American Society of Plant Biologists;United States: Oxford University Press (OUP)
摘要:
摘要： Germination is a unique developmental transition from metabolically quiescent seed to actively growing seedling that requires an ensemble of hydrolases for coordinated nutrient mobilization to support heterotrophic growth until autotrophic photosynthesis is established. This study reveals two crucial transcription factors, MYBS1 and MYBGA, present in rice (Oryza sativa) and barley (Hordeum vulgare), that function to integrate diverse nutrient starvation and gibberellin (GA) signaling pathways during germination of cereal grains. Sugar represses but sugar starvation induces MYBS1 synthesis and its nuclear translocation. GA antagonizes sugar repression by enhancing conuclear transport of the GA-inducible MYBGA with MYBS1 and the formation of a stable bipartite MYB-DNA complex to activate the α-amylase gene. We further discovered that not only sugar but also nitrogen and phosphate starvation signals converge and interconnect with GA to promote the conuclear import of MYBS1 and MYBGA, resulting in the expression of a large set of GA-inducible but functionally distinct hydrolases, transporters, and regulators associated with mobilization of the full complement of nutrients to support active seedling growth in cereals. 其他題名： Plant Cell 出版者： United States: Oxford University Press (OUP) 出版日期： 2012-07-01 出處： The Plant Cell, 2012-07, Vol.24 (7), p.2857-2873 資源來源： Agricultural & Environmental Science Collection 版權： 2012 American Society of Plant Biologists 版權： Copyright American Society of Plant Biologists Jul 2012 版權： 2012 American Society of Plant Biologists. All rights reserved. 2012 識別號： ISSN: 1040-4651 識別號： ISSN: 1532-298X 識別號： EISSN: 1532-298X 識別號： DOI: 10.1105/tpc.112.097741 識別號： PMID: 22773748
