Improved waterlogging tolerance of barley (Hordeum vulgare) by pretreatment with ethephon
Improved waterlogging tolerance of barley (Hordeum vulgare) by pretreatment with ethephon
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DOI：
10.1080/1343943x.2019.1581579
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发表时间：
2019-02
影响因子：
2.5
通讯作者：
K. Shiono;Masato Ejiri;Kana Shimizu;Sumiyo Yamada
中科院分区：
文献类型：
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作者：
K. Shiono;Masato Ejiri;Kana Shimizu;Sumiyo Yamada
植物根系在缺氧或缺氧淹水土壤中的生长依赖于植物体内的通气。植物激素乙烯通过诱导通气组织的形成来帮助适应水涝，通气组织为氧气从芽到根尖的运输提供了低阻力途径。包括大麦在内的易涝作物在遭受涝渍胁迫后开始形成通气组织。但如果通气组织形成得不够快，内涝可能是致命的。在这里，我们调查了是否预处理大麦乙烯利，乙烯释放农药，可以提高其耐受性模拟内涝条件（使用停滞脱氧琼脂营养液）。在通气营养液中生长的大麦中，乙烯利处理促进了根尖通气组织的形成，并诱导了短而浅的根的发育。预处理大麦叶片还延迟了淹水引起的白化，并增加了淹水条件下的存活根尖的百分比。然而，预处理并没有显着增加鲜重或芽长。需要进一步研究优化乙烯利处理条件，以提高大麦在淹水条件下的产量。
ABSTRACT Root growth into hypoxic or anoxic waterlogged soil relies on internal aeration in plants. The plant hormone ethylene helps adapt to waterlogging by inducing the formation of aerenchyma, which provides a low-resistance pathway for the transport of oxygen from the shoot to the root apex. Waterlogging-susceptible crops including barley start to form aerenchyma after suffering waterlogging stress. But waterlogging can be fatal if aerenchyma formation is not fast enough. Here, we investigated whether pre-treating barley with ethephon, an ethylene-releasing agrochemical, could improve its tolerance to mimicked waterlogging conditions (using stagnant deoxygenated agar nutrient solution). In barley growing in aerated nutrient solution, ethephon treatment enhanced aerenchyma formation at the root tips and induced the development of shorter and shallower roots. Pre-treating barley leaves also delayed waterlogging-caused whiting and increased the percentages of viable root-tips under waterlogging conditions. However, the pretreatment did not noticeably increase fresh weight or shoot length. Further studies are needed to optimize ethephon treatment conditions to improve barley production under waterlogged conditions.