Examining the Relationship between Rotational Value and the Soil Microbiome of the USDA Pea (Pisum sp.) Mini-Core

Le résumé fourni par la source

Peas (Pisum sp.) are widely used in crop rotations because they increase soil fertility through nitrogen fixation. Previous work indicates that pea genotypes differ in the benefit they provide to subsequently planted corn, with wild accessions displaying greater rotational value due to the recruitment of beneficial soil microbes. We further investigate the source of variation in rotational value, focusing on changes in the soil microbiome and soil chemical properties across 108 genotypes from the USDA Pea Single Plant Plus Mini-Core. Four replicates of each pea genotype were grown in a greenhouse for four weeks, when they were uprooted to determine soil microbial communities and soil chemical properties. Corn was then grown to maturity in the same pots with the same soil to measure the yield of subsequently planted corn, and ultimately the rotational value of each genotype. A genome-wide association study (GWAS) was performed to determine the genetic basis of rotational value. While no variation was observed in rotational value, we identified genotypes that enrich a potential plant growth promoting bacteria in the genus Pseudarthrobacter. The enrichment of this genus was associated with a single SNP. Crops are rarely bred with their impact on the subsequently planted crop in mind, despite this being an important pre-requisite for increasing adoption of cover cropping and crop rotation. We have identified pea accessions and traits contained within the USDA Pea Single Plant Plus Mini-Core that may be useful in future breeding endeavors focused on increasing crop rotational value.

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