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羊草（Leymus chinensis）与灰色赖草（Leymus cinereus）及其杂交种（F₁）的抗旱生理特性比较

Studies on physiological indices of drought resistance in Leymus chinensis and Leymus cinereus as well as their hybrid

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【Author】 HOU Jian-hua~1,　YUN Jin-feng~2, ZHANG Dong-hui~1(1.College of Agronomy, Inner Mongolia Agricultural University, Hohehot 010019, China;2.College of Ecology and Environment, Inner Mongolia Agricultural University, Hohehot 010019, China)

【机构】内蒙古农业大学农学院；内蒙古农业大学生态环境学院；内蒙古农业大学农学院内蒙古呼和浩特　010019；内蒙古呼和浩特　010019；内蒙古呼和浩特　010019；

【摘要】用不同浓度的聚乙二醇(PEG6000)进行根际水分胁迫处理,研究羊草(Leymuschinensis)、灰色赖草(Leymuscinereus)及其杂交种的抗旱生理特性。结果表明,在15%PEG、25%PEG、35%PEG不同处理下,两亲本及其杂交种叶片相对含水量(RWC)逐渐降低;相对电导率、丙二醛含量(MDA)逐渐增加;超氧化物歧化酶活性(SOD)在15%PEG、25%PEG处理下,活性逐渐增加,在35%PEG处理下,活性开始下降。而且在15%PEG、25%PEG处理下,杂交种的抗旱(耐旱)性与亲本羊草相近,明显大于另一亲本灰色赖草。更多还原

【Abstract】 Under different drought-stress conditions simulated by different concentration of polyethylene glycol 6000(PEG6000),physiological indices of drought resistance in Leymus chinensis and Leymus cinereus as well as their hybrid were studied. The results showed that for the hybrid and its parents, the relative water contents in leaves decreased; the relative electric conductivity and malon-dialdehyde (MDA) content in leaves increased under all drought-stress. Superoxide diamutase(SOD) activity increased under 15%PEG treatment and 25%PEG treatment, but SOD activity began to decrease under 35%PEG treatment. Furthermore, the drought resistance of the hybrid is similar to that of Leymus chinensis and stronger than that of Leymus cinereus under 15%PEG and 25%PEG treatment.更多还原