CONSTANS-LIKE 7 regulates branching and shade avoidance response in Arabidopsis.

Abstract:

:Branching is an important trait of plant development regulated by environmental signals. Phytochromes in Arabidopsis mediate branching in response to the changes in the red light:far-red light ratio (R:FR), the mechanisms of which are still elusive. Here it is shown that overexpression of CONSTANS-LIKE 7 (COL7) results in an abundant branching phenotype which could be efficiently suppressed by shade or a simulated shade environment (low R:FR). Moreover, col7 mutants develop shorter hypocotyls and COL7 overexpression lines develop longer hypocotyls in comparison with the wild type in low R:FR, indicating that COL7 acts as an enhancer of the shade avoidance response. In shade or transient low R:FR, transcriptional and post-transcriptional expression levels of COL7 are up-regulated and positively associated with rapid mRNA accumulation of PHYTOCHROME INTERACTING FACTOR 3-LIKE 1 (PIL1), a marker gene of shade avoidance syndrome (SAS). Taken together, the results suggest a dual role for COL7 which promotes branching in high R:FR conditions but enhances SAS in low R:FR conditions.

journal_name

J Exp Bot

authors

Wang H,Zhang Z,Li H,Zhao X,Liu X,Ortiz M,Lin C,Liu B

doi

10.1093/jxb/ers376

subject

Has Abstract

pub_date

2013-02-01 00:00:00

pages

1017-24

issue

4

eissn

0022-0957

issn

1460-2431

pii

ers376

journal_volume

64

pub_type

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