Comparative performance of four types of testers for evaluating corn inbred lines from two populations
1986
Md Liakat Ali | Tepora, N.M. (Central Luzon State Univ., Munoz, Nueva Ecija (Philippines). Inst. of Graduate Studies)
Four types of testers, an open-pollinated variety, a three-way cross hybrid, a single cross hybrid and an inbred line, were used to evaluate the combining ability of 19S4 generation inbred lines extracted from two populations of corn (Zea mays L.). The inbred lines were evaluated for nine quantitative characters. Out of four testers, the inbred tester, Ph 109-1, had the narrowest genetic base and lowest yield potential but gave a highly significant and maximum genetic variation in the testcross progenies for most of the characters studied. Thus, it is the most effective tester for evaluating the inbred lines. Both additive and nonadditive types of genes action were operative in the genetic control of the nine characters studied. Additive gene action was more important in contributing to the inheritance of0991days to tasseling, day to silking and plant height while nonadditive gene action was more important for ear length, ear diameter, number of kernel rows per ear, number of kernels per ear, weight of 1000 grains and grain yield. Two inbred lines were identified as the potential inbred lin
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