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Differential niche response of bouteloua gracilis and pascopyrum smithii to vesicular arbuscular mycorrhizae



Differential niche response of bouteloua gracilis and pascopyrum smithii to vesicular arbuscular mycorrhizae



Bulletin of the Torrey Botanical Club 111(3): 361-365



The seasonality of Glomus fasciculatum associated with B. gracilis and Pascopyrum smithii was contrasted in the field, as well as the effects of this vesicular-arbuscular mycorrhizal (VAM) fungus on physiological parameters of these grasses in the greenhouse. Arbuscule formation was earlier in P. smithii, which has C3 photophysiology, than in the C4 B. gracilis. Soil spore densities were highest in fall samples of both grasses. Both grasses exhibited lower stomatal resistance and increased photosynthesis with VAM formation, but these changes were 36% greater for B. gracilis, B. gracilis has a greater percentage of VAM infection than P. smithii in the field, but percent of the root length infected in the 2 grasses was similar in the greenhouse. The greater niche response of B. gracilis than P. smithii to VAM, coupled with their differing phenologies, may enable coexistence of the 2 grasses.

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Accession: 005156770

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