Evaluation of genetic diversity of bread and durum wheat genotypes based on agronomy traits and some morphological traits in non-stress and terminal drought stress conditions

Authors

1 Assoc. Prof., Dept. of Agronomy and Plant Breeding, Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran

2 Ph. D. Student, Dept. of Agronomy and Plant Breeding, Faculty of Agriculture, Maragheh University, Maragheh, Iran

3 M. Sc. Graduate, Dept. of Agronomy and Plant Breeding, Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran

4 B. Sc. Graduate, Dept. of Agronomy and Plant Breeding, Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran

Abstract

To evaluate the genetic diversity and the effect of terminal drought stress on grain yield and some morphological traits of wheat, an experiment was conducted using 56 wheat genotypes in a latis (7×8) with three replications under normal and terminal drought stress conditions in research farm of the Campus of Agriculture and Natural Resources, Razi University, Kermanshah, Iran, in 2010-2011 cropping season. The result of combined analysis of variance indicated high significant differences among genotypes for all studied traits including grain yield, number of grain per spike, 1000-grain weight, spike yield, biomass, harvest index and plant height. Terminal drought stress reduced 34.5% of spike yield, 30% of biomass, 27.2% of grain yield, 21.6% of number of grains per spike, 15.9% of 1000-grain weight, 6.13% of harvest index, 5.64% of plant height and 0.15% of peduncle weight, but it increased 1.47% and 0.20% of peduncle and penultimate internode length, respectively. There were high negative significant correlation between grain yield and penultimate internode length and also between biomass and harvest index under both non-stress and drougth stress conditions, whereas correlation between number of grain per spike and harvest index and between plant height and spike length was highly positive significant. The correlation analysis among grain yield under non-stress and terminal drought stress conditions with different drought tolerance indices showed that stress tolerance index (STI), mean productivity (MP) and geometric mean productivity (GMP) indices were appropriate indicators to identify the high grain yield genotypes. On the basis of these indicators, Moghan-1, Navid, Golestan, Darab-2 and Marvdasht genotypes had the highest grain yield under both experimental conditions.

Keywords

References

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Cereal Research
Volume 5, Issue 4
December 2015
Pages 353-369

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