Involvement of Ethylene in Gravity-Regulated Peg Development in Cucumber Seedling
Involvement of Ethylene in Gravity-Regulated Peg Development in Cucumber Seedling
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乙烯参与黄瓜幼苗重力调节钉发育
DOI：
10.1093/oxfordjournals.pcp.a077496
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
H. Suge
中科院分区：
文献类型：
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作者：
Hideyuki Takahashi;H. Suge
黄瓜幼苗下胚轴和根的过渡区 (TR) 下侧的 Peg 发育受到两种乙烯生物合成抑制剂（氨基乙氧基乙烯基甘氨酸和氨基氧乙酸）以及乙烯作用抑制剂（硫代硫酸银）的抑制。这些乙烯抑制剂还抑制黄瓜下胚轴的羽状钩形成。当黄瓜种子在垂直位置或水平倾斜器上发芽时，幼苗表现出笔直生长，没有形成羽状钩，也没有形成突出的桩。在垂直位置发芽的幼苗中，外源IAA诱导了明显的钉状突起，而ACC和乙烯则刺激了TR区周围的整体肿胀，这与正常的钉明显不同。然而，在水平放置的幼苗中，由于用 5μl/升乙烯处理，钉发育更加明显。这些结果表明，钩区的高乙烯水平在挂钩发展中发挥了一定作用。正如 Witztum 和 Gersani (1975) 先前报道的那样，TIBA 是生长素运输的抑制剂，在 10−4M 时会抑制钉的发育，但稍低浓度的 TIBA 在水平生长的幼苗的下侧和上侧诱导出两个不同的钉。
Peg development on the lower side of the transition (TR) zone of the hypocotyl and the root in cucumber seedlings was inhibited by two inhibitors of ethylene biosynthesis, aminoethoxyvinyl glycine and aminooxyacetic acid, and by an inhibitor of ethylene action, Ag-thiosulfate. These ethylene inhibitors also inhibited plumular hook formation of the cucumber hypocotyl. When cucumber seeds were germinated in a vertical position or on a horizontal clinostat, the seedlings exhibited straight growth without formation of a plumular hook and failed to develop a protuberant peg. In the seedlings germinated in a vertical position, exogenous IAA induced a distinct peg-like protuberance, whereas ACC and ethylene stimulated overall swelling around the TR zone, which obviously differed from the normal peg. In horizontally placed seedlings, however, peg development was more pronounced due to treatment with 5μl/liter of ethylene. These results indicate that a high ethylene level in the hook region plays some role in peg development. TIBA, an inhibitor of auxin transport, at 10−4M inhibited peg development, as reported previously by Witztum and Gersani (1975), but a somewhat lower concentration of TIBA induced two distinct pegs, on both the lower and upper sides of horizontally grown seedlings.