外源Vc对盐胁迫下油葵种子萌发和幼苗生理特性的影响（英文）

Effects of Exogenous Vc on Seed Germination and Physiological Properties of Oil Sunflower(Helianthus annuus) under Salt Stress

[目的]为实际生产中缓解油葵盐害提供理论和技术依据。[方法]以油葵种子为试验材料,在种子萌发过程中选用120 mmol/L Na Cl盐胁迫和0~200 mg/L Vc溶液进行处理,研究外源Vc对盐胁迫下油葵种子萌发指标和幼苗生理特性的影响。[结果]在盐胁迫下,随着Vc溶液浓度的增加,油葵种子发芽势和发芽率、幼苗超氧化物岐化酶（SOD）和过氧化物酶（POD）活性、脯氨酸（Pro）含量均呈现先升高后降低的趋势,分别以80、120、80mg/L的Vc处理达到最大值;幼苗丙二醛（MDA）含量呈现先降后升的趋势,以160 mg/L Vc处理达到最小值。[结论]Vc能不同程度地提高盐胁迫条件下油葵种子的发芽率、发芽势,促进幼苗生长,缓解盐胁迫对油葵种子萌发和幼苗生长的危害。

[Objective] This study aimed to provide the theoretical and technical basis for alleviating salt damages in production practice of oil sunflower （Helianthus annuus）. [Method] Seeds of oil sunflower were used as experimental materials and treated with 120 mmol/L NaCI solution and 0-200 mg/L Vc solution during the germina- tion process, to investigate the effects of exogenous Vc on seed germination and physiological properties of oil sunflower under salt stress. [Result] Under salt stress, with the increase of Vc concentration, germination potential and germination rate of oil sunflower seeds, superoxide dismutase （SOD） and peroxidase （POD） activities and proline （Pro） content of oil sunflower seedlings increased first and then declined, which reached the maixmum in 80 mg/L Vc treatment, 120 mg/L Vc treatment and 80 mg/L Vc treatment, respectively; malondialdehyde （MDA） content of oil sunflower seedlings declined first and then increased, which reached the minimum in 160 mg/L Vc treatment. [Conclusion] To varying degrees, Vc could improve germination potential and germination rate of oil sunflower seeds and promote seedling growth under salt stress, thus alleviating the damages of salt stress to seed germination and seedling growth of oil sunflower.