Combining ability analysis was conducted using line x tester design in maize inbred lines for yield and yield contributing traits. The sca variance was observed to be more important for all the traits studied. The inbreds DMR-201, CM-119 and CM-121 were good general combiners for grain yield per plant and most of their yield contributing traits. The cross CM-121 x DMR-201 showed high sca effects and heterosis for grain yield and early maturity and thus, can be tested over the locations for assessing its consistent performance over the wide range of environments. Other crosses viz., CM-119 x DMR-40E, CM-104 x AML-420 and CM-119 x DMR- 201 also showed high heterosis and sca effects for grain yield.
Diallel, triallel and quadriallel analyses were studied for grain yield in six maize inbreds. The mean phenotypic expression and range of variation for grain yields wassuperior in single cross hybrids than thethree way cross hybrids, parents and double cross hybrids, in the sequence mentioned. The general combining ability effect of the inbreds was pronounced in diallel only. The parent order was very clearly elcuidated in triallel and quadriallel. Though both additive and non additive gene action was observed in diallel, further partitioning the genetic components of variances in triallel and quadriallel analyses indicated predominance of non- allelic interactions involving dominance, suggesting that grain yield could be improved by heterosis breeding. Related inbreds could also be developed by selfing the superior crosses. The single cross hybrid 88/261 out yielded the three way or double corss hybrids. More number of economic hybrids for grain yield was observ ed in the three way crosses..
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