外源水杨酸和萘乙酸对红芸豆幼苗抗旱生理的影响

Effects of Exogenous Salicylic Acid and Naphthalic Acid on Drought Resistance of Red Kidney Bean Seedlings

以红芸豆(地豆王)为材料,采用15%聚乙二醇(PEG)模拟干旱胁迫,研究外源水杨酸(salicylic acid,SA,100 mg/L)和萘乙酸(α-naphthaleneacetic acid,NAA,0.015 mmol/L)对红芸豆幼苗抗旱性的影响。结果表明,干旱条件下,喷施外源NAA、SA处理均能有效减少叶片水分流失,维持叶片相对含水量在较高水平,在干旱胁迫24 h后,叶片相对含水量仍高达81.30%、77.00%。SA、NAA处理可有效减缓MDA含量的积累,与CK处理相比分别低48.20%、49.12%;24 h内NAA较CK处理总叶绿素含量增加40.63%,在干旱胁迫36 h内SA可使红芸豆叶绿素a含量增加,但SA、NAA会造成可溶性蛋白质含量的降低,但总体而言,NAA、SA处理能提高红芸豆幼苗的抗旱能力。

The effects of salicylic acid(SA,100 mg/L)andα-Naphthaleneacetic acid(NAA,0.015 mmol/L)on physiological characters of red kidney bean(land bean king)under drought stress of 15%polyethylene glycol(PEG)during bean seedlings were studied.The results showed that spraying exogenous NAA,SA under the drought conditions could effectively reduce the loss of leaf water and maintain the relative water content of the leaves at a high level.After 24 h of the drought stress,the relative water content of the leaves was still high,which was 81.30%and 77.00%.SA and NAA processing could effective reduce the accumulation of MDA contents,which was 48.20%and 49.12%lower than that processed by CK respectively.Within 24 h of the drought stress,NAA could increase the total chlorophyll content,which was 40.63%higher than that processed by CK respectively.Within 36 h of the drought stress,SA could increase the content of chlorophyll a,but SA and NAA would reduce the soluble protein content.In general,NAA and SA processing could improve the drought resistance ability of red kidney bean seedlings.