Convergent Starvation Signals and Hormone Crosstalk in Regulating Nutrient Mobilization upon Germination in Cereals
| Autor: | Rong Hwei Yeh, Chung An Lu, Chin Feng Wu, Peng-Wen Chen, Su-May Yu, Shin Lon Ho, Ya Fang Hong, Lin Chih Yu, Tuan-Hua David Ho, Annlin Chao |
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| Rok vydání: | 2012 |
| Předmět: |
Nitrogen
Recombinant Fusion Proteins Green Fluorescent Proteins Nuclear Localization Signals Germination Plant Science Photosynthesis Models Biological Phosphates Plant Growth Regulators Gene Expression Regulation Plant Botany Sugar Transcription factor Research Articles Plant Proteins Cell Nucleus Oryza sativa biology food and beverages Biological Transport Hordeum Oryza Cell Biology biology.organism_classification Carbon Endosperm Gibberellins Cell biology Seedlings Seedling Mutation Seeds Gibberellin Hordeum vulgare alpha-Amylases Signal Transduction Transcription Factors |
| Zdroj: | The Plant Cell. 24:2857-2873 |
| ISSN: | 1532-298X 1040-4651 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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