Light intensity modulates the regulatory network of the shade avoidance response in Arabidopsis

Micha Hersch; Séverine Lorrain; Mieke de WitMartine TrevisanKarin LjungSven BergmannChristian Fankhauser

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Light intensity modulates the regulatory network of the shade avoidance response in Arabidopsis

机译：Light intensity modulates the regulatory network of the shade avoidance response in Arabidopsis

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Plants such as Arabidopsis thaliana respond to foliar shade and neighbors who may become competitors for light resources by elongation growth to secure access to unfiltered sunlight. Challenges faced during this shade avoidance response (SAR) are different under a light-absorbing canopy and during neighbor detection where light remains abundant. In both situations, elongation growth depends on auxin and transcription factors of the phytochrome interacting factor (PIF) class. Using a computational modeling approach to study the SAR regulatory network, we identify and experimentally validate a previously unidentified role for long hypocotyl in far red 1, a negative regulator of the PIFs. Moreover, we find that during neighbor detection, growth is promoted primarily by the production of auxin. In contrast, in true shade, the system operates with less auxin but with an increased sensitivity to the hormonal signal. Our data suggest that this latter signal is less robust, which may reflect a cost-to-robustness tradeoff, a system trait long recognized by engineers and forming the basis of information theory.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2014年第17期|6515-6520|共6页
作者
Micha Hersch; Séverine Lorrain; Mieke de WitMartine TrevisanKarin LjungSven BergmannChristian Fankhauser;
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作者单位

Swiss Institute of Bioinformatics, CH-1015 Lausanne, Switzerland;

Centre for Integrative Genomics, Faculty of Biology and Medicine, University of Lausanne, CH-1015 Lausanne, Switzerland;

Ume? Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 83 Ume?, Sweden;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
regulatory network model; auxin signaling; auxin biosynthesis; phytochrome;

Light intensity modulates the regulatory network of the shade avoidance response in Arabidopsis

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