水杨酸对盐胁迫下线型辣椒幼苗生理特性的影响

Effects of salicylic acid on physiological characteristics of linear pepper seedlings under salt stress

天津市盐渍化土地面积约占天津市总土地面积的65.8%。天津市辣椒种植面积约为2133 hm^2,其产量高低影响着天津市菜篮子工程,研究辣椒在盐渍化土壤上的生长状况具有重要意义。本文研究了水杨酸对盐胁迫下辣椒幼苗生理特性的影响。结果表明:在无盐条件下,水杨酸对辣椒幼苗脯氨酸含量没有影响,但显著提高了辣椒幼苗可溶性糖含量,增加了过氧化物酶(POD)和超氧化物歧化酶(SOD)活性;在60 mmol/L和120 mmol/L盐浓度条件下,水杨酸显著提高了辣椒幼苗脯氨酸、可溶性糖含量以及POD和SOD活性,显著降低了丙二醛(MAD)含量。表明水杨酸可增加辣椒幼苗渗透物质的含量和抗氧化酶活性,从而提高其抗盐能力。

The salinized land area of Tianjin accounts for 65.8%of the total land area of Tianjin,and the pepper planting area of Tianjin is about 2133 hm^2.The yield of pepper affects the vegetable basket project in Tianjin,soit is important to study the growth of pepper in salinized soil.The effects of salicylic acid on physiological characteristics of pepper seedlings under salt stress were studied.The results showed that salicylic acid had no effect on the proline content of pepper seedlings under the condition of no salt.Salicylic acid significantly increased the soluble sugar content of pepper seedlings,the activities of peroxidase(POD)and that of superoxide dismutase(SOD).Under the condition of 60 mmol/L and 120 mmol/L salt concentration,salicylic acid significantly increased the content of proline and soluble sugar,significantly increased the activities of POD and SOD,and significantly reduced the content of malondialdehyde(MAD).Salicylic acid can improve the salt resistance of pepper seedlings by increasing the content of osmotic substances and the activity of antioxidant enzymes.