Abstract
As compared with normal-oleic peanuts, high-oleic peanuts proved to be heart-healthier and had a prolonged shelf life and extended seed longevity. However, there have been concerns about the genetic diversity of present-day high-oleic peanut cultivars, which relied heavily on high-oleic donors with F435 type FAD2 mutations. In the study, a total of 104 high-oleic peanut cultivars/lines/mutants from main breeding teams in China were used to assess their genetic diversity with AhMITE markers. Of all the 31 cultivars tested, those from CTW (Chuan Tang Wang) team had the highest genetic variability. Again, of all the 73 lines studied, those from the same team ranked first in genetic diversity. As compared with cultivars from CTW and C&Y (Xiao Yuan Chi and Shan Lin Yu) teams, greater genetic diversity was detected in new lines of both teams, indicating that recent breeding efforts had resulted in improved genetic diversity in high-oleic peanuts.
Highlights
High-oleic peanut is advantageous over its normal-oleic counterpart, having prolonged shelf life, extended seed longevity and several health benefits
A total of 104 high-oleic peanut cultivars/lines/mutants from main breeding teams in China were used to assess their genetic diversity with AhMITE markers
As compared with cultivars from CTW and C&Y teams, greater genetic diversity was detected in new lines of both teams, indicating that recent breeding efforts had resulted in improved genetic diversity in high-oleic peanut
Summary
High-oleic peanut is advantageous over its normal-oleic counterpart, having prolonged shelf life, extended seed longevity and several health benefits. Hu et al (2013) utilized 12 SSR (simple sequence repeat) primer pairs in the analysis of 5 high-oleic peanut genotypes along with a normal-oleic cultivar (Huayu 22). Yu et al (2017) used 31 SSR primer pairs to assess the genetic diversity of 41 high-oleic peanut cultivars/lines. In the study by Wang et al (2020), genetic distance of 25 high-oleic peanut cultivars/lines, as revealed by 140 SSR primer pairs, ranged from 0.057 to 0.624, with a mean value of 0.451. Guo et al (2020) used 217 SSR primer pairs to study the genetic diversity of 8 high-oleic peanut cultivars bred at KFAAF and found that similarity coefficient was 0.3438–0.9688, with a mean value of 0.6149
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