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Determination of Photoreceptor Cell Spectral Sensitivity in an Insect Model from In Vivo Intracellular Recordings

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Cryptochrome 1 contributes to blue-light sensing in pea.

J Damien Platten¹, Eloise Foo, Robert C Elliott

¹School of Plant Science, University of Tasmania, Hobart, Tasmania 7001, Australia.

Plant Physiology

|October 26, 2005

Summary

Blue light photoreceptors cryptochromes (CRY1) and phytochromes (phyA, phyB) regulate pea seedling development. CRY1 and phytochromes interact antagonistically, influencing plant height and flowering time.

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Area of Science:

Plant Biology
Photomorphogenesis
Molecular Genetics

Background:

Cryptochromes are blue-light photoreceptors crucial for plant development.
Their specific roles are well-studied in few species, necessitating further investigation in others like pea (Pisum sativum).
Phytochromes (phyA, phyB) are also key photoreceptors involved in light responses.

Purpose of the Study:

To investigate the physiological roles of pea CRY1 in blue-light responses.
To understand the interactions between cryptochromes and phytochromes in pea photomorphogenesis and flowering.
To identify novel blue-light response mutants in pea.

Main Methods:

Screening of pea mutants in a phyA null background to identify blue-light response mutants.
Genetic analysis of single, double, and triple mutants (cry1, phyA, phyB).
Phenotypic characterization of mutants under various light conditions, focusing on seedling morphology and flowering time.

Main Results:

A cry1 mutant with a glycine substitution in the N-terminal domain was identified.
CRY1, phyA, and phyB collectively regulate seedling photomorphogenesis under high blue light; phyA is dominant under low light.
Triple mutants (phyA phyB cry1) under high blue light resemble dark-grown wild-type plants.
Monogenic cry1 mutants show later-stage elongation and moderate phyA-induced short-internode phenotypes, suggesting antagonism.
Pea cry1 slightly inhibits flowering, but other blue-light photoreceptors are involved in photoperiodic flowering control.

Conclusions:

Cryptochromes and phytochromes play significant, sometimes antagonistic, roles in pea photomorphogenesis and flowering.
CRY1 contributes to blue-light responses throughout plant development.
Additional blue-light photoreceptors beyond CRY1 are involved in regulating flowering time in response to photoperiods.