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Plant Physiology:生物钟基因TOC1作用于野生烟草干旱胁迫下的适应性

已有 501 次阅读 2019-6-11 19:46 |个人分类:每日摘要|系统分类:论文交流

The clock gene TOC1 in shoots, not roots, determines fitness of Nicotiana attenuata under drought

First author: Henrique A Valim; Affiliations: Max Planck Institute for Chemical Ecology (马克斯普朗克化学生态学研究所): Jena, Germany

Corresponding author: Ian T Baldwin

The highly conserved core circadian clock component TIMING OF CAB EXPRESSION 1 (TOC1) contextualizes environmental stress responses in plants, for example by gating abscisic acid (ABA) signaling and suppressing thermoresponsive growth. Selective interaction of TOC1 with PHYTOCHROME B (PHYB) under far-red-enriched light suggests a connection between circadian gating of light responses and sensitivity to ABA, an important regulator of growth and stress responses, including under drought. However, the fitness consequences of TOC1 function, particularly in the root, are poorly understood. Here, we used the desert annual, Nicotiana attenuata, to investigate the function of TOC1 in shoots and roots for maintaining fitness under drought, in both field and glasshouse experiments. Despite marked decreases in leaf water loss, TOC1-deficient (irTOC1) lines failed to maintain fitness in response to drought stress as measured by total seed capsule production. Restoring TOC1 transcript levels in shoots via micrografting was sufficient to restore wild-type drought responses under field conditions. Microarrays identified a co-expression module in leaves strongly linking red and far-red light signaling to drought responses in a TOC1-dependent manner, but experiments with phytochrome-deficient lines revealed that the effects of TOC1 deficiency under drought cannot be attributed to changes in red/far-red light perception alone. Taken together, these results elucidate the sophisticated, tissue-dependent role of the circadian clock in maintaining fitness in the face of long-term abiotic stresses such as drought.



通讯:Ian T. Baldwin (https://www.ice.mpg.de/ext/index.php?id=hopa&pers=iaba2016)



doi: https://doi.org/10.1104/pp.19.00286

Journal: Plant Physiology

First Published: June 10, 2019


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