Segregation Of Fried And Starch Quality And Combing Ability Of Parents In Potato

In order to promote economic growth, developing countries have gradually established potato processing industry in recent years. Development of various purpose varieties also becomes a priority of potato breeding in China. In view of the lack of excellent crosses and suitable breeding varieties of parental status,8 varieties (clones) with various traits were chosen and crossed in incomplete diallel design in this research.. Fifteen crosses, including their parents, were evaluated in the second clonal generation in a random complete block design for main agronomic traits, yield components, fried and starch quality index. Data were subject to analyze by analysis of variance and frequency distribution in order to understand trait distribution in various crosses. Combining ability was made to find superior parents crosses. The selected clones will be basic and further used in potato breeding. The results shed light on parent choice, crossing, and eventually development of new varieties suitable for processing.1.After comparison of various crosses for yield component and quality traits, Zhukefu×Kexin 16 and Zaodabai×Kexin were considered excellent yield component crosses; Atlantic×Ke 200029-26 and Ns880407×Ke 200029-26 were high in specific gravity; Atlantic×T1800 and Atlantic×Ke 200029-26 performed perfect for their light chip color; Dongnong 303×Kexin 16 and Ns880407×Kexin 16 were low in amylose content; Dongnong 303×T1800 and Atlantic×T1800 were low in gelatinization temperature; Zhukefu×Kexin 16 was the highest standard of starch viscosity cross according to GB.2.According to analysis of combining ability for the fifteen crosses, Dongnong 303, Ke 200029-26 and Zhukefu was high in GCA for yield component; Atlantic and Ke 200029-26 was high in GCA for light chip color;Ns880407 and Ke 200029-26 was high in GCA for high specific gravity; Zaodabai, T1800, Dongnong 303, Atlantic and Kexin 16 was high in GCA for starch quality respectively.3.Ns880407×Kexin 16 and Atlantic×T1800 had high SCA for tuber yield per plant; Dongnong 303×Kexin 16 and Ns880407×T1800 had high SCA for chip color; Atlantic×T1800 and Zhukefu×T1800 had high SCA for specific gravity; Dongnong 303×Kexin 16 and Zaodabai×Ke 200029-26 had high SCA for low amylose content; Atlantic×Kexin 16 and Dongnong 303×Ke 200029-26 had high SCA for low gelatinization temperature; Atlantic×Ke 200029-26 and Ns880407×T1800 had high SCA for starch viscosity.4.Amylose content, gelatinization temperature, specific gravity, marketable tuber percentage, tuber number, main stem, starch viscosity, chip color, tuber yield per plant and plant height had high GCA, indicating that additive effect was obvious for these traits.Tuber weight was controlled by both additive and non-additive effects.5.eighty one crosses and clones were selected. seventeen clones with perfect chip color, the best cross was Atlantic×T1800, then followed by Dongnong 303×Ke 200029-26;5 clones with high starch content (specific gravity more than 1.11) were identified, Atlantic×Ke 200029-26 was the best cross. Fifity nine clones with high starch viscosity standard according to GB, the best cross was Zhukefu×Kexin 16 and better was Dongnong 303×Kexin 16...