不同时期嫁接感染甘薯病毒病（SPVD）对甘薯产量的影响

摘要

In order to investigate the effects of sweet potato virus disease (SPVD)at different inoculation date on the yield and establish yield loss evaluation model,two cultivars (‘Zhengshu 20’and ‘Xushu 25’)were grafted with diseased scion at four growth stages.The results showed that the decline in disease index of sweet potato and the increase in chloro-phyll content were correlated with the delay of grafting periods.Fresh weight and dry weight per plant were also increasing with the delay of plant grafting periods.According to the experimental results of 2012,the yield loss rate equation was con-structed:Y=0.727 6X+23.279,R 2 =0.8845,and the yield loss model was validated with the experimental data of 2013.%为了研究甘薯不同生育时期感染甘薯病毒病（SPVD）对甘薯产量的影响，并建立产量损失估计模型，以‘郑薯20’和‘徐薯25’两个甘薯品种为试验材料，分4个时间嫁接感染 SPVD。试验结果表明，感染 SPVD 的甘薯病情指数随着嫁接时间推迟而降低，叶绿素含量随嫁接时间推迟而逐渐提高，单株鲜重和干重随着嫁接时间的推迟逐渐增加。根据2012年试验结果，建立了病情指数（X）与产量损失率（Y）之间的关系模型：Y ＝0．7276X ＋23．279，R2＝0．8845，并利用2013年试验数据对模型进行了验证。