腐烂茎线虫不同群体致病性差异分析

Analysis of Pathogenicity Differences in Different Ditylenchus destructor Populations

为明确不同来源腐烂茎线虫致病性差异,采用盆栽试验,对分离自马铃薯(DXP2、HLJP1和SXP1)、党参(TCC1)和当归(WYA3和HZA3)的6个群体进行致病性测定。每个群体分别接种马铃薯、甘薯和党参(500条/盆,3个重复),60d后统计病情级别和繁殖系数。结果表明,6个群体均可侵染马铃薯,4个群体可侵染甘薯,所有群体均未侵染党参。不同群体的致病性存在明显差异,马铃薯线虫群体对甘薯和马铃薯具有较强致病性,党参线虫群体可侵染马铃薯和甘薯,但病情级别和繁殖系数较低。当归线虫群体只侵染马铃薯,且致病性和繁殖系数极低。

In order to clarify pathogenicity difference of different Ditylenchus destructor populations,a pathogenicity experiment on six populations of Ditylenchus destructor,including DXP2,HLJP1 and SXP1 from potatoes,TCC1 from Radix Codonopsis,WYA3 and HZA3 from angelica,were conducted by pot experiment.Potato,sweet potato and Radix Codonopsis were inoculated with each nematode population(500 nematodes/pot,three replications),and disease grades and reproduction coefficients were calculated after 60 d.The results showed that potato was infected with all of six populations,the sweet potato was infected with four populations and Radix Codonopsis was not infected with any population.And the pathogenicities were distinctly different.Nematode populations from potato showed higher pathogenicity in sweet potato and potato.The population from Radix Codonopsis could infect both potato and sweet potato with low disease grades and reproduction coefficients.So the populations from angelica can only infect potato with a very low disease grade and reproduction coefficient.