Exploring endophyte compatibility in perennial ryegrass
DOI:
https://doi.org/10.33584/rps.13.2006.3105Abstract
The association between perennial ryegrass (PRG) and fungal endophyte is an important factor in the protection of New Zealand pastures from insect pests, and the genetic background of the host plant significantly affects endophyte performance. Quantitative trait locus (QTL) analysis of phenotypic data from herbage harvested from a mapping population in autumn 2005 identified loci in the PRG genome influencing three traits: (1) endophyte mycelial mass; (2) ergovaline level; (3) peramine level. Three QTL were identified for each trait. For mycelial mass two QTL accounted for more than 75% of the variation (PV) for in the population and have considerable potential for development as pre-inoculation marker-assisted selection (MAS) tools for endophyte colonisation in PRG breeding programmes. The largest-effect QTL for peramine level (18% PV) coincided with a major mycelial mass QTL, implying peramine concentration is partly determined by endophyte colonisation. All other alkaloid QTL, however, were independent of mycelial mass, indicating it may be possible to develop MAS that will facilitate breeding for alkaloid phenotype, independent of the degree of endophyte colonisation. Keywords: DIMS, ELISA, Lolium, map, metabolic profiling, Neotyphodium, SSR
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