Wagh, R. S.Sangita Bhausaheb Pawar2021-01-082021-01-082017https://krishikosh.egranth.ac.in/handle/1/5810159467The investigation on “Growth and yield responses in cowpea (Vigna unguiculata (L.) Walp) genotypes under vayring thermal regimes,” was conducted at Phytotron facility, M.P.K.V., Rahuri, Dist. Ahmednagar (Maharashtra) during Rabi, 2015-16. The experiment was laid out in a Factorial Completly Randomized Block Design with two replications involving fourteen cowpea genotypes. The data on various germination tests, seedling growth tests, morpho-physiological parameters were recorded periodically while, yield and yield contributing characters were recorded at harvest. The data was analysed statistically by Factorial Completely Randomized Block Design (FCRD). Significant differences were observed in respect of all the parameters recorded in fourteen cowpea genotypes at alltemperature regimes. Studies were carried out on germination indices viz; germination percentage, promptness index, vigour index, germination rate index, mean germination time, germination index, coefficient of germination velocity, germination stress index, shoot length stress tolerance index, root length stress tolerance index, seedling length stress tolerance index and dry matter stress tolerance index. Seedling indices like plant height stress tolerance index, root length stress tolerance index, seedling length stress tolerance index, dry matter stress tolerance index and relative saturation deficit were computed. Morpho-physiological parameters like days to initiation of flowering, 50 per cent flowering and physiological maturity, photosynthetic rate, stomatal conductance, transpiration rate, chlorophyll content index, plant height, number of branches per plant, leaves per plant, leaf area per plant, pods per plant, seeds per pod, seeds per plant, seed yield per plant, biomass per plant and harvest index were recorded. Temperature regime 30/250C suited best for all morpho-physiogical and yield contributing characters. It was observed that 30/250C temperature favoured better germination percentage, promptness index, coefficient of germination velocity, dry matter production and other indices. While 35/300C temperature regime showed increase in shoot length, seedling length and consequently all seedling indices. Moderate day and night temperatures (25/200C) were found suitable for root growth and root length stress tolerance indexEnglishThesis