Characterization of rhizosphere fungi from selenium hyperaccumulator and nonhyperaccumulator plants along the eastern Rocky Mountain Front Range
| Autor: | Keri L. Bowling, Ami L. Wangeline, J. Rodolfo Valdez, Elizabeth A. H. Pilon-Smits, Stormy Dawn Lindblom, F. Brent Reeves |
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| Rok vydání: | 2011 |
| Předmět: |
Wyoming
Fusarium Colorado Biodiversity Plant Science Selenium Soil Botany Genetics Hyperaccumulator Ecosystem Soil Microbiology Ecology Evolution Behavior and Systematics Rhizosphere Herbivore biology fungi Fungi Stanleya Plants biology.organism_classification Alternaria Adaptation Physiological Host-Pathogen Interactions Soil microbiology |
| Zdroj: | American Journal of Botany. 98:1139-1147 |
| ISSN: | 1537-2197 0002-9122 |
| DOI: | 10.3732/ajb.1000369 |
| Popis: | Premise of study: Selenium-hyperaccumulator plants can store over 1% (dry mass) Se in their tissues, despite the toxicity of this element at high concentrations across eukaryotes. These levels of Se can have widespread effects on the plant ’ s ecological partners, including herbivores and pathogens. Still other partners seem to have coevolved Se tolerance. This is the fi rst known study addressing the rhizosphere mycofl ora of Se hyperaccumulators and aims to evaluate the rhizospheric fungal diversity and Se tolerance to further the knowledge of how these organisms interact with their host plants and survive in these extreme habitats. Methods: Rhizosphere fungi were isolated from Se-hyperaccumulator and nonaccumulator plant species collected from fi ve sites in Colorado and Wyoming; four seleniferous sites and one nonseleniferous site. 259 isolates were identifi ed to genus or species and evaluated for Se tolerance. Key results: Among the 24 represented genera, 11 comprised 86% of the isolates. The majority of isolates from the seleniferous sites were unaffected by 10 mg · L � 1 Se, irrespective of host plant (hyperaccumulator vs. nonaccumulator), while rhizosphere fungi from a control, nonseleniferous site were highly sensitive to Se at 10 mg · L � 1 and as a group were signifi cantly less ( α = 0.05) tolerant than the isolates from the seleniferous sites. Conclusions: Even though Se is a commonly used antifungal agent, these results suggest that rhizosphere fungi from seleniferous habitats have widespread Se tolerance, likely an adaptive advantage in their Se-rich habitat. |
| Databáze: | OpenAIRE |
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