ETHYLENE AS A POSSIBLE MEDIATOR OF LIGHT-INDUCED INHIBITION OF ROOT-GROWTH
ETHYLENE AS A POSSIBLE MEDIATOR OF LIGHT-INDUCED INHIBITION OF ROOT-GROWTH
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DOI：
10.1111/j.1399-3054.1988.tb09170.x
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发表时间：
1988-03-01
影响因子：
6.4
通讯作者：
BOLLMARK, M
中科院分区：
文献类型：
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作者：
ELIASSON, L;BOLLMARK, M
豌豆幼苗（Pisum sativum L.）CV. Weibull ′ s Marma）研究了乙烯在光诱导抑制根伸长中的作用。用白色光照射根抑制根伸长40-50%，并增加根的乙烯产生约4倍。我们的主要方法是使用外源1-氨基环丙烷-1-羧酸（ACC），在生长溶液中提供，监测乙烯生产的根独立的光处理。离体根尖的乙烯产量随着ACC浓度的增加而增加。在用0.1 μ M ACC处理的暗生长根中乙烯产生的速率与由光照引起的乙烯产生的速率相似。低ACC浓度（0.01-0.1 μ M）降低了根伸长的速率，尤其是在黑暗中生长的幼苗中，并且0.1 μ M ACC抑制伸长的程度与光照大致相同。在光照下，根弯曲，部分斜向生长。该作用也被0.1 μ M ACC处理刺激。在1 μ M和更高浓度下，ACC几乎完全抑制根生长，并在光照和黑暗中引起根尖的明显弯曲。乙烯合成和作用的抑制剂部分抵消了光对根伸长的抑制。这些观察结果表明，乙烯生产的增加所造成的光至少是部分负责减少光暴露的根的生长。
Pea seedlings (Pisum sativum L. cv. Weibull''s Marma) were used to investigate the possible role of ethylene in light-induced inhibition of root elongation. Illumination of the roots with white light inhibited root elongation by 40-50% and increased ethylene production by the roots about 4-fold. Our main approach was to use exogenous 1-aminocyclopropane-1-carboxylic acid (ACC), supplied in the growth solution, to monitor ethylene production of the roots independent of light treatment. Ethylene production of excised root tips increased with increasing ACC concentrations. The rate of ethylene production in dark-grown roots treated with 0.1 .mu.M ACC was similar to that caused by illumination. Low ACC concentrations (0.01-0.1 .mu.M) decreased the rate of root elongation, especially in seedlings grown in the dark, and 0.1 .mu.M ACC inhibited elongation to about the same extent as light. In light the roots curved and grew partly plagiogravitropically. This effect was also stimulated by the 0.1 .mu.M ACC treatment. At 1 .mu.M and higher concentrations, ACC inhibited root growth almost completely and caused conspicuous curvatures of the root tips both in light and darkness. Inhibitors of ethylene synthesis and action partially counteracted the inhibition of root elongation caused by light. These observations suggest that the increase in ethylene production caused by light is at least partly responsible for the decreased growth of light-exposed roots.