Short-term growth responses to ethylene in arabidopsis seedlings are EIN3/EIL1 independent
Short-term growth responses to ethylene in arabidopsis seedlings are EIN3/EIL1 independent
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DOI：
10.1104/pp.104.050393
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发表时间：
2004-10-01
期刊：
影响因子：
7.4
通讯作者：
Bleecker, AB
中科院分区：
文献类型：
--
作者：
Binder, BM;Mortimore, LA;Bleecker, AB
动力学研究表明，乙烯对黄化拟南芥幼苗下胚轴生长的抑制有两个阶段。阶段I是短暂的，而阶段II导致持续的生长抑制。EIN 2膜蛋白是乙烯生长抑制的第一和第二阶段所需的，而转录因子EIN 3和EIL 1是第二阶段所需的，而不是第一阶段。第一阶段持续时间不超过2 h。它对乙烯反应抑制剂1-甲基环丙烯的敏感性较低，对乙烯的敏感性高于第二相。第一阶段表现出对低浓度乙烯（小于或等于0.01穆尔L-1）的适应，乙烯加入后的相对不应期为5 h。提出了一个修正的信号转导模型，占两个阶段的生长抑制。
Kinetic studies indicate there are two phases to growth inhibition by ethylene for the hypocotyls of etiolated Arabidopsis seedlings. Phase I is transient, while phase II results in sustained growth inhibition. The EIN2 membrane protein is required for both the first and second phases of growth inhibition by ethylene, while the transcription factors EIN3 and EIL1 are required for the second phase but not the first phase. The first phase lasts no more than 2 h. It is less sensitive to the ethylene response inhibitor 1-methylcyclopropene and more sensitive to ethylene than the second phase. The first phase shows adaptation at low concentrations of ethylene (less than or equal to0.01 muL L-1) with a relative refractory period of 5 h after ethylene is added. A modified signal transduction model is proposed that accounts for the two phases of growth inhibition.