Above- and belowground plant pathogens along elevational gradients:
patterns and potential mechanisms
Abstract
Plant pathogens are important for ecosystem functioning and community
assembly and respond to a variety of biotic and abiotic factors, which
change along elevation gradients. Thus elevational gradients are a
valuable model system for exploring how plant community, soil
properties, and environmental factors influence pathogens. Yet, how
these factors influence pathogens in nature remains poorly understood.
We tested patterns and potential mechanisms of plant fungal pathogens
along elevational gradients by combining a field survey in the Tibetan
Plateau with a global meta-analysis. We found that increasing elevation
was associated with a decrease in soil fungal pathogen richness but not
foliar fungal disease symptoms. Elevation mainly related to soil fungal
pathogen richness through abiotic factors. Whereas no evidence supported
association between elevation and foliar fungal disease. The
meta-analysis suggests some generality in the results of the field
survey: elevation was associated with a decrease in soil fungal pathogen
richness, but had no consistent relationship with foliar fungal disease
or pathogens. Our study reveals distinct patterns of above- and
belowground plant pathogen along elevation gradients and provides new
insight into the potential mechanisms in shaping these patterns.