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Item Heterosis of growth characters and earliness in Snakegourd (Trichosanthes anguina L.)(Kerala Agricultural University, 1993) Philip Varghese; Rajan, SHeterosis of growth characters and earliness in snakegourd was worked out in a 13 x 13 analysis. Heterobeltiosis and standard heterosis were found for main vine length, primary branches per plant, days to first male flower anthesis, days to first female flower opening, fruiting nodes on main vine, days to fruit maturity and days to first f r u i t picking maturity. Days to first female flower opening showed high heterobeltiosis in parental combinationsTA 102xTA 41, TA 77xTA 41 and TA87xTA30. The crosses TA 77 xTA 55, TA 89 xTA 19,TA89xTA 102andTA77xTA 99 were highly heterobelliotic for days to first fruit pickig maturity and in crosses TA 100 x TA 82, TA 77 x TA 99, TA 77 x TA 41 and TA 30 x TA 99, standard helerosis was high for this trait.Item Genetic variability and heritability studies in snakegourd (Trichosanthes Anguina L.)(Kerala Agricultural University, 1993) Philip Varghese; Rajan, SGenetic variability and heri lability parameters were studied in48snakegourd accessions. The genotypic coefficient of variation was high for f r u i t i ng nodes on main vine, male flowers/plant, sex ratio, fruits/plant and crude fibre content. The heritabilily was high for total duration of the crop and crude protein content of the f r u i t . Male flowers/plant, sex ratio, fruiting nodes on main vine and fruits/plant exhibited high heritability and high genetic gain indicating additive gene action. Yield/plant, fruit length, total crop duration, days to first harvest and days to first male flower anthesis exhibited high heritability and low genetic gain which indicate nonadditive gene action including epistasis and dominance pointing towards heterosis breeding for high yields and earliness.