The different growth responses of the Arabidopsis thaliana leaf blade and the petiole during shade avoidance are regulated by Photoreceptors and sugar
The different growth responses of the Arabidopsis thaliana leaf blade and the petiole during shade avoidance are regulated by Photoreceptors and sugar
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DOI：
10.1093/pcp/pci016
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发表时间：
2005-01-01
影响因子：
4.9
通讯作者：
Tsukaya, H
中科院分区：
文献类型：
--
作者：
Kozuka, T;Horiguchi, G;Tsukaya, H
在避阴反应过程中，叶片扩展受到抑制，叶柄伸长增强。本研究探讨了光感受器和糖在遮荫条件下叶片和叶柄分化生长中的作用。在研究的条件下，细胞扩张，而不是细胞分裂，发挥了重要作用，在差异叶生长。叶片中增强的细胞扩增与倍性水平的增加相关，而在黑暗条件下在叶柄中刺激细胞伸长而不增加倍性水平。光敏色素，隐花色素和向光性突变体的分析表明，光敏色素和隐花色素专门调节叶片和叶柄在阴凉处的对比生长模式。研究了光同化蔗糖对叶片和叶柄生长的影响，结果表明蔗糖的促生长作用高度依赖于光照条件。脱落酸缺乏和糖不敏感突变体的叶片在蓝光下不展开，而在红光下正常展开。这些结果表明，在叶片和叶柄的差异光形态建成的控制中，光信号的调节和对糖的响应的调制都是重要的。
During the shade-avoidance response, leaf blade expansion is inhibited and petiole elongation is enhanced. In this study, we examined the roles of photoreceptors and sugar on the differential growth of the leaf blade and petiole in shade conditions. Under the conditions examined, cell expansion, not cell division, played a major role in the differential leaf growth. The enhanced cell expansion in the leaf blade is associated with an increase in the ploidy level, whereas cell elongation was stimulated in the petiole in dark conditions without an increase in the ploidy level. Analysis of phytochrome, cryptochrome and phototropin mutants revealed that phytochromes and cryptochromes specifically regulate the contrasting growth patterns of the leaf blade and petiole in shade. Examination of the effects of photo-assimilated sucrose on the growth of the leaf blade and petiole revealed growth-pro motional effects of sucrose that are highly dependent on the light conditions. The leaf blades of abscisic acid-deficient and sugar-insensitive mutants did not expand in blue light, but expanded normally in red light. These results suggest that both the regulation of light signals and the modulation of responses to sugar are important in the control of the differential photomorphogenesis of the leaf blade and petiole.