Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/131476
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Type: Journal article
Title: MADS1 maintains barley spike morphology at high ambient temperatures
Author: Li, G.
Kuijer, H.N.J.
Yang, X.
Liu, H.
Shen, C.
Shi, J.
Betts, N.
Tucker, M.R.
Liang, W.
Waugh, R.
Burton, R.A.
Zhang, D.
Citation: Nature Plants, 2021; 7(8):1-31
Publisher: Springer Science and Business Media
Issue Date: 2021
ISSN: 2055-026X
2055-0278
Statement of
Responsibility: 
Gang Li, Hendrik N. J. Kuijer, Xiujuan Yang, Huiran Liu, Chaoqun Shen, Jin Shi ... et al.
Abstract: Temperature stresses affect plant phenotypic diversity. The developmental stability of the inflorescence, required for reproductive success, is tightly regulated by the interplay of genetic and environmental factors. However, the mechanisms underpinning how plant inflorescence architecture responds to temperature are largely unknown. We demonstrate that the barley SEPALLATA MADS-box protein HvMADS1 is responsible for maintaining an unbranched spike architecture at high temperatures, while the loss-of-function mutant forms a branched inflorescence-like structure. HvMADS1 exhibits increased binding to target promoters via A-tract CArG-box motifs, which change conformation with temperature. Target genes for high-temperature-dependent HvMADS1 activation are predominantly associated with inflorescence differentiation and phytohormone signalling. HvMADS1 directly regulates the cytokinin-degrading enzyme HvCKX3 to integrate temperature response and cytokinin homeostasis, which is required to repress meristem cell cycle/division. Our findings reveal a mechanism by which genetic factors direct plant thermomorphogenesis, extending the recognized role of plant MADS-box proteins in floral development.
Keywords: Hordeum
Crops, Agricultural
MADS Domain Proteins
Gene Expression Regulation, Plant
Genotype
Phenotype
Genes, Plant
Australia
Hot Temperature
Genetic Variation
Inflorescence
Rights: © 2021, The Author(s), under exclusive licence to Springer Nature Limited
DOI: 10.1038/s41477-021-00957-3
Grant ID: http://purl.org/au-research/grants/arc/DP170103352
Appears in Collections:Agriculture, Food and Wine publications
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