干尖线虫病对不同水稻品种（系）产量相关性状的影响

目的]该研究旨在了解干尖线虫病对不同水稻品种的影响。方法]通过田间表型观察与室内考种试验，对自然发病状态下的4个常规粳稻品种（系）和粳稻恢复系 R161进行了观察和分析。结果]不同水稻品种（系）被侵染后的症状存在差异，常规粳稻宁1707、宁1818、镇稻88和南粳9108被侵染后表现"干尖"和"小穗头"症状，粳稻恢复系R161只表现"干尖"，不表现"小穗头"症状，且"干尖"的位置不同，分别位于剑叶叶尖，整片剑叶及倒二叶。供试材料被水稻干尖线虫侵染后均能抽穗，但是株高、穗长、结实率和千粒重均受到不同程度的影响。此外，R161被干尖线虫侵染后，不同发病部位对水稻产量的影响不同，整片剑叶干枯扭曲的稻穗受影响最大。结论]该研究为进一步阐明我国水稻干尖线虫病的危害规律和制定相应的防治措施提供依据。

Effects of Aphelenchoides besseyi Infection on Yield Traits of Different Rice Varieties (Lines)

Objective] This study aimed to reveal the effects of Aphelenchoides besseyi infection on different rice varieties (lines). Method] By field observation and indoor phenotypic investigation, four conventional japonica rice varieties (lines) and japonica rice restorer line R161 under natural onset conditions were observed and analyzed. Result] After being infected by A. besseyi, different rice varieties (lines) exhibited various symptoms. Specifical y, Ning 1707, Ning 1818, Zhendao 88 and Nanjing 9108 had withered leaf tips and exhibited the symptoms of "smal grains and erect panicles"; japonica rice restorer line R161 only had withered leaf tips without symptoms of "smal grains and erect panicles", and the withering symptoms occurred in flag leaf tip, whole flag leaf and top second leaf, respectively. After be-ing infected by A. besseyi, al the experimental materials could sprout normal y, but their plant height, panicle length, seed-setting rate and 1 000-grain weight were af-fected to varying degrees. In addition, after being infected by A. besseyi, various symptomatic tissues of R161 exerted different effects on rice yield. Especial y, pani-cles with withered and twisted whole flag leaf were most affected. Conclusion] This study provided the basis for further exploration of the damages of A. besseyi infec-tion to rice and development of corresponding control measures.