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Influence of Neotyphodium lolii and barley yellow dwarf virus, individually and combined, on the growth of Lolium perenne

The effect of infection by either of two strains of the endophyte Neotyphodium lolii with or without infection by barley yellow dwarf virus (BYDV) on the growth of eight perennial ryegrass genotypes was investigated in a greenhouse trial. Herbage production was significantly influenced by plant genotype. Infection with BYDV reduced dry matter and tiller production of most perennial ryegrass plants and although there was no significant plant genotype x virus interaction, the genotypes differed in their response to virus infection. Infection with endophyte induced an increase in plant dry weight of 42% in one genotype, whereas the others were not significantly affected. Presence of BYDV did not influence production of the alkaloids ergovaline, lolitrem B or peramine, nor was there a significant interaction between the two strains of endophyte and the virus. However, with some genotypes virus infection masked the effect of endophyte on the dry matter production of plants.