Accumulation of ergopeptide alkaloids in symbiotic tall fescue grown under deficits of soil water and nitrogen fertilizer

Article Abstract:

The effects of flooding and nitrogen fertilization on ergot alkaloid production within the tall fescue-Acremonium coenophialum symbiotic interactionwere determined. The results suggest that flooding does not appreciably affect ergot alkaloid biosynthesis by the fungus. However, under moderate water deficit ergot synthesis is significantly affected by the type and rate of nitrogen available. Under drought conditions, nitrogen availability does not affect ergot biosynthesis because of decreased permeability of roots to nitrogen.

Physiological aspects, Growth, Endosymbiosis, Ergot, Nitrogen fertilizers, Tall fescue

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Competitive interactions among symbiotic fungi of the southern pine beetle

Article Abstract:

Three symbiotic fungi; Ceratocystiopsis ranaculosus, Entomocorticium sp. A and Ophiostoma minus; of the southern pine beetle are involved in competitive interactions. O. minus is the most capable of capturing both uncolonized and colonized resources. Entomocorticium sp. A and C. ranaculosus are almost equal competitors, but differ in their abilities to compete with O. minus. The competitive interactions may have a distinct influence on the biology of the beetle, that is ecologically and economically important.

Southern pine beetle

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Temperature affects species distribution in symbiotic populations of Vibrio spp

Article Abstract:

Different Vibrio species occur as symbionts in the squid Sepiola, depending on the temperature of the water. Vibrio logei grows faster at 18 deg C. whereas Vibrio fischeri grows faster at 26 deg C.

Environmental aspects, Microbial ecology, Vibrio

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