Ethylene is required in tobacco to successfully compete with proximate neighbours

被引:120
作者
Pierik, R
Visser, EJW
De Kroon, H
Voesenek, LACJ
机构
[1] Univ Utrecht, Dept Plant Ecophysiol, NL-3584 CA Utrecht, Netherlands
[2] Univ Nijmegen, Dept Expt Plant Ecol, NL-6525 ED Nijmegen, Netherlands
关键词
Nicotiana tabacum; competition; ethylene-insensitivity; leaf angle; neighbour signalling; phytochrome; red/far-red ratio; shade avoidance; stem elongation;
D O I
10.1046/j.1365-3040.2003.01045.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Plants sense neighbours even before these cause a decrease in photosynthetic light availability. Light reflected by proximate neighbours signals a plant to adjust growth and development, in order to avoid suppression by neighbour plants. These phenotypic changes are known as the shade-avoidance syndrome and include enhanced shoot elongation and more upright-positioned leaves. In the present study it was shown that these shade-avoidance traits in tobacco (Nicotiana tabacum) are also induced by low concentrations of ethylene. Furthermore, it was shown that transgenic plants, insensitive to ethylene, have a delayed appearance of shade-avoidance traits. The increase in both leaf angles and stem elongation in response to neighbours are delayed in ethylene-insensitive plants. These data show that ethylene is an important component in the regulation of neighbour-induced, shade-avoidance responses. Consequently, ethylene-insensitive plants lose competition with wild-type neighbours, demonstrating that sensing of ethylene is required for a plant to successfully compete for light.
引用
收藏
页码:1229 / 1234
页数:6
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