摘要： 利用室内人工接种方法对腐烂茎线虫杂交后代进行致病力、繁殖力的测定,结果表明:同一基因型内各组合中均能杂交成功,比较发现各种群的后代数目与对照亲本的数目有显著差异,各杂交组合中杂交率与F₁数量均低于对照组(对照组为亲本自交);各杂交群体在致病力、繁殖力表现方面与对照DeSD种群在P0.05水平上均存在差异;各种群正反交群体致病力、繁殖力与对照相比,对照DeSD种群所在的反交组合表现特征均高于其正交组合;相关性分析,腐烂茎线虫两类基因型各种群基因型内杂交群体致病力与繁殖力均存在正相关。本研究对模拟我国不同地理来源腐烂茎线虫种群扩散后所产生杂交代的致病力分化情况,腐烂茎线虫遗传多样性具有重要的应用价值,并为不同地理来源有害生物入侵分险评估提供理论依据。

关键词: 生物学杂交, 腐烂茎线虫, 致病力, 繁殖力

Abstract: Using artificial inoculation methods，on offspring of Ditylenchus destructor， the pathogenicity， fecundity of that were determination， the results showed that: hybrids combinations within the same genotype can successfully． Compared of the number of descendants， found in the various groups and control parents were significantly different， the hybridization rate and the number of F₁hybrid were lower than the control group(the control group as the parents selfed) ; The hybrid groups and control DeSD population， in pathogenicity， reproductive performance， there were differences at the P0． 05 level; Compared with groups of reciprocal groups and the control population in the pathogenicity， fecundity，performance characteristics of the anti-crosses was higher than the orthogonal on the control DeSD; Correlation analysis was showed that pathogenicity and fecundity of Ditylenchus destructorhybridization groups were positively correlated． This study has important applications on the genetic diversity of Ditylenchus destructorand the virulence differentiation of simulating proliferation of hybrids of Ditylenchus destructorpopulations in different geographical origin，at the same time，This was provided a theoretical basis on the risk assessment of pest invasion from different geographical origin．

Key words: Biological hybrid, Ditylenchus destructor, Pathogenicity, Fecundity

中图分类号: 

• S435