G. Cavan et al., Herbicide resistance and gene flow in wild-oats (Avena fatua and Avena sterilis ssp. ludoviciana), ANN AP BIOL, 133(2), 1998, pp. 207-217
The process of resistance evolution to fenoxaprop-P-ethyl was investigated
in the cereal weeds wild-oats (Avena fatua L. and Avena sterilis ssp. ludov
iciana Malzew) at a number of locations in England, including one farm wher
e distinct patches occur within fields. Genetic fingerprints produced using
PCR-based techniques provided evidence for hybridisation between the speci
es and that resistance had spread from one patch to others. The proportion
of total variation due to differences between populations (G(st)) was estim
ated at 33-42%, and herbicide-resistant patches contained on average less g
enetic diversity than herbicide-sensitive counterparts: both findings were
consistent with a high degree of self-pollination. It was however concluded
that cross-pollination occurs both within and possibly between species, an
d that this can result in the spread of herbicide resistance.