海水胁迫下外源海藻糖对黄秋葵幼苗耐盐性的影响

Effects of exogenous trehalose on salt tolerance of okra seedlings underseawater stress

为了研究不同浓度的外源海藻糖对海水胁迫下黄秋葵幼苗生长和生理的影响,以耐盐黄秋葵品种无角香蕉和盐敏感品种非洲秋葵为材料进行50%浓度的海水胁迫处理。结果表明,海水胁迫后2个品种各性状指标的变幅范围为4.90%~748.57%。外源施用海藻糖可以提高海水胁迫下黄秋葵的苗高、干质量、鲜质量和K^(+)含量,降低Na^(+)含量和Na^(+)/K^(+),但不能使内源海藻糖含量显著增加。外源喷施海藻糖能够有效缓解海水胁迫对黄秋葵生长的抑制作用。随着外源施用海藻糖浓度的升高,2个品种的Na^(+)/K^(+)呈先降低后升高的趋势;除无角香蕉的根部K^(+)和2个品种的Na^(+)及内源海藻糖含量外,其他性状均呈先升高后降低的趋势。大部分性状在外源海藻糖浓度为15 mmol·L^(-1)时达到最佳值,说明外源海藻糖的最佳施用浓度为15 mmol·L^(-1)。研究结果为明确海水胁迫下外源海藻糖对黄秋葵耐盐性的影响提供了理论依据。

In order to study the effects of different concentrations of exogenous trehalose on the growth and some physio-logical indicators of okra seedlings under seawater stress,the salt-tolerant okra cultivar Wujiaoxiangjiao and salt-sensitive cultivar Feizhouqiukui were used as materials for 50%seawater stress treatment.Five trehalose solutions were applied for exogenous spraying,and 11 morphological and physiological indicators were measured.The results showed that the varia-tion range of each trait of the two varieties was 4.90%-748.57%after seawater stress.Exogenous application of trehalose could increase the seedling height,dry weight,fresh weight and K^(+)content of okra under seawater stress,and reduce the Na^(+)content and Na^(+)/K^(+),but could not significantly increase the endogenous trehalose content.Exogenous trehalose could effectively alleviate the inhibition of okra growth under seawater stress.With the increase of trehalose concentration,the Na^(+)/K^(+)of the two varieties decreased at first and then increased.Except for the K^(+)content in the root of Wujiaoxiangjiao and Na^(+),endogenous trehalose content of the two varieties,all the other traits showed a trend of first increasing and then decreasing.Most traits had the best value when the concentration of exogenous trehalose was 15 mmol·L^(-1),which indicat-ed that the optimal application concentration of exogenous trehalose was 15 mmol·L^(-1).This study provided a theoretical basis for clarifying the effects of exogenous trehalose on the salt tolerance of okra under seawater stress.