摘要
Sweetpotato virus disease (SPVD) is due to the dual infection and synergistic interaction of Sweetpotato feathery mottle potyvirus (SPFMV) and Sweetpotato chlorotic stunt crinivirus(SPCSV), and causes up to 98% yield loss in sweetpotato in East Africa. This study was conducted to determine the inheritance of resistance to SPVD in sweetpotato and to estimate the nature of genetic variance. Ten parental clones varying in reaction to SPVD were crossed in a half diallel mating design to generate 45 full-sib families. The families were graft-inoculated with SPCSV and SPFMV to induce SPVD and evaluated for resistance in a randomized complete block design at two sites in Namulonge, Uganda during 1998–2000. In serological assays for SPFMV and SPCSV,resistance to symptom development and recovery from initial systemic SPVD symptoms, characterised resistant genotypes. Genetic component analysis showed significant effects for both general combining ability (GCA) and specific combining ability (SCA) for resistance to SPVD. GCA to SCA variance component ratios were large (0.51–0.87), hence GCA effects were more important than SCA effects. Resistant parents exhibited high GCA indicating that additive gene effects were predominant in the inheritance of resistance to SPVD and recovery. Narrow-sense heritability (31–41%) and broad-sense heritability (73–98%) were moderate to high, indicating that rapid genetic gains for SPVD resistance could be accomplished by mass selection breeding techniques. Two genotypes, New Kawogo and Sowola, had high negative GCA effects and had several families in specific crosses,which exhibited rapid recovery from SPVD,and are promising parents for enhancement of SPVD resistance and recovery.
摘要译文
甘薯病毒病（SPVD）是由于双重感染和甘薯羽状斑驳马铃薯Y病毒（SPFMV）和甘薯褪绿特技crinivirus协同相互作用（SPCSV），并导致了在甘薯98％，产量损失在东非。这项研究是为了确定电阻的继承SPVD的甘薯和估计遗传变异的性质。十反应SPVD变化的父母克隆越过半双列交配设计产生45全同胞家系。家庭是移植接种在Namulonge两个站点与SPCSV和SPFMV诱导SPVD和评价性完全随机区组设计，乌干达1998-2000。在血清学测定法SPFMV和SPCSV，耐从初始全身SPVD症状的症状的发展和恢复，其特征在于抗性基因型。遗传成分分析表明两个一般配合力（GCA）和特殊配合力（SCA）的抗SPVD显著的效果。GCA到SCA方差分量比分别为大（0.51-0.87），因此GCA效应比SCA效应更重要。耐父母具有较高的GCA表明加性效应占主导地位的耐SPVD和恢复的继承。狭义遗传力（31-41％）和广义遗传力（73-98％）为中度到高度，这表明快速遗传增益SPVD阻力可以通过质量选择育种技术来完成。两种基因型，新Kawogo和Sowola，具有较高的负GCA效应并有几个家庭在特定的十字架，其展出来自SPVD迅速恢复，并承诺家长增强SPVD性和恢复。
Robert O.M. Mwanga [1] G. Craig Yencho [2] James W. Moyer [3]. Diallel analysis of sweetpotatoes for resistance to sweetpotato virus disease[J]. Euphytica, 2002,128(2): 237-248