科研之友
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摘要
Question Seed-transmitted fungal endophytes of grasses can influence competitive interactions via direct effects of infection on host plant performance or via indirect effects, such as plantsoil feedback effects that operate through changes to soil properties. To date, however, these direct and feedback effects have been evaluated separately. What is the relative importance of endophyte infection vs endophyte-mediated plantsoil feedback effects on competition between seedlings of the grass tall fescue (Schedonorus phoenix) and common species of American Midwestern old-field successional grasslands? Location Long-term field experimental plots at the Indiana University Research and Teaching Preserve and greenhouse of Indiana University (Bloomington, IN, USA). Methods Endophyte-free (E-) and endophyte-infected (E+) tall fescue seedlings were grown individually and in intraspecific competition and pair-wise interspecific competition. Endophyte-mediated plantsoil feedback effects were incorporated by growing seedlings in soil conditioned by either E or E+ tall fescue. Results We found that E and E+ tall fescue experienced stronger intra- and interspecific competition when competing in self-conditioned soils. This pattern was consistent regardless of competitor identity. Conclusions Our findings suggest that the direct benefits of endophyte infection do not drive competitive responses of tall fescue at the early stages of plant development, at least under the conditions examined in our study. Rather, negative plantsoil feedbacks may be more important in moderating plant responses to competitive interactions during seedling establishment of this species. Explicit manipulation of factors such as herbivory and abiotic stress is an important future direction for studies evaluating the relative importance of endophyte infection vs soil-mediated endophyte effects on host plant performance.
- 出版日期2012-8
