| molecular data do not support a southern hemisphere base of nothofagus powdery mildews. | three powdery mildew species present on nothofagus (viz. erysiphe magellanica, e. nothofagi and e. patagoniaca) are endemic to south america and have unique ascomatal appendages that are not found in powdery mildews of the northern hemisphere. we determined the nucleotide sequences of the rdna internal transcribed spacer regions and d1/d2 domains of the 28s rdna of these three powdery mildew species to reveal their phylogenetic relationships with powdery mildews of the northern hemisphere. altho ... | 2008 | 18959156 |