1. Subfunctionalisation and self-repression of duplicated E1 homologues finetunes soybean flowering and adaptation
- Author
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Chao Fang, Zhihui Sun, Shichen Li, Tong Su, Lingshuang Wang, Lidong Dong, Haiyang Li, Lanxin Li, Lingping Kong, Zhiquan Yang, Xiaoya Lin, Alibek Zatybekov, Baohui Liu, Fanjiang Kong, and Sijia Lu
- Subjects
Science - Abstract
Abstract 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.
- Published
- 2024
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