文献类型：期刊文献

英文题名：DA-6 improves sunflower seed vigor under Al3+ stress by regulating Al3+ balance and ethylene metabolic

作者：Cai, Shuyu[1];Wu, Liyuan[1];Wang, Guofu[1];Liu, Jianxin[1];Song, Jiangping[1];Xu, Hua[1];Luo, Jie[1];Shen, Yi[1];Shen, Shuyu[1]

机构：[1]Shaoxing Univ, Sch Architectural Engn, Yuanpei Coll, Qunxianzhong Rd 2799, Shaoxing 312000, Peoples R China

年份：2022

卷号：229

外文期刊名：ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY

收录：SCI-EXPANDED(收录号：WOS:000740094200006)、、WOS

基金：Funding statement This research was supported by the National Natural Science Foun-dation of China (31902095) and Startup Foundation for Introducing Talent of Shaoxing University Yuanpei College (9999910302) .

语种：英文

外文关键词：DA-6; Sunflower; Al3+ stress; Seed vigor; Organic acids; Phytohormone

外文摘要：Aluminum (Al3+) stress restricts plant seed germination and seedling growth seriously. Here, the sunflower "S175" variety was used to explore the technique of improving seed vigor under Al3+ stress and investigate the effect of diethyl aminoethyl hexanoate (DA-6) on physiological characteristics in sunflower seeds during germination under Al3+ stress. The results showed that 3.0 mmol.L-1 Al3+ treatment significantly suppressed the sunflower seed germination and seedling growth. Al3+ stress significantly increased Al3+ content and secretion rates of citric and malic acids in sunflower seeds during germination. Besides, endogenous ethylene content was increased in Al3+-treated seeds. DA-6 serves as a positive signal to regulate the sunflower seed germination under Al3+ stress. Moreover, DA-6 enhanced the activities of malic dehydrogenase, citrate synthase, and isocitrate dehydrogenase, up-regulated the expressions of organic acid transport-related genes (ALMT and MATE), resulting in reduced accumulation of Al3+. Furthermore, exogenous DA-6 mitigated excessive accumulation of ethylene by decreasing the 1-aminocyclopropane-1-dihydrodipicolinate synthase activity and related-gene expression. However, DA-6 treatment had no effect on abscisic acid or gibberellin metabolism in sunflower seeds under Al3+ stress. These results confirmed that DA-6 application enhanced the germination capacity through induction of the synthesis and transport of malic and citric acids, and suppression of the excessive accumulation of endogenous ethylene, thus contributing to alleviate Al3+ toxicity in sunflower seeds.