Studying the inheritance mode of grain yield and yield components in bread wheat genotypes using generations mean analysis

Document Type : Research Paper

Authors

1 Scientific Staff Member, Research Center for Agriculture and Natural Resources, Agricultural Research, Education and Extension Organization, Tehran, Iran

2 Assoc. Prof., Dept. of Agronomy and Plant Breeding, Faculty of Agriculture, Shahed University, Tehran. Iran

3 M. Sc. Student, Dept. of Agronomy and Plant Breeding, Faculty of Agriculture, Shahed University, Tehran. Iran

Abstract

Grain yield is the result of interaction among its components. This trait is influenced by genetic and environmental factors. Therefore, yield improvement through plant breeding, especially in early generations is difficult. Selection can be effective if it did base on yield components. In order to study mode of genes action and heritability of grain yield and some of its related traits in bread wheat, generations of cross Gasspard × DN-11 including F1, F2, BC1 and BC2 along with parents (P1and P2) were studied in the research field of Tehran Agricultural and Natural Resources, in a randomized complete block design with three replications. The results of the Generation Mean Analysis showed that in most cases, a digenic model including additive, dominance, and epistasis effects was appropriate to explain the variation of generations mean, so that the six parameters model including mean (m), additive (d), dominance (h), and epistasis additive × additive (i), additive × dominance (j), and dominance × dominance (l) were effective in controlling of traits under study. The epistasis effects including additive × additive, dominance × dominance were distinguished as the most important effects in controlling plant height, number of grain per spikelet, number of sterile spikelets, and grain yield, as well as additive and dominant effects of genes for 1000-grains weight and grain weight per spike, and also the epistasis effects of additive × dominance, and dominance × dominance for traits including spike length, peduncle length, and days to flowering. Thus, it should be considerate the mode of gene action for population improvement, as well as choosing an appropriate breeding method.

Keywords

References

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Cereal Research
Volume 6, Issue 3
December 2016
Pages 283-292

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