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Cryptochrome 1 Contributes to Blue-Light Sensing in Pea

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Platten, JD and Foo, E and Elliott, RC and Hecht, VFG and Reid, JB and Weller, JL (2005) Cryptochrome 1 Contributes to Blue-Light Sensing in Pea. Plant Physiology, 139. pp. 1472-1482. ISSN 0032-0889

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Abstract

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 photolyasehomologous 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 darkgrown 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.

Item Type: Article
Journal or Publication Title: Plant Physiology
Page Range: pp. 1472-1482
ISSN: 0032-0889
Identification Number - DOI: 10.1104/pp.105.067462
Additional Information: Copyright © 2005 by the American Society of Plant Biologists
Date Deposited: 19 Aug 2011 00:12
Last Modified: 18 Nov 2014 04:21
URI: http://eprints.utas.edu.au/id/eprint/11574
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