Phytochrome D Acts in the Shade-Avoidance Syndrome in Arabidopsis by Controlling Elongation Growth and Flowering Time

Paul F. Devlin, Paul Robson, Samita R. Patel, Lynn Goosey, Robert A. Sharrock, Garry C. Whitelam

Research output: Contribution to journalArticlepeer-review

222 Citations (SciVal)

Abstract

Shade avoidance in higher plants is regulated by the action of multiple phytochrome (phy) species that detect changes in the red/far-red ratio (R/FR) of incident light and initiate a redirection of growth and an acceleration of flowering. The phyB mutant of Arabidopsis is constitutively elongated and early flowering and displays attenuated responses to both reduced R/FR and end-of-day far-red light, conditions that induce strong shade-avoidance reactions in wild-type plants. This indicates that phyB plays an important role in the control of shade avoidance. In Arabidopsis phyB and phyD are the products of a recently duplicated gene and share approximately 80% identity. We investigated the role played by phyD in shade avoidance by analyzing the responses of phyD-deficient mutants. Compared with the monogenic phyB mutant, the phyB-phyDdouble mutant flowers early and has a smaller leaf area, phenotypes that are characteristic of shade avoidance. Furthermore, compared with the monogenic phyB mutant, the phyB-phyDdouble mutant shows a more attenuated response to a reduced R/FR for these responses. Compared with the phyA-phyB double mutant, the phyA-phyB-phyD triple mutant has elongated petioles and displays an enhanced elongation of internodes in response to end-of-day far-red light. These characteristics indicate that phyD acts in the shade-avoidance syndrome by controlling flowering time and leaf area and that phyC and/or phyE also play a role
Original languageEnglish
Pages (from-to)909-915
Number of pages7
JournalPlant Physiology
Volume119
Issue number3
DOIs
Publication statusPublished - 01 Mar 1999

Keywords

  • Arabidopsis/genetics
  • Gene Duplication
  • Genes, Plant
  • Light
  • Mutation
  • Phenotype
  • Phytochrome/genetics

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