Comparison of Yield Characters among the Hybrid Populations of Potato Having Different Wild Relatives in Their Ancestry

[摘要] In order to clarify the effect of wild relatives on the yield characters of their progenies, the tuber fresh yield, starch content and starch yield were compared among the populations of the first clonal generation derived from one male parent and 36 female parents which had different wild relatives in their ancestry. The populations derived from the parents of CP group which had S. chacoense or S. phureja in the ancestry, tended to be higher in the starch content and starch yield compared with those from the parents of T group which had no wild relatives in the ancestry, and DW group which had the wild relatives other than S. chacoense or S. phureja in the ancestry (Table 1). The variations among the hybrids of each population in the starch content and starch yield also tended to be larger in the populations of CP group compared with those of T and DW groups. Although the starch yield showed significantly positive correlation with both tuber fresh yield and starch yield among all populations, the difference in the starch yield among the populations with its higher values was mainly due to the difference in the starch content (Fig. 1). Since the starch yield highly correlated with the tuber fresh yield among the hybrids of each population, the difference in the starch content between the populations was clearIy exhibited by the difference in the regression lines between the starch yield and tuber fresh yield among the hybrids of each population (Fig. 2). From these results, we concluded that using the parents of CP group for breeding crosses was more effective to get a new cultivar with high starch content and starch yield.

[学科分类] 农业科学（综合）

[关键词] Breeding;育種;First clonal generation;塊茎収量;Potato;近縁野生種;Starch content;第1次栄養繁殖世代;Starch yield;澱粉価;Tuber fresh yield;澱粉収量;Wild relatives;バレイショ