Journal
PLANT CELL
Volume 15, Issue 12, Pages 2816-2825Publisher
AMER SOC PLANT BIOLOGISTS
DOI: 10.1105/tpc.015685
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Funding
- Biotechnology and Biological Sciences Research Council [BBS/E/J/00000583] Funding Source: Medline
- Biotechnology and Biological Sciences Research Council [BBS/E/J/00000583] Funding Source: researchfish
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Phytohormones regulate plant development via a poorly understood signal response network. Here, we show that the phytohormone ethylene regulates plant development at least in part via alteration of the properties of DELLA protein nuclear growth repressors, a family of proteins first identified as gibberellin (GA) signaling components. This conclusion is based on the following experimental observations. First, ethylene inhibited Arabidopsis root growth in a DELLA-dependent manner. Second, ethylene delayed the GA-induced disappearance of the DELLA protein repressor of ga1-3 from root cell nuclei via a constitutive triple response-dependent signaling pathway. Third, the ethylene-promoted apical hook structure of etiolated seedling hypocotyls was dependent on the relief of DELLA-mediated growth restraint. Ethylene, auxin, and GA responses now can be attributed to effects on DELLA function, suggesting that DELLA plays a key integrative role in the phytohormone signal response network.
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