XYLEM TRANSPORT OF 1-AMINOCYCLOPROPANE-1-CARBOXYLIC ACID, AN ETHYLENE PRECURSOR, IN WATERLOGGED TOMATO PLANTS
XYLEM TRANSPORT OF 1-AMINOCYCLOPROPANE-1-CARBOXYLIC ACID, AN ETHYLENE PRECURSOR, IN WATERLOGGED TOMATO PLANTS
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DOI：
10.1104/pp.65.2.322
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发表时间：
1980-01-01
期刊：
影响因子：
7.4
通讯作者：
YANG, SF
中科院分区：
文献类型：
--
作者：
BRADFORD, KJ;YANG, SF
涝渍导致芽中乙烯合成增加，导致叶柄上上。有证据表明，信号在厌氧根中合成，并传输到芽，刺激乙烯合成。实验数据显示，乙烯的直接前体 1-氨基环丙烷-1-羧酸 (ACC) 充当信号。从去顶番茄植株（L. esculentum Mill. cv. VFN8）收集木质部汁液。通过灵敏且特异的测定对树液中的 ACC 进行定量，并通过纸色谱法验证其初步化学特性。根部和木质部汁液中的 ACC 水平因淹水或根部厌氧而显着增加。水淹植物木质部汁液中 ACC 的出现先于乙烯产量的增加和外生生长，两者密切相关。工厂被淹然后排水显示 ACC 通量和乙烯合成率同时快速下降。 ACC 通过切下的番茄枝茎供应，其浓度与木质部汁液中的浓度相当，导致上位并增加乙烯产量。 ACC 可在厌氧根中合成并运输至芽，在芽中很容易转化为乙烯。
Waterlogging causes an increase in ethylene synthesis in the shoot which results in petiole epinasty. Evidence has suggested that a signal is synthesized in the anaerobic roots and transported to the shoot where it stimulates ethylene synthesis. Experimental data are presented showing that 1-aminocyclopropane-1-carboxylic acid (ACC), the immediate precursor of ethylene, serves as the signal. Xylem sap was collected from detopped tomato plants (L. esculentum Mill. cv. VFN8). ACC in the sap was quantitated by a sensitive and specific assay, and its tentative chemical identity verified by paper chromatography. ACC levels in both roots and xylem sap increased markedly in response to waterlogging or root anaerobiosis. The appearance of ACC in the xylem sap of flooded plants preceded both the increase in ethylene production and epinastic growth, which were closely correlated. Plants flooded and then drained showed a rapid, simultaneous drop in ACC flux and ethylene synthesis rate. ACC supplied through the cut stem of tomato shoots at concentrations comparable to those found in xylem sap caused epinasty and increased ethylene production. ACC may be synthesized in the anaerobic root and transported to the shoot where it is readily converted to ethylene.