Title |
Characterization of photomorphogenic responses and signaling cascades controlled by phytochrome‐A expressed in different tissues
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Published in |
New Phytologist, March 2016
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DOI | 10.1111/nph.13941 |
Pubmed ID | |
Authors |
Daniel Kirchenbauer, András Viczián, Éva Ádám, Zoltán Hegedűs, Cornelia Klose, Michael Leppert, Andreas Hiltbrunner, Stefan Kircher, Eberhard Schäfer, Ferenc Nagy |
Abstract |
The photoreceptor phytochrome A acts as a light-dependent molecular switch and regulates responses initiated by very low fluences of light (VLFR) and high fluences (HIR) of far-red light. PhyA is expressed ubiquitously, but how phyA signaling is orchestrated to regulate photomorphogenesis is poorly understood. To address this issue, we generated transgenic Arabidopsis thaliana phyA-201 mutant lines expressing the biologically active phyA-YFP photoreceptor in different tissues, and analyzed the expression of several reporter genes, including ProHY5:HY5-GFP and Pro35S:CFP-PIF1, and various FR-HIR-dependent physiological responses. We show that phyA action in one tissue is critical and sufficient to regulate flowering time and root growth; control of cotyledon and hypocotyl growth requires simultaneous phyA activity in different tissues; and changes detected in the expression of reporters are not restricted to phyA-containing cells. We conclude that FR-HIR-controlled morphogenesis in Arabidopsis is mediated partly by tissue-specific and partly by intercellular signaling initiated by phyA. Intercellular signaling is critical for many FR-HIR induced responses, yet it appears that phyA modulates the abundance and activity of key regulatory transcription factors in a tissue-autonomous fashion. |
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