The relationships among alkaloid concentration, endophyte mycelial concentration and host genetics in the tall fescue Epichloë symbiosis.

The correlation between these phenotypes is numerically small ( r 2 = 0.03) but highly significant ( p = 8.89 × 10 − 9 ), likely due to the large sample size.

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Genome-wide associations find only a single marginally significant hit, however, implying that any genetic control by the host is spread among a large number of genes.

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