Effect of genes for resistance to the causal agent of corn (Zea mays L.) charcoal rot Macrophomina phaseolina (Tassi) Goid
1998
Purar, B.
There were studied the effects of genes for the inheritance of resistance to the causal agent of charcoal stem rot Macrophomina phaseolina, grain yield, and water content in the internode below the ear. Chosen for the study were six crosses that had previously been determined to be different with regard to their resistance to the above pathogen. Six generations (P1, P2, F1, F2, BC1, BC2) of one cross were included in the study in order to determine the values of parameters for additive and dominant gene effects and effects of two-gene epistasis. It was determined that additive genes played the most important role in the inheritance of both stem resistance to the causal agent of charcoal rot and water content in the internode below ear. As for the inheritance of corn grain yield, however, it was dominant gene effects that had higher values. In the case of all three traits, the less favourable, duplicate epistasis was found between the dominant genes. The values of narrow sense heritability for grain yield and stem resistance to the causal agent of charcoal stem rot were low to medium high, while those for water content in the internode below the ear were low. The values of broad sense heritability were high for all three traits.
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