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Genetically optimizing soybean nodulation improves yield and protein content.

Xiangbin Zhong1, Jie Wang1, Xiaolei Shi2

  • 1College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, China.

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Gene editing soybean (Glycine max (L.)) for optimal nodulation, specifically the ric1a/2a mutant, enhances carbon and nitrogen acquisition. This leads to improved grain yield, protein, and oil content in field trials.

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Area of Science:

  • Agricultural Science
  • Plant Biology
  • Genetics

Background:

  • Symbiotic nitrogen fixation in legumes, like soybean, demands significant host plant energy.
  • Soybean supernodulation mutants often exhibit stunting and yield loss due to excessive carbon consumption.

Purpose of the Study:

  • To investigate the effects of gene editing on soybean nodulation and its impact on plant growth, yield, and quality.
  • To identify soybean mutants with balanced carbon allocation and enhanced nutrient acquisition.

Main Methods:

  • Development and analysis of soybean mutants with varying nodulation abilities.
  • Field trials across multiple years and locations in China to assess yield and quality traits.
  • Evaluation of carbon allocation and nutrient acquisition in selected mutants.

Main Results:

  • The rhizobially induced cle1a/2a (ric1a/2a) mutant showed a moderate increase in nodule number.
  • ric1a/2a lines demonstrated balanced carbon allocation and improved carbon and nitrogen acquisition.
  • Multi-year, multi-site field trials confirmed improved grain yield, protein content, and sustained oil content in two ric1a/2a lines.

Conclusions:

  • Gene editing to achieve optimal nodulation in soybean can overcome the negative impacts of supernodulation.
  • Targeting nodulation pathways offers a promising strategy for enhancing soybean yield and nutritional quality.