Exogenous abscisic acid and jasmonic acid restrain polyethylene glycol-induced drought by improving the growth and antioxidative enzyme activities in pearl millet
Exogenous abscisic acid and jasmonic acid restrain polyethylene glycol-induced drought by improving the growth and antioxidative enzyme activities in pearl millet
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DOI：
10.1111/ppl.13247
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发表时间：
2020-11-10
影响因子：
6.4
通讯作者：
Huang, Linkai
中科院分区：
文献类型：
--
作者：
Awan, Samrah A.;Khan, Imran;Huang, Linkai
干旱胁迫是农业中最大和最持久的限制因素之一，它导致作物生产力的巨大损失。然而，外源脱落酸（阿坝）和茉莉酸（JA）对珍珠粟（PennisetumglaucumL.）PEG诱导的干旱胁迫。因此，本研究探讨了外源阿坝和JA在提高珍珠粟耐旱性中的作用。将13天龄的幼苗暴露于以下六种不同的处理：对照（ck）、PEG-600（20%）、JA（100 μ M）、阿坝（100 μ M）、PEG+JA和PEG+阿坝，并在处理后7天和14天（DAT）收集数据。结果表明，PEG处理降低了植株生长，同时由于叶片中APX、CAT和SOD等抗氧化酶活性降低，导致H2 O2和MDA含量增加，从而加重了氧化损伤。外源阿坝和JA通过提高PEG处理下的叶绿素含量和相对含水量，促进了幼苗的生长。外源阿坝和JA在PEG胁迫下诱导的植物抗氧化酶活性增加，显著改善了植物的防御系统。总体而言，茉莉酸的表现被发现比阿坝在PEG诱导的干旱胁迫下，和未来的调查需要探索这些植物激素对长期作物管理和干旱胁迫下的生产力的潜在影响。
Drought stress is one of the most immense and permanent constraints in agriculture, which leads to a massive loss of crop productivity. However, little is known about the mitigation role of exogenously applied abscisic acid (ABA) and jasmonic acid (JA) in pearl millet (Pennisetum glaucum L.) under PEG-induced drought stress. Therefore, the current study investigated the putative role of exogenous ABA and JA in improving drought stress tolerance in pearl millet. Thirteen-day-old seedlings were exposed to six different treatments as follow; control (ck), PEG-600 (20%), JA (100 mu M), ABA (100 mu M), PEG+JA, and PEG+ABA, and data were collected at 7 and 14 days after treatment (DAT). Results showed that PEG decreased plant growth while the oxidative damage increased due to over production of H2O2 and MDA content as a result of decreased activities of the antioxidative enzymes including APX, CAT, and SOD in the leaves. However, exogenous ABA and JA positively enhanced the growth profile of seedlings by improving chlorophyll and relative water content under PEG treatment. A significant improvement was observed in the plant defense system resulting from increased activities of antioxidative enzymes due to exogenous ABA and JA under PEG. Overall, the performance of JA was found better than ABA under PEG-induced drought stress, and future investigations are needed to explore the potential effects of these phytohormones on the long-term crop management and productivity under drought stress.