)(Department of Agricultural Botany, College of Agriculture, Vellayani, 1980) Suraiya, D; Mercy, S TThe present biometric study was carried out in the College of Agriculture, Vellayani during the year 1979-80 with fifteen varieties of horse gram (Doliches biflorus L.) to formulate a suitable selection index for yield. The observation plants were studied individually for the following characters. (1) Seed yield per plant (2) Number of pods per plant (3) Number of seeds per pod (4) 100-seed weight (5) Pod length (6) Days to 500 flowering (7) Height of plant (8) Number of branches (9) Days to maturity (duration). The data obtained in the study were subjected to statistical analysis viz. estimates of mean for all the different varieties, analysis of variance in respect of the nine selected characters, estimates of components of variances, genotype, environmental and phenotypic coefficients of variations, heritability, genetic advance and studies of discriminant function and path coefficient analysis.Item Biometrical studies in banana(Department of Agricultural Botany, College of Horticulture, Vellanikkara, 1982) Rosamma, C A; Narayanan Namboodiri, K MStudies were undertaken with forty eight banana varieties belonging to five different genomic groups at the Banana Research Station, Kannara and Department of Agricultural Botany, College of Horticulture, Vellanikkara during 1981-82 to estimate the extent of genetic variability, association among the selected characters and its partition into direct and indirect effects through path coefficient analysis. Selection indices were worked out to estimate the efficiency of selection through discriminant function over straight selection or vice versa.Item Divergence studies of salad cucumber (Cucumis sativus L)(Department of Olericulture,College of Horticulture, Vellanikkara, 2006) Smitha Sara Abraham; Gopalakrishnan, T RThe present investigation on “ Divergence studies in salad cucumber (Cucumis sativus L)” was conducted at College of Horticulture, Vellamkkara, Thrissur during December 2005- April 2006. Twenty-eight salad cucumber genotypes collected from different parts of India were utilized for the study. The extent of variability, correlation between yield and its component characters, path analysis and divergence among 28 genotypes were assessed. The 28 genotypes were significantly different for 15 characters studied. The genotype Phule Himangi (20.22 kg/plot) emerged as high yielder followed by AAUC 2 (15.11 kg/plot). Selection of plants based on yield/plot was observed to be efficient than selection of component characters. All the accessions were prickled on the surface. All were monoecious and produced yellow flowers. Most of the genotypes produced light green fruits whereas Phule Himangi produced white stout fruits. Genotypes CS 25 and CS 35 were comparatively free from biotic factors except mosaic and serpentine leaf miner. Total yield per plot showed positive correlation with fruits per plant, duration of crop and number of harvests. Negative correlation was observed between total yield per plot and number of branches. It is clear from the study that, for obtaining higher yield characters like fruits per plant, duration of crop, number of harvests etc should be considered in the selection programme. Fruits per plant had maximum positive direct effect on total yield per plot. Higher positive effects for days to first male flower anthesis was observed on total yield per plot. The genotypes were grouped into 5 clusters based on Mahalanobis D2 statistics. Cluster I, II, HI, IV and V contained 13,8,4,2,1 genotypes respectively. Intercluster distance was maximum between cluster II and V (48733.77) and minimum between cluster I and III (8415.55). Cluster V showed maximum average inter-cluster distance with any another cluster.Item Genetic variability and correlation studies in winged bean [Psophocarpus tetragonolobus(L) DC](Department of Olericulture, College of Horticulture, Vellanikkara, 1984) Ancy Philip; Ramachandran Nair, SItem G x E interaction of semi- erect cowpea genotypes(Department of Olericulture, College of Horticulture, Vellanikkara, 2005) Ampily, M; Salikutty Joseph