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Planta. 2007 Jul;226(2):485-98. Epub 2007 Mar 10.

Reciprocal influence of ethylene and gibberellins on response-gene expression in Arabidopsis thaliana.

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  • 1Unit Plant Hormone Signalling and Bio-imaging, Department of Molecular Genetics, Ghent University, K.L. Ledeganckstraat 35, 9000 Ghent, Belgium.

Abstract

The complexity of hormonal responses and their functional overlap support the presence of an intensive cross-talk between hormone signalling pathways. A detailed analysis of responses induced by ethylene and gibberellin (GA) in a GA-insensitive mutant (gai), an ethylene-resistant mutant (etr1-3), the gai etr1-3 double-mutant, and in wild-type Arabidopsis thaliana plants, revealed multiple interactions between ethylene and GA signal transduction pathways. Ethylene insensitive mutants and wild-type plants treated with 1-methylcyclopropene (1-MCP), an ethylene perception inhibitor, displayed a stronger responsiveness of genes differentially regulated by GA. In addition, microarray-analysis showed that the GA-response in an ethylene-insensitive background is different from that in the wild-type, confirming the importance of ethylene in a plant's response towards GA. In this paper, we present a number of genes with an altered response-pattern as a direct consequence of cross-talk between ethylene and GA.

PMID:
17351788
DOI:
10.1007/s00425-007-0499-x
[PubMed - indexed for MEDLINE]
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