15个大果番茄自交系果实性状的配合力与遗传力分析

Combining ability and heritability analysis of fruit traits of 15 large fruit tomato inbred lines

配合力与遗传力分析对于评价和筛选优良自交系材料与杂交组合选配具有重要意义。本研究以15个大果番茄自交系为材料,按照NCⅡ不完全双列杂交法,配制成36个杂交组合,对单果质量、果洼处木栓化大小、果实纵径、果实横径、果形指数、果实硬度、果肉厚和可溶性固形物含量共8个果实性状进行配合力与遗传力分析。结果表明,8个果实性状在组合间均有极显著差异;果实性状的配合力方差分析中除果形指数外其他均呈极显著差异。母本ZJ20431、ZJ20436、ZJ20437、ZJ20440与父本ZJ20035的一般配合力相对效应值较高;组合ZJ20431×ZJ20035与ZJ20433×ZJ20037的特殊配合力相对效应值较高。果形指数和果洼处木栓化大小在杂交后代中主要受基因型中的加性效应影响;而果肉厚和可溶性固形物含量主要受到非加性效应的影响,可通过优势杂交育种途径加以利用。除果形指数外的7个性状广义遗传力较大,而狭义遗传力普遍较低,适宜在晚期世代进行选择。本研究结果为宁夏地区大果番茄优良亲本选择与新品种的选育提供了理论参考。

Combining ability and heritability analysis is of great significance for the evaluation and screening of excellent inbred line materials and the selective breeding of hybrid combinations.In this study,15 tomato inbred lines with large fruits were used as materials,36 hybrid combinations were prepared according to NCⅡincomplete diallel hybrid method.Combining ability and heritability analysis of eight fruit traits were made,including single fruit mass,cork size of fruit stem depression,vertical diameter of fruit,transverse diameter of fruit,fruit shape index,fruit hardness,flesh thickness,soluble solid content.The results showed that,there were extremely significant differences of eight fruit traits between different combinations.The variance analysis of combining ability of fruit traits showed that,the difference was extremely significant except for fruit shape index.The relative effect value of general combining ability(GCA)of female parent ZJ20431,ZJ20436,ZJ20437,ZJ20440 and male parent ZJ20035 was high.The relative effect value of the special combining ability of the combinations of ZJ20431×ZJ20035 and ZJ20433×ZJ20037 were high.The fruit shape index and cork size of fruit stem depression in filial generations were mainly affected by additive effect of genotype.The flesh thickness and soluble solid content were mainly affected by non additive effects and could be utilized through heterosis crossbreeding approaches.Except for the fruit shape index,the broad heritability of the seven traits was relatively high,while the narrow heritability was low in general.Therefore,the traits were suitable for selection in the late generations.This study can provide theoretical reference for the selection of excellent parents and breeding of new varieties of large fruit tomato in Ningxia area.