Leaf-associated microbiomes of grafted tomato plants

Area of Science:

• Plant Science
• Microbiology
• Genetics

Background:

• Plant microbiomes, comprising bacteria and fungi, are crucial for plant health and growth.
• Host plant genotypes are known to influence these associated microbial communities.
• The impact of rootstock genotypes on the leaf microbiome of grafted plants remains largely unexplored.

Purpose of the Study:

• To investigate the influence of rootstock genotypes on the leaf endophytic microbiome structure in grafted tomato plants.
• To determine the extent to which rootstock genetics shape microbial community assembly in the leaves.

Main Methods:

• Grafted tomato plants (eight varieties) were grown under field conditions.
• Illumina sequencing was employed to analyze bacterial and fungal communities in leaf tissues.
• Statistical analyses were performed to assess the impact of rootstock genotype and sampling location on microbiome composition.

Main Results:

• Overall bacterial and fungal community structures in leaves did not significantly differ based on rootstock genotype.
• Sampling location within the farmland was a major driver of microbiome variation.
• Specific microbial taxa, including the bacterium Deinococcus and the yeast Hannaella, exhibited preferential associations with particular rootstock treatments or ungrafted plants.

Conclusions:

• Rootstock genotype has a limited effect on the overall leaf microbiome structure in grafted tomato plants.
• While overall community structure is not strongly influenced, specific microbial taxa may be selectively associated with rootstock genotypes.
• Findings highlight the complex interplay between plant genetics, environment, and microbiome assembly in agricultural systems.