Photosynthetic photon flux density and phytochrome B interact to regulate branching in Arabidopsis

Plant, Cell & Environment
Hongwen SuScott A Finlayson

Abstract

Branching is regulated by environmental signals including phytochrome B (phyB)-mediated responses to the ratio of red to far red light. While the mechanisms associated with phytochrome regulation of branching are beginning to be elucidated, there is little information regarding other light signals, including photosynthetic photon flux density (PPFD) and how it influences phytochrome-mediated responses. This study shows that Arabidopsis (Arabidopsis thaliana) branching is modified by both varying PPFD and phyB status and that significant interactions occur between these variables. While phyB deficiency decreased branching when the PPFD was low, the effect was suppressed by high PPFD and some branching aspects were actually promoted. Photosynthesis measurements showed that PPFD may influence branching in phyB-deficient plants at least partially through a specific signalling pathway rather than directly through energy effects on the shoot. The expression of various genes in unelongated buds of phyB-deficient and phyB-sufficient plants grown under high and low PPFD demonstrated potential roles for several hormones, including auxin, cytokinins and ABA, and also showed imperfect correlation between expression of the branching regulat...Continue Reading

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Citations

Aug 10, 2013·Plant Physiology·Srirama Krishna ReddyScott A Finlayson
Feb 5, 2014·Plant Physiology·Srirama Krishna Reddy, Scott A Finlayson
May 15, 2012·The Arabidopsis Book·Jorge J Casal
Feb 4, 2014·Journal of Plant Physiology·Pierre-Maxime FuretAlain Vian
Jan 1, 2014·Plants·Nathalie LeducSoulaiman Sakr
Aug 4, 2012·Trends in Plant Science·Tesfamichael H KebromE Jean Finnegan
Dec 17, 2014·Plant, Cell & Environment·Tesfamichael H Kebrom, John E Mullet
Jan 30, 2015·Frontiers in Plant Science·Catherine RameauSoulaiman Sakr
Feb 1, 2018·Journal of Experimental Botany·Chuanlin ZhengEtti Or
Jan 5, 2018·Journal of Experimental Botany·Hiromu Kameoka, Junko Kyozuka
Nov 5, 2019·Frontiers in Plant Science·Anne SchneiderJessica Bertheloot
Feb 28, 2019·Frontiers in Plant Science·Ming WangSoulaiman Sakr
Sep 21, 2017·Frontiers in Plant Science·Chuanwei Yang, Lin Li
Apr 10, 2014·Plant Signaling & Behavior·Srirama Krishna ReddyScott A Finlayson

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