Mixed-cropping between field pea varieties alters root bacterial and fungal communities

Horner, A; Browett, SS; Antwis, RE

Abstract

Modern agricultural practices have vastly increased crop production but negatively affected soil health. As such, there is a call to develop sustainable, ecologically-viable approaches to food production. Mixed-cropping of plant varieties can increase yields, although impacts on plant-associated microbial communities are unclear, despite their critical role in plant health and broader ecosystem function. We investigated how mixed-cropping between two field pea (Pisum sativum L.) varieties (Winfreda and Ambassador) influenced root-associated microbial communities and yield. The two varieties supported significantly different fungal and bacterial communities when grown as mono-crops. Mixed-cropping caused changes in microbial communities but with differences between varieties. Root bacterial communities of Winfreda remained stable in response to mixed-cropping, whereas those of Ambassador became more similar to Winfreda. Conversely, root fungal communities of Ambassador remained stable under mixed-cropping, and those of Winfreda shifted towards the composition of Ambassador. Microbial co-occurrence networks of both varieties were stronger and larger under mixed-cropping, which may improve stability and resilience in agricultural soils. Both varieties produced slightly higher yields under mixed-cropping, although overall Ambassador plants produced higher yields than Winfreda plants. Our results suggest that variety diversification may increase yield and promote microbial interactions.

• Journal Article Type: Article
• Acceptance Date: Oct 29, 2019
• Publication Date: Nov 18, 2019
• Deposit Date: Oct 30, 2019
• Publicly Available Date: Nov 21, 2019
• Journal: Scientific Reports
• Print ISSN: 2045-2322
• Publisher: Nature Publishing Group
• Volume: 9
• Issue: 16953
• DOI: https://doi.org/10.1038/s41598-019-53342-8
• Publisher URL: https://doi.org/10.1038/s41598-019-53342-8
• Related Public URLs: https://www.nature.com/srep/