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Cryptochrome 1 contributes to blue-light sensing in pea


Platten, JD and Foo, E and Elliott, RC and Hecht, VFG and Reid, JB and Weller, JL, Cryptochrome 1 contributes to blue-light sensing in pea, Plant Physiology, 139, (3) pp. 1472-1482. ISSN 0032-0889 (2005) [Refereed Article]

DOI: doi:10.1104/pp.105.067462


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 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. © 2005 American Society of Plant Biologists.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Environmentally sustainable plant production
Objective Field:Environmentally sustainable plant production not elsewhere classified
UTAS Author:Platten, JD (Mr Damien Platten)
UTAS Author:Foo, E (Associate Professor Eloise Foo)
UTAS Author:Elliott, RC (Dr Robert Elliott)
UTAS Author:Hecht, VFG (Dr Valerie Hecht)
UTAS Author:Reid, JB (Professor Jim Reid)
UTAS Author:Weller, JL (Associate Professor Jim Weller)
ID Code:36121
Year Published:2005
Web of Science® Times Cited:40
Deposited By:Plant Science
Deposited On:2005-08-01
Last Modified:2006-05-09

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