Ethylene and reactive oxygen species are involved in root aerenchyma formation and adaptation of wheat seedlings to oxygen-deficient conditions.
Ethylene and reactive oxygen species are involved in root aerenchyma formation and adaptation of wheat seedlings to oxygen-deficient conditions.
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DOI：
10.1093/jxb/ert371
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发表时间：
2014-01
影响因子：
6.9
通讯作者：
Nakazono M
中科院分区：
文献类型：
--
作者：
Yamauchi T;Watanabe K;Fukazawa A;Mori H;Abe F;Kawaguchi K;Oyanagi A;Nakazono M
乙烯介导的活性氧信号转导参与了小麦幼苗对淹水条件的适应性反应，它通过控制根中溶生型透气组织的形成和乙醇发酵酶基因的表达，使植物暴露在低氧条件下，通过增强根中的糖酵解和发酵活性，极大地提高了小麦幼苗的耐缺氧能力。乙烯也可能参与这些适应性反应，因为在低氧条件下，它在根中的合成增加。本文报道了用乙烯前体1-氨基环丙烷羧酸(ACC)处理小麦幼苗，通过增加根中乙醇发酵酶、乙醇脱氢酶和丙酮酸脱羧酶基因的表达，促进了乙烯在小麦幼苗根中的积累，并增强了小麦幼苗对缺氧条件的耐受性。在低氧条件下，ACC预处理可诱导根中溶生通风组织的形成，并可进一步诱导根的生长。ACC处理提高了3个编码呼吸爆发氧化酶同源物的基因(NADPH氧化酶中gp91Phox的植物同源物)在幼苗根中的表达，这些基因在产生活性氧物种(ROS)中具有作用。ACC和NADPH氧化酶抑制剂二苯基碘正离子共同处理可部分抑制ACC诱导的反应。这些结果表明，乙烯和ROS通过控制溶生型气孔组织的形成和乙醇发酵酶基因的表达，参与了小麦幼苗对缺氧条件的适应。
Ethylene-mediated reactive oxygen species signalling is involved in adaptive responses of wheat seedlings to waterlogged conditions through controlling formation of lysigenous aerenchyma and expression of genes encoding ethanol fermentation enzymes in roots Exposing plants to hypoxic conditions greatly improves their anoxic stress tolerance by enhancing the activities of glycolysis and fermentation in roots. Ethylene may also be involved in these adaptive responses because its synthesis is increased in roots under hypoxic conditions. Here it is reported that pre-treatment of wheat seedlings with an ethylene precursor, 1-aminocyclopropanecarboxylic acid (ACC), enhanced accumulation of ethylene in the roots of wheat seedlings, and enhanced their tolerance of oxygen-deficient conditions through increasing the expression of genes encoding ethanol fermentation enzymes, alcohol dehydrogenase and pyruvate decarboxylase, in the roots. Lysigenous aerenchyma formation in root was induced by ACC pre-treatment and was further induced by growth under oxygen-deficient conditions. ACC pre-treatment increased the expression of three genes encoding respiratory burst oxidase homologue (a plant homologue of gp91phox in NADPH oxidase), which has a role in the generation of reactive oxygen species (ROS), in roots of seedlings. Co-treatment with ACC and an NADPH oxidase inhibitor, diphenyleneiodonium, partly suppressed the ACC-induced responses. These results suggest that ethylene and ROS are involved in adaptation of wheat seedlings to oxygen-deficient conditions through controlling lysigenous aerenchyma formation and the expression of genes encoding ethanol fermentation enzymes.
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