Green light augments far-red-light-induced shade response

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• 作者：Yihai Wang ; Tingting Zhang ; Kevin M. Folta
• 关键词：Shade avoidance ; Green light ; Phytochrome ; Cryptochrome ; Adaptation
• 刊名：Plant Growth Regulation
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：77
• 期：2
• 页码：147-155
• 全文大小：1,077 KB
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• 作者单位：Yihai Wang (1) (2)
  Tingting Zhang (1) (2)
  Kevin M. Folta (1) (2)
  
  1. Horticultural Sciences Department, University of Florida, 1301 Fifield Hall, PO Box 110690, Gainesville, FL, 32611, USA
  2. The Graduate Program in Plant Molecular and Cellular Biology, University of Florida, Gainesville, FL, 32611, USA
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Physiology
  
• 出版者：Springer Netherlands
• ISSN：1573-5087

文摘

Plants grown in shade exhibit changes in architecture and gene expression to best accommodate growth in photosynthetically challenging conditions. Adaptive changes in morphology include stem and petiole elongation and leaf hyponasty. These changes can be induced by low red to far-red ratio (R/Fr ratio) or by enrichment of green light relative to red and blue. In this report we demonstrate the relationship between far-red and green light in combination. Wild-type Arabidopsis thaliana plants were treated with a high and low R/Fr ratio background with or without supplemental green light. The addition of green light augmented the far-red response. Genetic analysis showed that the green effect operates independently of cry1, cry2, phot1, and phot2 receptors. Additive effects are not observed in phyA and phyB double mutants, but are observed in the phy signal transduction mutants pif4, pif5, pif7. The transcript levels of shade-associated genes (PIL1, ATHB2, and HFR1), are induced by low R/Fr ratio conditions and are reduced in the presence of green light, but not in phyAphyB mutants. The reduction in shade-related gene expression caused by supplementation of green light is inconsistent with the elongated petiole phenotype observed. These results suggest that phyA or phyB is required for the green light shade response, but they are not the main receptors because green light would increase the R/Fr ratio, leading to a non-shade phenotype. Keywords Shade avoidance Green light Phytochrome Cryptochrome Adaptation