School of Applied Biosciences, College of Agriculture and Life Sciences, Kyungpook National University, South Korea.
J Agric Food Chem. 2010 Jun 23;58(12):7226-32. doi: 10.1021/jf101221t.
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 NaCl 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.
由于其影响范围广、危害大，农业生产受到盐胁迫的严重影响。本研究观察了外源赤霉素（GA（3））在缓解大豆盐胁迫中的作用。结果表明，GA（3）处理显著促进了植株的伸长和地上部及根系鲜/干重，而 NaCl 诱导的盐胁迫则显著抑制了植株的生长。当向盐胁迫下的大豆植株中添加 GA（3）时，盐胁迫的不利影响得到缓解，因为生长特性得到了显著恢复。在对照和盐胁迫条件下，GA（3）处理均提高了大豆叶片中大豆苷元和染料木素（通常称为植物雌激素）的含量。对大豆的植物激素分析表明，在 GA（3）处理的植株中，生物活性赤霉素（GA（1）和 GA（4））和茉莉酸的水平增加，而在相同处理下，内源脱落酸和水杨酸的含量下降。GA（3）通过调节植物激素水平来减轻盐胁迫的不利影响，从而帮助植物恢复正常的生长和发育。GA（1）和 GA（4）的存在表明，大豆中 GA 生物合成的早期 C13-羟化和非 C13-羟化途径均具有功能。因此，GA（3）可以缓解盐胁迫对大豆的不利影响，恢复其正常的生长和发育。
