| As the establishment and rapid expansion of potato processing industry in China, development of various purpose varieties becomes a priority of potato breeding in China, and the choice of parents and evaluation of crosses are prerequisite for a successful variety release. In this research, 8 varieties (clones) with various traits were chosen and crossed in incomplete diallel design. Fifteen crosses, including their parents, were evaluated in the first clonal generation in a random complete block design for main agronomic traits, yield components, and quality index. Data were subject to analyze by analysis of variance and frequency distribution in order to understand trait distribution in various crosses. Fuzzy mathematics was used to evaluate and select crosses of different uses. Combining ability was made to find superior parents. 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 processing traits, Zhukefu×T1800 and Dongnong 303×T1800 were considered high yielding crosses and the percentage of clones with tuber yield more than 800 g for these two crosses were 42% and 31%, respectively; Zhukefu×Kexin 16 and Zaodabai×Kexin 16 yielded high percentage of large sized tubers, clones with mean tuber weight more than 100 g accounting for 36% and 33%, respectively; Zhukefu×Kexin 16 and Dongnong 303×Kexin 16 was high in marketable tubers and the percentage of clones with marketable yield more than 75% was 44% and 39%, respectively; Atlantic×T1800 and Ns880407×Ke 200029-26 were high in specific gravity, and the percentage of clone with more than 1.085 was 44% and 36%, respectively; Atlantic×T1800 and Atlantic×Ke200029-26 performed well for their low reducing sugar contents and light chip color, with the percentage of clones with 0.2% or less sugar content being 64% and 49% and the percentage of clones with 70 scores or more for their chip color being 85% and 79%, respectively.2. Based on comprehensive evaluation by using fuzzy mathematics for the main traits of fifteen crosses, Ns880407×T1800, Atlantic×T1800 and Atlantic×Ke20009-26 were potential crosses for breeding for processing of frying products and potato granule; Atlantic×T1800 and Ns880407×Ke20009-26 were considered to be the best crosses from which starch processing varieties may be selected. 3. According to analysis of combining ability for the fifteen crosses, Atlantic was high in GCA for low reducing sugar, high specific gravity, light chip color, and mean tuber weight; Ke200029-26 was high in GCA for both low reducing sugar and light chip color; Ns880407 was high in GCA for specific gravity; Zhukefu was high in GCA for tuber yield per plant and marketable tuber percentage; Kexin 16 was high in GCA for mean tuber weight and marketable tuber percentage; T1800 was high in GCA for tuber yield per plant.4. Reducing sugar content, specific gravity, main stem number, chip color, tuber number per plant and marketable tuber percentage had high GCA, indicating that additive effect was obvious for these traits. Mean tuber weight, tuber yield per plant, and plant height were controlled by both additive and non-additive effects. Ns880407×T1800 and Atlantic×T1800 had high SCA for low reducing sugar; Atlantic×T1800 and Zaodabai×Kexin 16 had high SCA for specific gravity; Atlantic×T1800 and Dongnong 303×Kexin 16 had high SCA for chip color; Ns880407×Kexin 16 and Zaodabai×T1800 had high SCA for tuber yield per plant.5. Some crosses and clones were selected. Sixty clones with low reducing sugar, light chip color, and adequate specific gravity and 32 clones with high starch content (specific gravity more than 1.11) were identified, and the best cross was Atlantic×T1800, then followed by Ns880407×Ke200029-26, Ns880407×T1800 and Atlantic×Ke200029-26. Twenty five clones with resistant cold-sweetening, and 87 clones with good reconditioning ability were found, and the top 4 crosses from which the abovementioned clones were selected were Atlantic×T1800, Atlantic×Ke200029-26, Ns880407×T1800, and Ns880407×Kexin-16.
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