Journal
JOURNAL OF PLANT GROWTH REGULATION
Volume 22, Issue 2, Pages 134-140Publisher
SPRINGER-VERLAG
DOI: 10.1007/s00344-003-0028-5
Keywords
gibberellin; DELLA proteins; GAI/RGA/RGL1/RGL2/RHT/d8; internode elongation; seed germination; signal transduction; proteasome
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Gibberellin (GA) is a classical plant hormone involved in many aspects of plant growth and development. A family of five homologs called the DELLA proteins, comprised of GAL RGA, RGL1, RGL2 and RGL3, were recently found to act as critical GA signal mediators in Arabidopsis. Reports have shown that GAI and RGA are coupled together to repress stem elongation growth whereas RGL2 is a major negative regulator of seed germination. GA down-regulates DELLA proteins through protein degradation likely via the proteasome pathway. The conserved and functionally important DELLA domain is responsible for protein stability in response to GA.
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