Implications of plant-fungal interactions: can microscale processes have macroscale impacts?

TitleImplications of plant-fungal interactions: can microscale processes have macroscale impacts?
Publication TypeConference Paper
Year of Publication2004
AuthorsLucero M., Barrow J.R.
Conference NameSixth Symposium on the Natural Resources of the Chihuahuan Desert Region
Date PublishedOctober 25, 2004
Conference LocationAlpine, TX
ARIS Log Number171306
Keywordsblack grama, desert plant communities, fourwing saltbush, macroscale impacts, microscale processes, plant-fungal interactions
AbstractThe roles microorganisms play in shaping desert plant communities have often been underestimated. Recent tools expanding our abilities to detect, identify, and monitor microbial inhabitants of plant tissues are providing new insights to amazingly complex systems. Microscale examination of Boutelouaeriopoda (black grama grass) and Atriplexcanescens (fourwing saltbush) has revealed diverse fungal communities living within individual plants. The compositions of these fungal communities are apparently dictated by multiple factors. We believe these internal fungi assist the plant with water and nutrient transport, drought tolerance, and defense against herbivores and pathogens. To explore thresholds of plant fitness that are defined by microbial communities, we transferred fungi inhabiting Boutelouaeriopoda, Atriplex canescens, and Sporobolus cryptandrus to eight, nonhost plant species. Dramatic, whole-plant differences in morphology, water potential, chlorophyll content, dates to maturity, seed production and marker gene profiles, and more between treated and untreated plants, were observed. In most cases, endophyte transfer at the cellular level produced astonishingly robust plants with greater reproductive potential than the untransformed counterparts. The dramatic changes observed in plants with altered microbial populations illustrate the propagation of cellular-level changes to whole-plant and progeny-scale impacts. We hypothesize that these transformed plants will continue to grow, reproduce, and disperse more rapidly than their native counterparts, propagating changes from the plant-microbe interface to ecologically significant scales. Broad-scale factors limiting this process are being explored.