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A nitrogen fixing symbiosis-specific pathway required for legume flowering. 2023
Jinxia Yun, and
Can Wang, and
Fengrong Zhang, and
Li Chen, and
Zhengxi Sun, and
Yupeng Cai, and
Yuanqing Luo, and
Junwen Liao, and
Yongliang Wang, and
Yanyan Cha, and
Xuehai Zhang, and
Ya Ren, and
Jun Wu, and
Paul M Hasegawa, and
Changfu Tian, and
Huanan Su, and
Brett J Ferguson, and
Peter M Gresshoff, and
Wensheng Hou, and
Tianfu Han, and
Xia Li
National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China.
Symbiotic nitrogen fixation boosts legume growth and production in nitrogen-poor soils. It has long been assumed that fixed nitrogen increases reproductive success, but until now, the regulatory mechanism was unknown. Here, we report a symbiotic flowering pathway that couples symbiotic and nutrient signals to the flowering induction pathway in legumes. We show that the symbiotic microRNA-microRNA172c (miR172c) and fixed nitrogen systemically and synergistically convey symbiotic and nutritional cues from roots to leaves to promote soybean (Glycine max) flowering. The combinations of symbiotic miR172c and local miR172c elicited by fixed nitrogen and development in leaves activate florigen-encoding FLOWERING LOCUS T (FT) homologs (GmFT2a/5a) by repressing TARGET OF EAT1-like 4a (GmTOE4a). Thus, FTs trigger reproductive development, which allows legumes to survive and reproduce under low-nitrogen conditions.
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