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Unanticipated regulatory roles for Arabidopsis phytochromes revealed by null mutant analysis

机译:空突变体分析揭示了拟南芥植物色素的意外调控作用

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In view of the extensive literature on phytochrome mutants in the Ler accession of Arabidopsis, we sought to secure a phytochrome-null line in the same genetic background for comparative studies. Here we report the isolation and phenotypic characterization oi phyABCDE quintuple and phyABDE quadruple mutants in the Ler background. Unlike earlier studies, these lines possess a functional allele of FT permitting measurements of photoperiod-dependent flowering behavior. Comparative studies of both classes of mutants establish that phytochromes are dispensable for completion of the Arabidopsis life cycle under red light despite the lack of a transcriptomic response, and also indicate that phyC is nonfunctional in the absence of other phytochromes. Phytochrome-less plants can produce chlorophyll for photosynthesis under continuous red light yet require elevated flu-ence rates for survival. Unexpectedly, our analyses reveal both light-dependent and -independent roles for phytochromes to regulate the Arabidopsis circadian clock. The rapid transition of these mutants from vegetative to reproductive growth, as well as their insensitivity to photoperiod, establish a dual role for phytochromes to arrest and to promote progression of plant development in response to the prevailing light environment.
机译:鉴于拟南芥Ler入藏中有关植物色素突变体的大量文献,我们寻求在相同的遗传背景下确保植物色素无效系进行比较研究。在这里,我们报告了Ler背景下phyABCDE五倍体和phyABDE四倍体突变体的分离和表型特征。与早期研究不同,这些品系具有FT的功能等位基因,可以测量光周期依赖性开花行为。这两类突变体的比较研究表明,尽管缺乏转录组反应,但在红光下,植物色素对于完成拟南芥的生命周期是可有可无的,并且还表明在没有其他植物色素的情况下,phyC是无功能的。无植物色素的植物可以在连续的红光下产生叶绿素,以进行光合作用,但需要提高通量才能存活。出乎意料的是,我们的分析揭示了植物色素调节拟南芥生物钟的光依赖性和非依赖性作用。这些突变体从营养生长到生殖生长的快速转变,以及它们对光周期的不敏感性,为植物色素响应主要的光环境而阻止并促进植物发育的发展发挥了双重作用。

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