Study of the morpho-physiological traits and stability of grain yield in promising winter and facultative wheat (Triticum aestivum L.) genotypes in cold regions under post-anthesis drought stress condition (ERWYT -CD88)
2011
Yazdansepas, A | Kamel, M | Babaie, T | Chiychi, M | Abedi, M. S | Najafi Mirak, T | Afshari, F | Mahfouzi, S | Qavidel, N | Mohammadi, B | Sheykhi, M | Hosseini, S. H | Bayrami, H | Navidazar, R | Mortezagholi, M | Shafipour, M. T | Babaiegol, I
Iran is located in arid and semi -arid regions of the world. Because of low average rainfall in the country, improvement of wheat varieties tolerant to drought is in top priority in research programs. In this study 15 winter and facultative bread wheat genotypes along with Shahriyar, Alvand and C-80-4 (checks) were evaluated under post-anthesis drought stress condition at Karadj, Zanjan, Arak, Hamedan and Tabriz experimental stations during 2009110 and 2010111 cropping seasons. Experimental design in all locations was randomized complete block (RCB) with three replications. Results of combined ANOYA showed that main effect of genotype, and interaction of location x year, genotype x location and genotype x location x year were significant. Based on results of stability analysis using simultaneous selection for yield and stability (YS), genotypes CD¬88-7 with average grain yield of 5017 kg ha-1 and YS=19 was determined as the most superior and tolerant line. Using data of some morpho-physiological traits from Arak experimental station showed that 32% of grain yield was come from pre-anthesis photoassimilates which reserved in vegetative organs. Harvest index was 35%. Correlation coefficients between the traits showed significantly positive correlation between grain yield with number of spikes m', peduncle weight at maturity, number of grain m-2 and grain weight m".
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