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Abstract

The theory that bioactive gibberellins (GAs) act as inhibitors of inhibitors of plant growth was based originally on the slender pea (Pisum sativum) mutant (genotype la cry-s), but the molecular nature of this mutant has remained obscure. Here we show that the genes LA and CRY encode DELLA proteins, previously characterized in other species (Arabidopsis [Arabidopsis thaliana] and several grasses) as repressors of growth, which are destabilized by GAs. Mutations la and cry-s encode nonfunctional proteins, accounting for the fact that la cry-s plants are extremely elongated, or slender. We use the la and cry-s mutations to show that in roots, DELLA proteins effectively promote the expression of GA synthesis genes, as well as inhibit elongation. We show also that one of the DELLA- regulated genes is a second member of the pea GA 3-oxidase family, and that this gene appears to play a major role in pea roots

Item Type:	Article
Authors/Creators:	Weston, DE and Elliott, RC and Lester, DR and Rameau, C and Reid, JB and Murfet, IC and Ross, JJ
Journal or Publication Title:	Plant Physiology
ISSN:	0032-0889
DOI / ID Number:	10.1104/pp.108.115808
Additional Information:	Copyright © 2008 American Society of Plant Biologists
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