土壤理化因素对香蕉枯萎病菌生长和侵染的影响
Effects of soil physi-chemical factors on growth and infection of banana fusarium wilt pathogen Fusarium oxysporum f. sp. cubense

为探明土壤理化因素对香蕉枯萎病菌的影响，在实验室条件下，以尖镰孢古巴专化型4号生理小种（Fusarium oxysporum f. sp. cubense race 4,Foc 4）菌株为对象，模拟不同的土壤类型、温度、含水量和pH值等条件，观察和分析这些因子对Foc 4生长和侵染的影响。结果表明，Foc 4在土壤中生长的最适条件为：土壤温度25℃，含水量达到30%和偏酸性条件（pH 4~5）；在盆栽试验中，Foc 4的最佳侵染条件为：温度30℃，偏酸性（pH 3~5）的土壤环境。
In order to verify the effects of soil physi-chemical factors on the banana fusarium wilt pathogen (Fusarium oxysporum f. sp. cubense race 4,Foc 4),various soil physi-chemical factors including soil types,temperature,water content and pH value were simulated under laboratory conditions,and the effects on the growth and infection of Foc 4 were observed and analyzed.The results showed that the optimal growth conditions for Foc 4 were at 25℃ with higher soil moisture of 30% and acidic pH value of 4 to 5 in soil; whereas the optimal infection conditions of Foc 4 to banana plantlets were at 30℃ and in the acidic soil environment (pH 3 to 5) in the pot experiments.