MADS1 maintains barley spike morphology at high ambient temperatures

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dc.contributor.authorLi, G.
dc.contributor.authorKuijer, H.N.J.
dc.contributor.authorYang, X.
dc.contributor.authorLiu, H.
dc.contributor.authorShen, C.
dc.contributor.authorShi, J.
dc.contributor.authorBetts, N.
dc.contributor.authorTucker, M.R.
dc.contributor.authorLiang, W.
dc.contributor.authorWaugh, R.
dc.contributor.authorBurton, R.A.
dc.contributor.authorZhang, D.
dc.date.issued2021
dc.description.abstractTemperature 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.
dc.description.statementofresponsibilityGang Li, Hendrik N. J. Kuijer, Xiujuan Yang, Huiran Liu, Chaoqun Shen, Jin Shi ... et al.
dc.identifier.citationNature Plants, 2021; 7(8):1-31
dc.identifier.doi10.1038/s41477-021-00957-3
dc.identifier.issn2055-026X
dc.identifier.issn2055-0278
dc.identifier.orcidYang, X. [0000-0001-9340-3551]
dc.identifier.orcidShen, C. [0000-0001-6247-8390]
dc.identifier.orcidBetts, N. [0000-0002-3345-8160]
dc.identifier.orcidTucker, M.R. [0000-0003-4661-6700]
dc.identifier.orcidBurton, R.A. [0000-0002-0638-4709]
dc.identifier.orcidZhang, D. [0000-0003-3181-9812]
dc.identifier.urihttp://hdl.handle.net/2440/131476
dc.language.isoen
dc.publisherSpringer Science and Business Media
dc.relation.granthttp://purl.org/au-research/grants/arc/DP170103352
dc.rights© 2021, The Author(s), under exclusive licence to Springer Nature Limited
dc.source.urihttps://doi.org/10.1038/s41477-021-00957-3
dc.subjectHordeum
dc.subjectCrops, Agricultural
dc.subjectMADS Domain Proteins
dc.subjectGene Expression Regulation, Plant
dc.subjectGenotype
dc.subjectPhenotype
dc.subjectGenes, Plant
dc.subjectAustralia
dc.subjectHot Temperature
dc.subjectGenetic Variation
dc.subjectInflorescence
dc.titleMADS1 maintains barley spike morphology at high ambient temperatures
dc.typeJournal article
pubs.publication-statusPublished

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