Using Physiological Traits to Evaluating Resistance of Different Barley Promising Lines to Water Deficit Stress

S. Mohammadi, B. S. Lalehloo, M. Bayat, S. Sharafi, Farshad Habibi, Razavi Khorasan
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引用次数: 3

Abstract

To study water-stress-tolerant barley varieties, 20 barley lines were cultivated under full irrigation and limited irrigation conditions where irrigation was stopped at anthesis stage in two separate field experiments during the 2007-2009 growing seasons at the Saatloo Research Farm, Azerbaijan, Iran. The experiments were laid out using RCBD with three replications. The results from combined analysis of variance in both normal and stress conditions indicated that there were significant differences among genotypes with regard to all studied traits which were due to high variation among the genotypes. It was found that the activity of enzymes including SOD, GPX and CAT were increased under drought stress conditions, so that tolerant genotypes had more changes in enzyme activity. On the other hand, MDA, Dityrosine and 8-oHdg were increased under stress conditions where sensitive genotypes had stronger enzyme activity. Calculations of the correlation coefficients among the studied traits under both stress and normal conditions also indicated that there were negative and significant differences between antioxidant activity, lipid, protein, and DNA decadence. Finally, with regard to all traits, it was revealed that in normal conditions genotypes 18 and 19 were the best performing lines, whereas the genotype 14 was least adapted line. Therefore, genotypes 18 and 19 showed higher levels of resistance to water stress and the genotype 15 was more sensitive to the drought conditions. The results also indicated that selecting more tolerant genotypes under stress conditions was the way to overcome water deficit stress under terminal drought conditions.
利用生理性状评价不同大麦苗种对水分亏缺胁迫的抗性
为了研究耐水胁迫大麦品种,在伊朗阿塞拜疆Saatloo研究农场,在2007-2009生长季的两个单独的大田试验中,在充分灌溉和有限灌溉条件下栽培了20个大麦品系,在开花期停止灌溉。实验采用RCBD,重复三次。在正常和胁迫条件下的综合方差分析结果表明,各基因型间的性状差异显著,这是由于基因型间的高变异所致。结果表明,在干旱胁迫条件下,SOD、GPX、CAT等酶活性升高,耐受性基因型酶活性变化较大。另一方面,在敏感基因型酶活性较强的胁迫条件下,MDA、二酪氨酸和8-oHdg含量增加。对胁迫和正常条件下各性状间的相关系数计算也表明,抗氧化活性、脂质、蛋白质和DNA衰变均存在显著负向差异。结果表明,在正常条件下,基因18型和19型表现最好,而基因14型表现最差。因此,基因型18和19对水分胁迫表现出更高的抗性,而基因型15对干旱条件更敏感。结果还表明,在逆境条件下选择更具耐受性的基因型是克服干旱末期水分亏缺胁迫的途径。
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