Genetic Analysis of Fruit Spine Base Size in Cucumis sativus
DI Sheng-qiang,LI Hao,LUAN Qian-qian,WANG Li-na,LI Qiang,REN Zhong-hai*
(College of Horticultural Science and Engineering,Shandong Agricultural University,Shandong Collaborative Innovation Center of Fruit & Vegetable Quality and Efficient Production,Key Laboratory of Biology and Genetic Improvement of Horticultural Crops in Huang-Huai Region,Ministry of Agriculture,State Key Laboratory of Crop Biology,Tai’an 271018,Shandong,China)
In order to explore the genetic law of cucumbers fruit spine base size,this paper took 2 cucumber inbred lines CNS5 with large fruit spine base and RNS4 with small fruit spine base as parents to construct 6 generations:P1,F1,P2,B1,B2 and F2;and utilized the major gene + polygene mixed inheritance model to
analyze the phenotypic values of cucumber fruit spine base size.The results indicated that inheritance of cucumber fruit spine base size conforms to C-0 model,namely additivity-dominance-epistasis polygene model.Multi-gene additive,dominant and epistatic effects were all positive.Additionally,the polygene inheritabilities in F2 from 2016 and 2017 were 79.21% and 71.25%,respectively,which was relatively higher.The environmental effects in F2 was 20.79% and 28.75%,respectively,which had relatively smaller influence.Therefore,this study has provided a foundation for exploring genes related to fruit spine base size.As strategy for gene mapping,selecting high generation backcross populations will have better effect.