Exogenous salicylic acid improves the germination of Limonium bicolor seeds under salt stress
Exogenous salicylic acid improves the germination of Limonium bicolor seeds under salt stress
复制标题
外源水杨酸促进盐胁迫下补血草种子的萌发
DOI：
10.1080/15592324.2019.1644595
复制
发表时间：
2019-07-25
影响因子：
2.9
通讯作者：
Chen, Min
中科院分区：
文献类型：
--
作者：
Liu, Jing;Li, Lingyu;Chen, Min
摘要水杨酸（SA）可以提高植物对非生物胁迫的耐受性，但其作用机制尚不清楚。本文研究了盐胁迫下外源水杨酸对盐生植物二色补血草种子萌发的影响。具体而言，我们研究了盐胁迫对种子萌发，糖和蛋白质含量，淀粉酶活性，和各种激素的含量，无论是在存在和不存在外源SA处理的影响。发芽显着抑制由200 mM NaCl处理，但显着改善时，0.08 mM SA同时施加。萌发过程中，SA处理的种子赤霉素（GA）含量高，淀粉酶和α-淀粉酶活性高，脱落酸（阿坝）含量低。SA处理上调了参与GA生物合成的关键基因的表达，同时下调了参与阿坝生物合成的关键基因的表达，从而触发了GA和阿坝之间有利的激素平衡，增强了盐胁迫下的种子萌发。
ABSTRACT Salicylic acid (SA) may improve plant tolerance to abiotic stresses; however, little is known about the underlying mechanisms by which this is achieved. Here, we investigated the effects of exogenous SA application on seed germination in the halophyte Limonium bicolor (Kuntze) under salt stress. Specifically, we examined the effect of salt stress on seed germination, sugar and protein contents, amylase activity, and the contents of various hormones, both in the presence and absence of exogenous SA treatments. Germination was significantly suppressed by a 200 mM NaCl treatment but was significantly improved when 0.08 mM SA was concurrently applied. During germination, the seeds treated with SA had high levels of gibberellic acid (GA) and high levels of amylase and α-amylase activity, but low abscisic acid (ABA) contents. The SA treatment upregulated the expression of key genes involved in GA biosynthesis while downregulating those involved in ABA biosynthesis, thereby triggering a favorable hormonal balance between GA and ABA that enhanced seed germination under salt stress.