The Combining Ability Analysis, Parents Selecting And Crosses Mating In Potato (Solanum Tuberosum) In Yunnan Province

A study was conducted on 22 crosses from 10 varieties including mira variety to evaluate for 7 characters of plant including plant's vigor and for 8 characters of tuber including tuber yield in the first clonal year potato crops. It was first reported the combining ability research for tubers flesh color, flowering qualities, separating of plant's shapes and heights, color separating of stems and flowers in the progeny's inheritance in potato crops. The results indicated:1. Non-additive gene actions of separating of plant's shapes and heights, color separating of stems, flowering qualities, skin-color, tuber yield and the number of tubers were from 66.8% to 93.0%, and more important than additive gene actions in the progeny's inheritance. It was opposite to the progeny's inheritance of late blight and single tuber weight. These male genetic actions were 65.2%, 56.7%. Female genetic actions and non-additive gene actions were 40.5%, 44.9% in the progeny's inheritance of starch content. And both additive and non-additive gene actions were found to have the same importance with a preponderance of the later in the inheritance of plant vigor, color separating of flowers, flesh color, tuber shape and appearance.2. HZ23, HZ88, K6 and N7 were 4 superior parents for various characters synthetically. ZHXW and XWYY were two characteristic parents for purple flesh. MiraxK6, Hui-2xK6, HZ23xK6, Hui-2xN7, HZ23xN7, HZ88xN7, HZ23xZHXW, and HZ88xZHXW were promising crosses.3. The potato varieties resource of CIP (International potato center) would be the most important parents in the breeding system in yunnan. The varieties were introduced from other places couldn't utilized directly, but some of these varieties could be used as parents, for example, neishu7 and kunyin6.4. Progeny means of crosses involving both or at least one parent with good general combining ability were, in general, higher than other cross combinations for various characters including plant' s vigor and late blight. Selection of parents based on their general combining ability and crossing then in all possible combinations to select the best single plant or true-seed potato crosses by progeny test would be a suitable breeding strategy for potato crops.5. A hypothesis was supposed that the genetic of flesh color was red or purple partly was controlled by tiny effect polygene. The number of tiny effect polygene determined red or purple and shade of color.