The pathogenicity difference of *** on cabbage were carried out under 7 different temperature and 6 different soil pH with the soil with the resting spore concentration of 1 × 10～8 spores/g in the *** disease co...
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The pathogenicity difference of *** on cabbage were carried out under 7 different temperature and 6 different soil pH with the soil with the resting spore concentration of 1 × 10～8 spores/g in the *** disease condition was investigated after 90 *** results showed that there here different infection rates of clubroot of cabbage among different temperature sets,the effect of temperature on the incidence of clubroot in descending order as follows;30℃ >25℃ > 20℃ >35℃ > 15℃ > 10℃ >5℃under pH 6,the infection of clubroot was weak and the infection rate was low under the temperature value of 5℃ and 10℃.The disease rate increased with increasing soil temperature under the temperature value of 5 0℃,but decreased at 35℃,the infection rates of clubroot were 80.36%,100%,65%,10.77%,3.23%,0%under the soil pH 4,5,6,7,8 and 9 at 25℃,respectively,the growth of cabbage was inhibited and the survival rate was reduced under pH 4,the infection rates of clubroot were low under pH 7 and 8,and the infection rate of *** was 0%under pH *** Chinese cabbage grew better under pH of 5 and 6,but had the high infection rates of *** infection rate of clubroot was related to the temperature and soil pH closely.
水稻瘤矮病由水稻瘤矮病毒(rice gall dwarf virus,RGDV)引起,是一种重要的水稻病毒病害,主要分布于东南亚、中国和韩国。在中国,电光叶蝉(Reciliadorsalis)是RGDV最主要的传播介体。为了明确昆虫携带病毒后对昆虫行为的影响,本研究通...
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水稻瘤矮病由水稻瘤矮病毒(rice gall dwarf virus,RGDV)引起,是一种重要的水稻病毒病害,主要分布于东南亚、中国和韩国。在中国,电光叶蝉(Reciliadorsalis)是RGDV最主要的传播介体。为了明确昆虫携带病毒后对昆虫行为的影响,本研究通过组建昆虫生命表和Y型嗅觉仪评估RGDV对介体昆虫电光叶蝉直接和间接的影响。结果表明,带毒群体与对照群体相比,RGDV对电光叶蝉生命表参数有显著的影响,包括延缓若虫发育历期平均1.73天,若虫死亡率升高30.76%,成虫寿命缩短12.77天,成虫产卵量降低42.91%,卵的孵化率降低2.36%,以及成虫交配率提高6.14%;健康电光叶蝉偏好取食发病植株,而带毒电光叶蝉则无明显的取食偏好性;产卵选择性实验也表明健康电光叶蝉偏好产卵于带毒植株,而带毒电光叶蝉则无明显的偏好性。由此我们认为RGDV侵染改变了介体电光叶蝉种群的适合度,RGDV侵染不利于介体电光叶蝉种群的繁衍,但有利于病毒的传播和扩散。
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