Abstract
The phytohormones ethylene and gibberellin (GA) act synergistically to regulate a diversity of plant growth and development processes. In the presence of ethylene, the signaling mediated by ethylene receptors and CTR1 (CONSTITUTIVE TRIPLE RESPONSE1) is switched off, while EIN2 (ETHYLENE INSENSITIVE2) and EIN3 (ETHYLENE INSENSITIVE3) together mediate ethylene signaling. GA promotes plant growth by facilitating the degradation of the DELLA proteins, a family of nuclear growth repressors. Although the existence of crosstalk between ethylene and GA in the context of growth and development has long been known, its molecular basis is only now beginning to be understood. Both the synthesis and the signaling pathways controlled by ethylene and GA are reciprocally regulated. In this chapter, recent advances in the understanding of how they regulate germination, root and hypocotyl growth, apical hook development, and flowering initiation are reviewed. The significance of ethylene–GA crosstalk in the plant response to abiotic stress is described.
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Fu, X., Gao, X., Liu, X. (2015). Integration of Ethylene and Gibberellin Signaling. In: Wen, CK. (eds) Ethylene in Plants. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9484-8_9
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