Soybean reduced internode 1 determines internode length and improves grain yield at dense planting

Shichen Li, Zhihui Sun, Qing Sang, Chao Qin, Lingping Kong, Xin Huang, Huan Liu, Tong Su, Haiyang Li, Milan He, Chao Fang, Lingshuang Wang, Shuangrong Liu, Bin Liu (), Baohui Liu (), Xiangdong Fu (), Fanjiang Kong () and Sijia Lu ()
Additional contact information
Shichen Li: Guangzhou University
Zhihui Sun: Guangzhou University
Qing Sang: Guangzhou University
Chao Qin: The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI), Institute of Crop Science, Chinese Academy of Agricultural Sciences
Lingping Kong: Guangzhou University
Xin Huang: Guangzhou University
Huan Liu: Guangzhou University
Tong Su: Guangzhou University
Haiyang Li: Guangzhou University
Milan He: Guangzhou University
Chao Fang: Guangzhou University
Lingshuang Wang: Guangzhou University
Shuangrong Liu: Guangzhou University
Bin Liu: The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI), Institute of Crop Science, Chinese Academy of Agricultural Sciences
Baohui Liu: Guangzhou University
Xiangdong Fu: State Key Laboratory of Plant Cell and Chromosome Engineering, Institute of Genetics and Developmental Biology, Innovation Academy for Seed Design, Chinese Academy of Sciences
Fanjiang Kong: Guangzhou University
Sijia Lu: Guangzhou University

Nature Communications, 2023, vol. 14, issue 1, 1-13

Abstract: Abstract Major cereal crops have benefitted from Green Revolution traits such as shorter and more compact plants that permit high-density planting, but soybean has remained relatively overlooked. To balance ideal soybean yield with plant height under dense planting, shortening of internodes without reducing the number of nodes and pods is desired. Here, we characterized a short-internode soybean mutant, reduced internode 1 (rin1). Partial loss of SUPPRESSOR OF PHYA 105 3a (SPA3a) underlies rin1. RIN1 physically interacts with two homologs of ELONGATED HYPOCOTYL 5 (HY5), STF1 and STF2, to promote their degradation. RIN1 regulates gibberellin metabolism to control internode development through a STF1/STF2–GA2ox7 regulatory module. In field trials, rin1 significantly enhances grain yield under high-density planting conditions comparing to its wild type of elite cultivar. rin1 mutants therefore could serve as valuable resources for improving grain yield under high-density cultivation and in soybean–maize intercropping systems.

Date: 2023
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DOI: 10.1038/s41467-023-42991-z

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