Abstract:

Biological characteristics of Mt^r mutants and parental Mt^s isolates of P. boehmeriae were studied, the results showed that resistance levels of Mtr mutants to metalaxyl were greatly increased than those of the parental isolates. There was no difference in the adaptation scope of temperature. The growth rates of Mtr isolates were obviously lower than those of the parental Mts wild isolates at the same temperature. The oospore production of Mtr isolates was obviously less than those of the parental Mts isolates. The results suggested that the adaptability of Mtr isolates to temperature was reduced and so did the sexual reproduction of Mtr isolates while they produced metalaxyl - resistance.[著者文摘]