Tuning water-use efficiency and drought tolerance in wheat using abscisic acid receptors
Tuning water-use efficiency and drought tolerance in wheat using abscisic acid receptors
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DOI：
10.1038/s41477-019-0361-8
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发表时间：
2019-02-01
期刊：
影响因子：
18
通讯作者：
Okamoto, Masanori
中科院分区：
文献类型：
--
作者：
Mega, Ryosuke;Abe, Fumitaka;Okamoto, Masanori
水分供应是陆地植物生产力的关键决定因素。许多气候模型预测，水资源压力将日益挑战农业产量，并加剧预计的粮食短缺。为了确保粮食安全和提高农业效率，必须提高作物水分生产力。过去几十年的研究已经证实，植物激素脱落酸（ABA）是水分利用的中心调节剂，直接调节气孔打开和蒸腾作用。在本研究中，我们研究了是否可以通过增加小麦对ABA的敏感性来提高其水分生产力。我们发现小麦ABA受体的过表达增加了小麦ABA敏感性，这显著降低了植物一生的耗水量。生理分析表明，这种节水特性是蒸腾作用减少和光合作用活性增加的结果，这两者共同提高了每升水的粮食产量，并在缺水时保护了生产力。我们的研究结果提供了一种提高水分生产力的一般策略，由于ABA信号通路的高度保护，这种策略应该适用于其他作物。
Water availability is a key determinant of terrestrial plant productivity. Many climate models predict that water stress will increasingly challenge agricultural yields and exacerbate projected food deficits. To ensure food security and increase agricultural efficiency, crop water productivity must be increased. Research over past decades has established that the phytohormone abscisic acid (ABA) is a central regulator of water use and directly regulates stomatal opening and transpiration. In this study, we investigated whether the water productivity of wheat could be improved by increasing its ABA sensitivity. We show that overexpression of a wheat ABA receptor increases wheat ABA sensitivity, which significantly lowers a plant's lifetime water consumption. Physiological analyses demonstrated that this water-saving trait is a consequence of reduced transpiration and a concomitant increase in photosynthetic activity, which together boost grain production per litre of water and protect productivity during water deficit. Our findings provide a general strategy for increasing water productivity that should be applicable to other crops because of the high conservation of the ABA signalling pathway.