A nitrogen fixing symbiosis-specific pathway required for legume flowering

Author:

Yun Jinxia1ORCID,Wang Can1ORCID,Zhang Fengrong1ORCID,Chen Li23ORCID,Sun Zhengxi1ORCID,Cai Yupeng23ORCID,Luo Yuanqing1ORCID,Liao Junwen1ORCID,Wang Yongliang1ORCID,Cha Yanyan1ORCID,Zhang Xuehai1ORCID,Ren Ya1ORCID,Wu Jun1,Hasegawa Paul M.4,Tian Changfu5ORCID,Su Huanan6ORCID,Ferguson Brett J.6,Gresshoff Peter M.6,Hou Wensheng23ORCID,Han Tianfu3ORCID,Li Xia17ORCID

Affiliation:

1. National Key Laboratory of Crop Genetic Improvement, Hubei Hongshan Laboratory, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan, China.

2. National Center for Transgenic Research in Plants, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.

3. Ministry of Agriculture Key Laboratory of Soybean Biology (Beijing), Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.

4. Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN 47907, USA.

5. State Key Laboratory of Agrobiotechnology, Key Laboratory of Soil Microbiology, and Rhizobium Research Center, and College of Biological Sciences, China Agricultural University, Beijing, China.

6. School of Agriculture and Food Sciences, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia.

7. Guangdong Laboratory for Lingnan Modern Agriculture, Guangdong, China.

Abstract

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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference62 articles.

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