Cryptochrome 1 Contributes to Blue-Light Sensing in Pea

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  • J. Damien Platten
    School of Plant Science, University of Tasmania, Hobart, Tasmania 7001, Australia
  • Eloise Foo
    School of Plant Science, University of Tasmania, Hobart, Tasmania 7001, Australia
  • Robert C. Elliott
    School of Plant Science, University of Tasmania, Hobart, Tasmania 7001, Australia
  • Valérie Hecht
    School of Plant Science, University of Tasmania, Hobart, Tasmania 7001, Australia
  • James B. Reid
    School of Plant Science, University of Tasmania, Hobart, Tasmania 7001, Australia
  • James L. Weller
    School of Plant Science, University of Tasmania, Hobart, Tasmania 7001, Australia

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<jats:title>Abstract</jats:title> <jats:p>Cryptochromes are widespread in higher plants but their physiological roles as blue-light photoreceptors have been examined in relatively few species. Screening in a phyA null mutant background has identified several blue-light response mutants in pea (Pisum sativum), including one that carries a substitution of a highly conserved glycine residue in the N-terminal photolyase-homologous domain of the pea CRY1 gene. Analyses of cry1, phyA, and phyB mutants show that all three photoreceptors contribute to seedling photomorphogenesis under high-irradiance blue light, whereas phyA is the main photoreceptor active under low irradiances. Triple phyA phyB cry1 mutants grown under high-irradiance blue light are indistinguishable from dark-grown wild-type plants in length and leaf expansion but show a small residual response to higher-irradiance white light. Monogenic cry1 mutants have little discernable phenotype at the seedling stage, but later in development are more elongated than wild-type plants. In addition, the loss of cry1 moderates the short-internode phenotype of older phyA mutants, suggesting an antagonism between phyA and cry1 under some conditions. Pea cry1 has a small inhibitory effect on flowering under long and short days. However, the phyA cry1 double mutant retains a clear promotion of flowering in response to blue-light photoperiod extensions, indicating a role for one or more additional blue-light photoreceptors in the control of flowering in pea.</jats:p>

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  • Plant Physiology

    Plant Physiology 139 (3), 1472-1482, 2005-10-21

    Oxford University Press (OUP)

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