MOHSEN SAEIDI1, MAJID ABDOLI2,3*, MANDANA AZHAND4, MARYAM KHAS-AMIRI4
1Assistant Prof., Department of Agronomy and Plant Breeding, Campus of Agriculture and Natural Recourse, Razi University, Kermanshah, Iran.
2Ph.D. Student in Crop Physiology, Department of Agronomy and Plant Breeding, Faculty of Agriculture, Maragheh University, Maragheh, Iran.
3Young Researchers and Elite Club, Zanjan Branch, Islamic Azad University, Zanjan, Iran.
4Former M.Sc. Student in Agronomy, Department of Agronomy and Plant Breeding, Campus of Agriculture and Natural Recourse, Razi University, Kermanshah, Iran.
Abstract: In order to determine the performance of barley under drought stress conditions and screening quantitative indices of drought tolerance, twelve barley (Hordeum vulgare L.) cultivars were tested in a split-plot arranged in a randomized complete blocks design with three replications under irrigated and post-anthesis water deficiency conditions. This study was carried out in the field research of campus of agriculture and natural resources, Razi university, Kermanshah state in the west of Iran during 2010-2011. The results showed that post anthesis water deficiency caused 22, 18.3, 5.9, 5.5 and 21.9 percentreduction in grain yield, biomass, thousand grain weight, number of grain per spike and number of spike per m2 in average respectively, but had no significant effect on harvest index. Mean comparisons showed that Nosrat cultivar with 838 g m-2 and Afzal cultivar with 392 g m-2, respectively had the highest and the lowest grain yield under non-stress condition. Under water stress environment Nosrat and Karouncultivars with 696 and 656 g m-2 and also, Aras and Sahra cultivars with 322 and 327 g m-2, respectively had the highest and the lowest grain yield. The estimates of stress tolerance attributes indicated that the identification of drought-tolerant genotypes based on a single criterion was contradictory. For example, according to STI, GMP and MP cultivars Nosrat, Karoun and Sararud were the most, whereas Aras and Afzal cultivars the least relative tolerant genotypes. As to YI cultivars Nosrat, Karoun and Sararud were the most and Aras, Sahra and Afzal the least relative tolerant genotypes. According to YSI, SSPI, RDI and ATI indices selected the Sararud and Zarjo cultivars as the most relatively tolerant genotypes. DI selected the cultivars Sararud, Nosrat and Karoun as the best, while the cultivars Sahra, Aras and Reihan as the theworst relatively tolerant genotypes. Grain yield in stress condition was significantly and positively correlated with MP, GMP, STI, Harm, YI and DI. Also, grain yield in non-stress condition was significantly and positively correlated with MP, GMP, STI, Harm, YI, DI and ATI indicating that these criteria were more effective in identifying high yielding cultivars under different moisture conditions.
Keywords: Barley, Water deficiency, Agronomic characteristics, Drought tolerance indices.