Exogenous Gibberellic Acid Reprograms Soybean to Higher Growth and Salt Stress Tolerance
Exogenous Gibberellic Acid Reprograms Soybean to Higher Growth and Salt Stress Tolerance
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DOI：
10.1021/jf101221t
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发表时间：
2010-06-23
影响因子：
6.1
通讯作者：
Lee, In-Jung
中科院分区：
文献类型：
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作者：
Hamayun, Muhammad;Khan, Sumera Afzal;Lee, In-Jung
农业受到盐碱化的严重影响，因为它的不利影响很大，而且分布在世界各地。观察了外源赤霉酸(GA(3))对大豆盐分缓解的影响。结果表明，GA(3)显著促进植株长度和植株鲜/干生物量，但显著抑制NaCI诱导的盐胁迫。在盐胁迫大豆植株中加入GA(3)后，生长性状显著恢复，从而减轻了盐胁迫的不利影响。在对照和盐胁迫条件下，提高GA(3)处理增加了大豆叶片中大豆苷元和染料木素(俗称植物雌激素)的含量。大豆内源激素分析表明，GA(3)处理植株体内生物活性赤霉素(GA(1)和GA(4))和茉莉酸含量增加，内源脱落酸和水杨酸含量下降。GA(3)通过调节植物激素水平来缓解盐胁迫的不利影响，从而帮助植物恢复正常的生长发育。GA(1)和GA(4)的存在表明，大豆中GA合成的早期-C13-羟化和非C13-羟化途径都是有功能的。结果表明，GA(3)能缓解盐胁迫对大豆的不利影响，恢复大豆的正常生长发育。
The agricultural industry is severely affected by salinity due to its high magnitude of adverse impacts and worldwide distribution. We observed the role of exogenous gibberellic acid (GA(3)) in salinity alleviation of soybean. We found that GA(3) application significantly promoted plant length and plant fresh/dry biomass while markedly hindered by NaCI induced salt stress. The adverse effect of salt stress was mitigated by GA(3), as growth attributes significantly recovered, when GA(3) was added to salt stressed soybean plants. Elevated GA(3) treatments increased daidzein and genistein contents (commonly known as phytoestrogens) of soybean leaves under control and salt stress conditions. Phytohormonal analysis of soybean showed that the level of bioactive gibberellins (GA(1) and GA(4)) and jasmonic acid increased in GA(3) treated plants, while the endogenous abscisic acid and salicylic acid contents declined under the same treatment. GA(3) mitigated the adverse effects of salt stress by regulating the level of phytohormones, thus aiding the plant in resuming its normal growth and development. The presence of GA(1) and GA(4) showed that both early-C13-hydroxylation and non-C13-hydroxylation pathways of GA biosynthesis are functional in soybean. It was concluded that GA(3) ameliorates the adverse effects of salt stress and restores normal growth and development of soybean.