Articles

Genetic behavior for kernal yield and its physio-agronomic attributes in maize at normal and high temperature regimes


Abstract


Cell membrane thermostability and seedling plant biomass were used to select suitable parents for hybridization against high temperature stress from 77 inbred lines. Six diverse parents with respect to high temperature stress tolerance viz; two high temperature tolerant (935006, R2205-5-4), two moderately tolerant (F-165-2-4, F101-7-2-6) and two high temperature susceptible maize inbred lines (F113-1-1-1 and R2304-2) were selected and crossed in a full diallel fashion to evaluate inheritance pattern of physio-agronomic traits. Data regarding physiological traits viz., osmotic potential, transpiration rate, growing degree days (GDDs) to 50% tasseling and agronomic traits viz; number of kernels plant-1 and kernels yield plant-1recorded were at normal and high temperature stress regimes. Analysis of variance revealed highly significant variation (P < 0.01) for all the traits studied except osmotic potential at normal temperature regime which was significant at P < 0.05. Transpiration rate, growing degree days to 50% tasseling, number of kernels plant-1 and kernel yield plant-1 showed partial fitness of the data either at normal or higher temperature regime while osmotic potential showed partial fitness of the data by regression analysis in both temperature regimes. Genetic components of variance and Wr/Vr graph for traits studied depicted preponderance of over dominant gene action except osmotic potential at normal temperature regime which reflected additive gene control at normal temperature regime. High temperature stress modified gene expression in most of polygenic traits.

Keywords

Over dominant and complete dominant gene effects, physio-agronomic traits, global warming and maize kernel yield improvemen

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Maydica - A journal devoted to maize and allied species

ISSN: 2279-8013