Methyl jasmonate triggers loss of grain yield under drought stress
Methyl jasmonate triggers loss of grain yield under drought stress
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DOI：
10.4161/psb.4.4.8199
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发表时间：
2009-01-01
影响因子：
2.9
通讯作者：
Kim, Ju-Kon
中科院分区：
文献类型：
--
作者：
Kim, Eun Hye;Park, Su-Hyun;Kim, Ju-Kon
干旱是全球水稻生产的主要制约因素之一。干旱条件下，水稻穗部和小穗分生组织的发育受到抑制，导致穗数和小穗数减少。在我们最近的报告中，我们证明了茉莉酸甲酯（MeJA）在干旱引起的粮食产量损失中起着重要作用。转基因过量表达拟南芥基因茉莉酸羧甲基转移酶（AtJMT）在水稻中导致了大量的减少，通过增加MeJA和阿坝水平在年轻的穗的粮食产量。非转基因植物暴露于干旱条件下也增加了MeJA和阿坝水平在年轻的穗和显着降低粮食产量。在这两种情况下，减少粮食产量是由于较低的小穗数和较低的灌浆速率比观察到的非转基因（NT）控制。在非干旱条件下生长的AtJMT转基因穗中阿坝增加表明，MeJA，而不是干旱胁迫，诱导干旱条件下阿坝合成。这些结果使我们假设植物在干旱胁迫期间产生MeJA，这反过来又刺激阿坝的产生，共同导致谷物产量的损失。
Drought is one of the major constraints to rice production worldwide. The development of rice panicle and spikelet meristem is repressed under the drought conditions, resulting in a reduction in the numbers of panicles and spikelets. In our recent report, we demonstrated that methyl jasmonate (MeJA) plays an important role in drought-induced loss of grain yield. Transgenic overexpression of the Arabidopsis gene jasmonic acid carboxyl methyltransferase (AtJMT) in rice resulted in a large reduction in grain yield through increased MeJA and ABA levels in young panicles. Exposure of nontransgenic plants to drought conditions also increased MeJA and ABA levels in young panicles and significantly reduced grain yield. In both cases, the reduction in grain yield was due to lower numbers of spikelets and lower filling rates than were observed for nontransgenic (NT) controls. The ABA increase in AtJMT transgenic panicles grown in non-drought conditions suggests that MeJA, rather than drought stress, induces ABA biosynthesis under drought conditions. These results led us postulate that plants produce MeJA during drought stress, which in turn stimulates the production of ABA, together leading to a loss of grain yield.