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Do the costs and benefits of fungal endophyte symbiosis vary with light availability?

Authors
  • Davitt, Andrew J
  • Stansberry, Marcus
  • Rudgers, Jennifer A
Type
Published Article
Journal
New Phytologist
Publisher
Wiley (Blackwell Publishing)
Publication Date
Nov 01, 2010
Volume
188
Issue
3
Pages
824–834
Identifiers
DOI: 10.1111/j.1469-8137.2010.03428.x
PMID: 20955417
Source
Medline
License
Unknown

Abstract

• Here, we examined whether fungal endophytes modulated host plant responses to light availability. First, we conducted a literature review to evaluate whether natural frequencies of endophyte symbiosis in grasses from shaded habitats were higher than frequencies in grasses occupying more diverse light environments. Then, in a glasshouse experiment, we assessed how four levels of light and the presence of endophyte symbioses affected the growth of six grass species. • In our literature survey, endophytes were more commonly present in grasses restricted to shaded habitats than in grasses from diverse light environments. • In the glasshouse, endophyte symbioses did not mediate plant growth in response to light availability. However, in the host grass, Agrostis perennans, symbiotic plants produced 53% more inflorescences than nonsymbiotic plants at the highest level of shade. In addition, under high shade, symbiotic Poa autumnalis invested more in specific leaf area than symbiont-free plants. Finally, shade increased the density of the endophyte in leaf tissues across all six grass species. • Our results highlight the potential for symbiosis to alter the plasticity of host physiological traits, demonstrate a novel benefit of endophyte symbiosis under shade stress for one host species, and show a positive association between shade-restricted grass species and fungal endophytes.

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