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Article: Control of gibberellin levels and gene expression during de-etiolation in pea
- Article from:
- Plant Physiology
- Article date:
- February 1, 2002
- Author:
CopyrightCopyright American Society of Plant Physiologists Feb 2002. Provided by ProQuest LLC. (Hide copyright information)
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Control of Gibberellin Levels and Gene Expression during De-Etiolation in Pea'
Gibberellin A, (GA^sub 1^) levels drop significantly in wild-type pea (Pisum sativum) plants within 4 h of exposure to red, blue, or far-red light. This response is controlled by phytochrome A (phyA) (and not phyB) and a blue light receptor. GA, levels are increased in response to 4 h of red light, whereas the levels of GA^sub 19^, GA^sub 20^, and GA^sub 29^, do not vary substantially. Red light appears to control GA^sub 1^ levels by down-regulating the expression of Mendel's LE (PsGA3oxl) gene that controls the conversion of GA^sub 20^, to GA^sub 1^ and by up-regulating PsGA2ox2, which codes for a GA 2-oxidase ...
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