Chemically and Microbially Mediated Kinship Strategies in Rice Cultivar Mixtures.

Area of Science:

• Agricultural Science
• Plant Biology
• Ecology

Background:

• Intraspecific interactions and neighbour relatedness can improve crop yields.
• Limited understanding exists regarding chemical and microbial mediation of kinship responses in cultivar mixtures.

Purpose of the Study:

• To investigate how genetic relatedness between rice cultivars influences yield.
• To elucidate the roles of root signaling chemicals and soil microbes in mediating kinship effects.

Main Methods:

• Conducted field and controlled experiments using rice cultivars of varying genetic relatedness.
• Analyzed root behavior, biomass allocation, flowering time, root signaling chemicals (specifically (-)-loliolide), and soil microbial communities.

Main Results:

• Rice cultivars discriminated between closely and distantly related neighbours, altering their growth and development.
• Increased grain yield in mixtures was linked to relatedness, mediated by (-)-loliolide and soil microbes.
• (-)-loliolide directly influenced soil microbes associated with flowering time and seed biomass.

Conclusions:

• Neighbor relatedness shapes soil microbial communities, leading to kinship effects that enhance rice yield.
• The root signal (-)-loliolide and associated soil microbes play a crucial role in yield improvement in related rice cultivar mixtures.
• Manipulating kinship in cultivar mixtures offers a potential strategy for increasing crop production.