Plant Physiology Preview
Published on October 21, 2005; 10.1104/pp.105.067462
Received June 28, 2005
Returned for revision September 8, 2005
Accepted September 8, 2005
Cryptochrome 1 Contributes to Blue-Light Sensing in Pea
J. Damien Platten , Eloise Foo , Robert C. Elliott , Valérie Hecht , James B. Reid , and James L. Weller *
School of Plant Science, University of Tasmania, Hobart, Tasmania 7001, Australia
* Corresponding author; email: jim.weller{at}utas.edu.au.
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.
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