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| QTL Mapping Analysis of Cucumber Architecture |
| GUO Jiangyi1，2，XIN Tongxu2，ZHANG Mengzhuo2，WANG Shuai2，WANG Shenhao2*，YANG Xueyong2，1* |
| 1College of Horticulture，Qingdao Agricultural University，Qingdao 266109，Shandong，China；2Institute of Vegetables and Flowers，Chinese Academy of Agricultural Sciences，State Key Laboratory of Vegetable Biobreeding，Beijing 100081，China |
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Abstract Plant architecture is a significant factor affecting yield and cost input in agricultural production．Mapping QTLs related to plant architecture in cucumber will provide essential reference for genetic improvement of cucumber architecture．In this work，129 recombinant inbred lines which originated from a narrow-cross between cucumber cultivar‘Xintaimici’and wild cucumber‘PI183967’was constructed，and phenotypic investigation related to cucumber architecture was also conducted．At the same time，genetic linkage map was constructed based on resequencing data of parents and recombinant inbred lines，and then QTL mapping analysis related cucumber architecture was performed．The results indicated that the genetic linkage map containing 598 bin markers was constructed，the genetic linkage map’s overall distance is 1 353 cM，and the average physical distance between two bin markers is 352.8 kb．QTL mapping analysis for plant height，internode length，internode number，branch number and Stem diameter was conducted．A total of 7 QTLs were detected，including 2 QTLs for plant height，2 QTLs for internode length，1 QTL for internode number，1 QTL for branch number and 1 QTL for stem diameter．Nine causative genes preliminarily were filtered and predicted by the annotated data and literature．
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