水杨酸浸种对棉花幼苗抗旱性的影响

Effects of Soaking with Salicylic Acid on Drought Resistance of Cotton Seedling

利用不同浓度的水杨酸对棉花种子进行浸种处理,出苗后,用称重法控制土壤水分,使之维持在中度干旱状态。测定幼苗各项生理指标,结果如下:经过处理后的棉花叶片中的丙二醛(MDA)含量、超氧阴离子自由基(O_2^-)产生速率有所下降,而超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)、抗坏血酸过氧化物酶(APX)的活性却比未经处理的有一定的提高。另外,可溶性蛋白质含量、叶绿素含量、叶绿素a/b的值、叶片保水力、干重含水量、根系活力、根冠比、植株干重也同样呈升高的趋势。因此,水杨酸浸种对棉花的抗旱性及其相关的生理指标有一定的影响。

Using different concentration of salicylic acid to treat cotton seed and maintaining moderate drought by weighing method after sprouting, physiological indexes from cotton seedling were measured. The results shows that：Compared with the ck, salicylic acid obviously increased the activities of different Protective enzymes such as Superoxide Dismutase （ SOD ）, Peroxidase （ POD ）, Ascorbate eroxidase （ APX）, Catase （CAT）. Salicylic can also increased the contents of soluable protein, chlorophyll, chl. a/b, roots resistance and the holding ability for water of cotton leaves. But the content of Malondiald Ehyde（MDA） and the producing rate of Superoxide radical（ O2^- ） were obviously decreased. So we believe that salicylic acid has some effects on different Physiological targets and drought resistance of cotton seedling.