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Related Experiment Video

Updated: Sep 11, 2025

Repeatable Stair-step Assay to Access the Allelopathic Potential of Weedy Rice Oryza sativa ssp.
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Neighbor Relatedness Contributes to Improvement in Grain Yields in Rice Cultivar Mixtures.

You Xu1,2, Qin-Hang Han1, Shuai-Shuai Xie1

  • 1College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.

Plants (Basel, Switzerland)
|August 14, 2025
PubMed
Summary

Planting closely related rice cultivars together boosts grain yield by optimizing plant growth and accelerating flowering. This kinship strategy enhances crop production and soil microbial diversity.

Keywords:
effect of relatednessflowering timekin recognitionneighboring cultivar identitynitrogen use levelrhizosphere microbial community

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Area of Science:

  • Agricultural Science
  • Plant Biology
  • Ecology

Background:

  • Cultivar mixtures often show improved yields compared to monocultures.
  • Benefits of within-species diversification and resource use efficiency are known.
  • The role of neighbor relatedness in intraspecific interactions within cultivar mixtures is poorly understood.

Purpose of the Study:

  • To investigate if neighbor relatedness influences grain yields in rice cultivar mixtures.
  • To experimentally test the impact of genetic relatedness on rice yield.
  • To explore the underlying mechanisms and environmental dependencies of relatedness-mediated yield improvements.

Main Methods:

  • Experimental cultivation of rice cultivar mixtures across a relatedness gradient.
  • Assessment of grain yield under field and controlled conditions.
  • Analysis of root-to-shoot ratio, flowering time, and rhizosphere microbial communities (bacteria and fungi).

Main Results:

  • Closely related cultivar mixtures exhibited higher grain yields than monocultures and distantly related mixtures.
  • Yield improvements were linked to optimized root-to-shoot ratios and accelerated flowering.
  • Relatedness effects were dependent on soil volume and nitrogen availability, diminishing under larger volumes or nitrogen deficiency.
  • Neighbor relatedness increased rhizosphere bacterial and fungal richness and diversity, altering microbial community structure.

Conclusions:

  • Neighbor relatedness can significantly enhance rice grain yield in cultivar mixtures.
  • Manipulating cultivar kinship offers a strategy for improving plant-plant interactions and crop production.
  • Understanding kinship strategies is crucial for sustainable agricultural intensification.