Subfunctionalisation and self-repression of duplicated E1 homologues finetunes soybean flowering and adaptation
Fang C. Sun Z. Li S. Su T. Wang L. Dong L. Li H. Li L. Kong L. Yang Z. Lin X. Zatybekov A. Liu B. Kong F. Lu S.
December 2024Nature Research
Nature Communications
2024#15Issue 1
Soybean is a photoperiod-sensitive staple crop. Its photoperiodic flowering has major consequences for latitudinal adaptation and grain yield. Here, we identify and characterise a flowering locus named Time of flower 4b (Tof4b), which encodes E1-Like b (E1Lb), a homologue of the key soybean floral repressor E1. Tof4b protein physically associates with the promoters of two FLOWERING LOCUS T (FT) genes to repress their transcription and delay flowering to impart soybean adaptation to high latitudes. Three E1 homologues undergo subfunctionalisation and show differential subcellular localisation. Moreover, they all possess self-repression capability and each suppresses the two homologous counterparts. Subfunctionalisation and the transcriptional regulation of E1 genes collectively finetune flowering time and high-latitude adaptation in soybean. We propose a model for the functional fate of the three E1 genes after the soybean whole-genome duplication events, refine the molecular mechanisms underlying high-latitude adaption, and provide a potential molecular-breeding resource.
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Guangdong Provincial Key Laboratory of Plant Adaptation and Molecular Design, Innovative Center of Molecular Genetics and Evolution, School of Life Sciences, Guangzhou University, Guangzhou Higher Education Mega Center, Guangzhou, China
The Innovative Academy of Seed Design, Key Laboratory of Soybean Molecular Design Breeding, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin, China
College of Agronomy and Biotechnology, China Agricultural University, Beijing, China
Laboratory of Molecular Genetics, Institute of Plant Biology and Biotechnology, Almaty, Kazakhstan
Guangdong Provincial Key Laboratory of Plant Adaptation and Molecular Design
The Innovative Academy of Seed Design
College of Agronomy and Biotechnology
Laboratory of Molecular Genetics
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