No evidence of foliar disease impact on crop root functional strategies and soil microbial communities: what does this mean for organic coffee?

Gagliardi Stephanie, Avelino Jacques, Fulthorpe Roberta, de Melo Virginio Filho Elias, Isaac Marney E.. 2023. No evidence of foliar disease impact on crop root functional strategies and soil microbial communities: what does this mean for organic coffee?. Oikos, 2023 (1):e08987, 12 p.

https://doi.org/10.1111/oik.08987

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Url - jeu de données - Entrepôt autre : https://orcid.org/0000-0003-1612-0173

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Global climate change is increasing pest and pathogen pressures on plant communities, deteriorating optimal plant functioning. In plant communities, root functional trait expression and microbial communities are important indicators of plant functioning belowground, and, when confronted with pathogens aboveground, can simultaneously reflect plant defence strategies. Yet, while research is continuing to emerge on the response of root functional traits and microbial processes to pathogens aboveground, little work has investigated these interactions in tree-crops, or the role organic amendments play in moderating these relationships. The main objective of this study is to disentangle the dynamic effects of pathogens and amendments on root functional traits (i.e. specific root length and area, root diameter, root length density, root nitrogen and root carbon to nitrogen ratio) and root endophytic fungal communities. As a model, we use Coffea arabica (coffee) variety Caturra along a gradient of coffee leaf rust – a foliar disease prominent in coffee systems – under contrasting but widespread amendment regimes in biodiverse agroforestry systems. We found that root trait expression varies along established conservation and collaboration gradients, where fungal endophyte community composition varies significantly as a function of root traits. Belowground resource acquisition strategies do not change with foliar disease incidence, suggesting they may be decoupled. Rather, amendment regimes differentially shape root trait expression and microbial communities, where coffee plants under organic amendments, regardless of foliar disease incidence, expressed greater acquisitive traits and enhanced collaboration with symbiotic fungi. This is an important first step in disentangling the dynamic inter-relationships between plant traits, endophytes and pathogens, generating new questions on the role of amendments in sustainable pathogen management in biodiverse agroecosystems.

Mots-clés Agrovoc : Hemileia vastatrix, système racinaire, micro-organisme du sol, maladie foliaire, Coffea arabica, systèmes agroforestiers, agroforesterie, endophyte, agent pathogène

Mots-clés géographiques Agrovoc : Costa Rica

Mots-clés complémentaires : rouille du caféier, rouille orangée

Mots-clés libres : Agroforestry, Coffee, Coffee arabica, Coffee leaf rust, Hemileia vastatrix, Fungal root endophytes, Root functional traits

Classification Agris : H20 - Maladies des plantes
F60 - Physiologie et biochimie végétale
P34 - Biologie du sol

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

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