蕃茄几个数量性状配合力的分析

本文对产量、平均单果重、单株结果数、可溶性固形物含量、红色素含量五个性状进行了一般配合力和特殊配合力分析。结果表明,除红色素一般配合力显著而特殊配合力不显著外,其余四个性状无论在模型Ⅰ或模型Ⅱ都显著。表明红色素含量这个性状主要是基因累加效应,而产量等性状既有累加效应又有非累加效应。根据估算遗传力来看,红色素含量、可溶性固形物遗传力比较高,而产量、平均单果重、单株结果数的遗传力比较低。所以对红色素、可溶性固形物在早期世代可进行选择,而单果重、单株结果数、产量在后期世代加以选择效果更理想。

ANALYSIS OF COMBINING ABILITIES OF SEVERAL QUANTITATIVE CHARACTERS OF TOMATO

The analytical results indicate that the combining abilities of all other four characters appear significant both in modelⅠand modelⅡ, except in the ordinary combining ability of lycopene content is significant but its specific one is unsignificant. Therefore, the use of pedigree method which might give better effect is re-commended to breed tomato for preserving and canning purpose. The results also express that lycopene content is mainly a character of accumulative effect of gene, while the yield and other characters have both accumuative and nonaccumulative effect of gene. The effective values of general combining ability are various between cultivars. Those values of Rome No1 and Rome VF show significantly positive heterosis, except for the average weight per fruit. The value of fluctuated variance is large in specific combining ability of Rome No1, it shows that Rome No1 acting as crossing parents has various appearances. Some assortments of gene are very good, but some of them appear badly. The variance value of specific combining ability of Rome VF is small, it shows that those characteristics including lycopene and soluble contents, average weight per fruit etc can be passed on uniformly from Rome VF acting as parent plant to its F_1 generation. Rome No1 and Rome VF may be considered as rather good parent materials for brceding of preserving and canning tomato varieties, especially the latter. By the estimation of inheritance ability, it was found that the ability of lycopene and soluble solid contents are higher than that of yield, average weight per fruit and fruits number per plant. Therefore, such characters as lycopene and soluble solid contents can be selected at earlier generation, while the average weight per fruit, fruits number per plant and yield had better be selected at later generation.