Journal
NATURE GENETICS
Volume 49, Issue 5, Pages 773-+Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ng.3819
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Funding
- National Natural Science Foundation of China [31430065, 31571686, 31371643, 31071445, 91531304, 31525018]
- National Key Research and Development Program [2016YFD0100401, 2016YFD0101900]
- Chinese Academy of Sciences [XDA08030108, XDA08020202]
- Open Foundation of the Key Laboratory of Soybean Molecular Design Breeding of Chinese Academy of Sciences
- Chinese Academy of Sciences
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Soybean is a major legume crop originating in temperate regions, and photoperiod responsiveness is a key factor in its latitudinal adaptation. Varieties from temperate regions introduced to lower latitudes mature early and have extremely low grain yields. Introduction of the long-juvenile (LJ) trait extends the vegetative phase and improves yield under short-day conditions, thereby enabling expansion of cultivation in tropical regions. Here we report the cloning and characterization of J, the major classical locus conferring the LJ trait, and identify J as the ortholog of Arabidopsis thaliana EARLY FLOWERING 3 (ELF3). J depends genetically on the legume-specific flowering repressor E1, and J protein physically associates with the E1 promoter to downregulate its transcription, relieving repression of two important FLOWERING LOCUS T (FT) genes and promoting flowering under short days. Our findings identify an important new component in flowering-time control in soybean and provide new insight into soybean adaptation to tropical regions.
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