钙对盐胁迫条件下油葵幼苗生长速率和抗氧化酶活性的影响

Effects of Ca on Growth Rate and Antioxidant Enzyme Activities of Oil Sunflower Seedlings under Salt Stress Condition

[目的]研究钙对盐胁迫条件下油葵幼苗生长和抗氧化酶活性的影响。[方法]以“杂交油葵G101”的幼苗为试材，采用砂培法研究150mmol/L NaCl胁迫下，不同浓度CaCl2处理对其生长速率和抗氧化酶系统的影响。[结果]在150mmol/L NaCl胁迫下，低浓度（4～19mmol/L）CaCl2处理可提高油葵幼苗的生长速率，而高浓度（≥30mmol/L）CaCl2处理对油葵幼苗有毒害作用。10mmol/L CaCl2处理对盐胁迫条件下油葵幼苗的生长最有利；在盐胁迫下，CaCl2处理可明显提高油葵幼苗的超氧化物歧化酶（SOD）、过氧化物酶（POD）和过氧化氢酶（CAT）活性、降低丙二醛（MDA）的含量。[结论]适当浓度的CaCl2处理可有效减轻盐胁迫对油葵幼苗的伤害。

[ Objective] The study was to research the effects of Ca on the growth and antioxidant enzymes activities of oil sunflower seedlings under the salt stress. [ Method] With the seedlings of Hybrid oil sunflower G101 as the tested material, the sand cultivation was taken to study the effects of treatments by CaCl2 with different concn, on its growth rate and antioxidant enzyme system under the stress of 150 mmol/L NaCl. [ Result] Under the stress of 150 mmol/L NaCl, the treatment by CaCl2 with low concn. （4 - 19 mmoL/L） could increase the growth rate of oil sunflower seedling, but the treatment by CaCl2 with high concn. （ ≥30 mmoL/L ） had poisoning effect on oil sunflower seedlings. The treatment by CaCl2 with 10 mmol/L was the most favorable to the growth of oil sunflower seedlings. Under salt stress, the treatment by CaCl2 could obviously increase the activities of superoxide dismutase （SOD）, peroxidase （POD） and catalase（CAT） and decrease the malondialdehyde （MDA） content in oil sunflower seedlings. [ Conclusion] Treatment by CaCl2 with proper conch, could effectively reduce the damage of salt stress on oil sunflower seedling.