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The seasonality of Glomus fasciculatum associated with Bouteloua 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 C1 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 % of the root length infected in the two grasses was...
Arbuscular mycorrhizal fungi (AMF) are known to reduce the growth of generalist root-feeding insects, but whether the same is true for a specialist insect is unknown. White clover (Trifolium repens) was inoculated with the AM fungi Glomus fasciculatum and Glomus mosseae individually and in combination, and larvae of the clover root weevil (Sitona lepidus) reared on mycorrhizal and non-mycorrhizal plants. On emergence, adult weevils were weighed and the percentage of larvae surviving to adulthood was calculated for each treatment. Larval survival to adulthood was increased by both species of fungi, but weight was unaffected. Larval feeding reduced foliar biomass, but had no effect when two fungi colonized the root...