Genetic differentiation within and between natural populations of perennial and annual ryegrass (Lolium perenne and L. rigidum)

Article Abstract:

Starch gel electrophoresis was used to study genetic structure of 120 wild populations of Lolium perenne and 50 of L. rigidum. For both, most diversity seems to be within populations, but significant patterns of geographical variation for diversity indices and allele frequencies exist in L. perenne and the three genetic indices had the same variation trend. Genetic diversity is significantly higher in L. rigidum than in L. perenne. Lolium perenne may come from a small bottleneck of L. rigidum populations of the Middle East.

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High survival frequencies at low herbicide use rates in populations of Lolium rigidum result in rapid evolution of herbicide resistance

Article Abstract:

The detailed dose-response experiments. Large differences in the dose-response characteristics of diclofop-methyl selected and unselected lines of five Lolium rigidum populations confirmed that high initial levels of survival to field recommended rates of diclofop-methyl were the result of heritable variations in herbicide sensitivity.

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The evolutionary ecology of the major histocompatibility complex

Article Abstract:

The contribution of studies on the major histocompatibility complex (MHC) in non-model species is reviewed to understand the effect of ecological and ethological processes on the tempo and mode of evolution at the MHC. It is indicated that positive selection operates on MHC loci to maintain MHC variation.

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