不同CaCl_2浓度对低温胁迫下豇豆幼苗生理指标的影响

Effect of different concentrations of CaCl_2 on physiological characteristics of cowpea seedlings under low temperature

为研究CaCl_2对蔬菜低温胁迫的缓解效应,以豇豆幼苗为试验材料,在10℃低温处理条件下用不同浓度(0、5、10、20、40 mmol·L^(-1))CaCl_2喷施豇豆幼苗叶片。结果表明,喷施CaCl_2能普遍提高豇豆幼苗生物量、相对含水量、光合色素含量、脯氨酸含量、可溶性糖含量及抗氧化酶活性,降低其相对电导率及丙二醛含量。且10 mmol·L^(-1)CaCl_2处理后,豇豆幼苗各部分生物量、光合色素含量达到最大,超氧化物岐化酶活性较对照增加99.6%、过氧化氢酶活性较对照增加29.49%,且相对电导率、丙二醛含量分别较对照降低62.07%、36.15%。因此,CaCl_2能够缓解低温胁迫对豇豆生理生态的影响,且浓度为10 mmol·L^(-1)的CaCl_2效果最好。

In order to study the alleviation effect of different concentrations of CaCl2 on physiological characteristics of cowpea seedlings under low temperature. The leaves of cowpea seedlings were foliage sprayed with different concentrations (0, 5, 10, 20, 40 mmol·L^-1) of CaCl2 under low temperature treatment (10 ℃). The results showed that the biomass, relative water content, photosynthetic pigment content, proline content, soluble sugar content and the activities of antioxidant enzymes of cowpea seedlings were all increased after foliage spraying with CaCl2, the relative conductivity and malondialdehyde content of cowpea seedlings were decreased. The biomass and content of photosynthetic pigment reached the maximum under 10 mmol · L^-1 CaCl2 concentration treatment, compared with the control, the activity of superoxide dismutase increased 99.6%, the catalase activity increased 29.49%, the relative conductivity and malondialdehyde content decreased 62.07%, 36.15% respectively. In conclusion, 10 mmol · L^- 1 CaCl2 showed the best alleviation effect on the cowpea seedlings under low temperature.