Journal
CURRENT BIOLOGY
Volume 31, Issue 17, Pages 3755-+Publisher
CELL PRESS
DOI: 10.1016/j.cub.2021.06.037
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Funding
- National Natural Science Foundation of China [31930083, 31725021, 32090064, 31801390]
- Major Program of Guangdong Basic and Applied Research [2019B030302006]
- China Postdoctoral Science Foundation [2018 M633177]
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The study identified florigen gene variants FT2a and FT5a in soybeans, which delay flowering time under short-day conditions and increase yield. Additionally, it was found that FT2a and FT5a variants have diverse origins and played distinct roles as soybean spread to lower latitudes.
The classical soybean (Glycine max) trait long juvenile (LJ) is essentially a reduction in sensitivity to short-day (SD) conditions for induction and completion of flowering, and has been introduced into soybean cultivars to improve yield in tropical environments. However, only one locus, J, is known to confer LJ in low-latitude varieties. Here, we defined two quantitative trait loci contributing to the LJ trait, LJ16.1 and LJ16.2, and identified them as the florigen (FT) homologs FT2a and FT5a, respectively. The two selected florigen variations both delay flowering time under SD conditions by repressing the floral meristem identity gene GmAPETALA1. Single mutants have a relatively subtle effect on flowering time and displayed a substantial genetic compensation response, but this was absent in ft2a ft5a double mutants, which showed an enhanced LJ phenotype that translated to higher yields under SD conditions. A survey of sequence diversity suggests that FT2a and FT5a variants have diverse origins and have played distinct roles as soybean spread to lower latitudes. Our results show that integration of variants in the florigen genes offers a strategy for customizing flowering time to adjust adaptation and improve crop productivity in tropical regions.
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