Genetic Diversity Analysis of Fruit Vitamin C Content in Cucumber Core Germplasm
WANG Zhuangzhuang1，2☆，DONG Shaoyun2☆，ZHANG Congying3，GU Xingfang2，MIAO Han2，LIU Xiaoping2，GUAN Jiantao2，XU Kuipeng1*，ZHANG Shengping2*
〔1College of Horticulture，Qingdao Agricultural University，Qingdao 266000，Shandong，China；2State Key Laboratory of Vegetable Biobreeding，Institute of Vegetable and Flowers，Chinese Academy of Agricultural Sciences，Beijing 100081，China；3China Vegetable Seed Technology Co.，Ltd.（Beijing），Beijing 100081，China〕
Abstract：Cucumber is an important vegetable crop in China，and the vitamin C（VC）content is an important indicator of the intrinsic quality of cucumber fruit．The VC content in fruits of 106 cucumber core accessions planted in different seasons were determined by UV spectrophotometry，the genetic diversity was analyzed and high VC content germplasm was screened．The results showed that the VC content of cucumber fruit was significantly affected by seasons，with a strong correlation between the two springs and weak correlation between spring and autumn．Overall，the VC content of Indian type germplasm fruits was higher than that of East Asian type，European type and Xishuangbanna type．The results of cluster analysis showed that when the Pearson correlation coefficient was 2，64 cucumber core germplasm were divided into four clusters according to fruit VC content，and four accessions with high VC content including‘TGR 580’‘Tangqiuxuan’‘Lyubaoshixuan’and‘Dacihuanggua’were selected．
