Skip to Main content Skip to Navigation
Journal articles

Environmental nutrient supply directly alters plant traits but indirectly determines virus growth rate

Abstract : Ecological stoichiometry and resource competition theory both predict that nutrient rates and ratios can alter infectious disease dynamics. Pathogens such as viruses hijack nutrient rich host metabolites to complete multiple steps of their epidemiological cycle. As the synthesis of these molecules requires nitrogen (N) and phosphorus (P), environmental supply rates, and ratios of N and P to hosts can directly limit disease dynamics. Environmental nutrient supplies also may alter virus epidemiology indirectly by changing host phenotype or the dynamics of coinfecting pathogens. We tested whether host nutrient supplies and coinfection control pathogen growth within hosts and transmission to new hosts, either directly or through modifications of plant tissue chemistry (i.e., content and stoichiometric ratios of nutrients), host phenotypic traits, or among-pathogen interactions. We examined two widespread plant viruses (BYDV-PAV and CYDV-RPV) in cultivated oats (Avena sativa) grown along a range of N and of P supply rates. N and P supply rates altered plant tissue chemistry and phenotypic traits; however, environmental nutrient supplies and plant tissue content and ratios of nutrients did not directly alter virus titer. Infection with CYDV-RPV altered plant traits and resulted in thicker plant leaves (i.e., higher leaf mass per area) and there was a positive correlation between CYDV-RPV titer and leaf mass per area. CYDV-RPV titer was reduced by the presence of a competitor, BYDV-PAV, and higher CYDV-RPV titer led to more severe chlorotic symptoms. In our experimental conditions, virus transmission was unaffected by nutrient supply rates, co-infection, plant stoichiometry, or plant traits, although nutrient supply rates have been shown to increase infection and coinfection rates. This work provides a robust test of the role of plant nutrient content and ratios in the dynamics of globally important pathogens and reveals a more complex relationship between within-host virus growth and alterations of plant traits. A deeper understanding of the differential effects of environmental nutrient supplies on virus epidemiology and ecology is particularly relevant given the rapid increase of nutrients flowing into Earth's ecosystems as a result of human activities.
Complete list of metadata

Cited literature [104 references]  Display  Hide  Download
Contributor : Migration Prodinra Connect in order to contact the contributor
Submitted on : Tuesday, May 26, 2020 - 10:07:26 PM
Last modification on : Wednesday, July 7, 2021 - 10:32:02 AM


2017_Lacroix_Frontiers in Micr...
Publisher files allowed on an open archive


Distributed under a Creative Commons Attribution 4.0 International License




Christelle Lacroix, Eric W. Seabloom, Elizabeth T. Borer. Environmental nutrient supply directly alters plant traits but indirectly determines virus growth rate. Frontiers in Microbiology, Frontiers Media, 2017, 8, pp.2116. ⟨10.3389/fmicb.2017.02116⟩. ⟨hal-02628063⟩



Les métriques sont temporairement indisponibles