Abstract
We determined concentrations of peramine, the only alkaloid produced by Neotyphodium-infected (E+) Arizona fescue plants (of the four major types typically assayed in infected grasses), in a long-term field experiment. Four plant genotypes with (E+) and without (experimentally removed, E−) their respective haplotypes (two haplotypes in two plant genotypes) of Neotyphodium were grown in the field under manipulated soil moisture and nutrients. Peramine production required the presence of the endophyte; plants without their endophytes did not contain peramine. Whereas the endophyte was necessary for peramine production, levels of peramine did not vary by Neotyphodium haplotype within plant genotypes. Furthermore, peramine levels did not differ among soil moisture and nutrient treatments, and growth and reproductive measures of the host grass explained little of variation in peramine levels. Instead, peramine levels differed significantly between plant genotypes harboring the same endophyte haplotype, suggesting that plant genotype, rather than endophyte haplotype or environment, largely determines levels of peramine in Arizona fescue. The results suggest that whereas the endophyte is required for peramine production, the plant genotypic background in which the endophyte is embedded, rather than endophyte haplotype or environmental factors, mostly influences peramine levels within this population of Arizona fescue.
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Faeth, S.H., Bush, L.P. & Sullivan, T.J. Peramine Alkaloid Variation in Neotyphodium-Infected Arizona Fescue: Effects of Endophyte and Host Genotype and Environment. J Chem Ecol 28, 1511–1526 (2002). https://doi.org/10.1023/A:1019916227153
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DOI: https://doi.org/10.1023/A:1019916227153