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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。
Rhizosphere water stress treatment was conducted with different concentrations of polyethylene glycol (PEG6000) to study the drought resistance physiological characteristics of Leymus chinensis, Leymuscinereus and their hybrids. The results showed that the relative water content (RWC) of two parents and their hybrids decreased gradually under the treatments of 15% PEG, 25% PEG and 35% PEG, while the relative conductivity and the content of malondialdehyde (MDA) increased gradually Oxidative dismutase activity (SOD) activity increased with 15% PEG and 25% PEG treatment, but decreased with 35% PEG treatment. Moreover, the drought resistance (drought tolerance) of hybrids was similar to that of the parent Leymus chinensis under 15% PEG and 25% PEG treatment, significantly higher than that of the other parent Leymus chinensis.