【摘要】 利用马铃薯栽培种亲本组配的 6× 6完全双列杂交 (包括反交 ) ,对该性状 (以相对热损伤率RI %表示 )进行配合力和杂种优势分析。结果表明 :①该性状的一般配合力效应 (GCA) ,特殊配合力效应 (SCA)和反交效应 (R)均达极显著水平。上述 3因素相对作用大小南、北马铃薯分别为 3 9∶1∶1 6和 2 1∶1∶0 5 ,说明该性状的遗传虽以加性基因效应占一定优势 ,但非加性基因效应和反效应也起重要的作用。②此性状受质核互作和 (或 )细胞质的明显影响。③一些杂种F1的细胞膜热稳定性具有明显的杂种优势 ,并存在超亲遗传现象。这将为马铃薯的耐热性遗传改良和杂种优势利用提供依据。更多还原

【Abstract】 The cell membrane themostability is known to be a better physiological parameter for identifying heat-tolerance of potato in the field.In this study two sets of 6×6 complete diallel(including reciprocals),one from six south and another from six north potato cultivars,were used to investigate the combining ability and heterosis of this trait expressed as relative injury(RI%).Results showed that 1)general combining ability(GCA),specific combining ability(SCA)and reciprocal(R)effects were all highly significant,their meansquare ratios being 3.9∶1∶1.6 and 2.1∶1∶0.5 for south and north potato respectively,which indicated that non-additive and reciprocal effects were also important in the genetic control of this trait;2)obviously,cytoplasmic atcion and /or nucleo-cytoplasm interaction existed in this trait;and 3)heterosis of membrane thermostability of some F 1 s was remarkable,and the transgressive inheritance of this trait was observed.These findings might be informaive for improving heat-tolerance in pure line potato and hybrid potato breeding programs.更多还原