Abstract:

【Objective】 Heredity of chilling tolerance was analyzed in Cucumis sativus L. by carrying on low-temperature treatments. 【Method】 In low-temperature treatments,i. e. 12/8℃ in day/night, with 7.5 hours every day, and light intensity at 30 μmol•m-2•s-1 (or 2 klx) for 14 days, 9507, 9517 and their combinations BC1, BC2, F1, F2 and so on 6 generations, with different growth rates were used in experiment. The host gene - multi gene blending inheritance model method was used to study the genetic rule of growth rate, and estimate the genetic parameters. 【Result】 The growth rate heredity was controlled by 2 pairs of additive – dominant- major gene + additive - dominant multi-genes, and the 2 pairs of host genes additive effect were the same, the dominant effect was slightly different, the total additive effect was very big. The main gene + multi- gene heredity rate occupied an extremely large superiority, and the environment variance had very influence on phenotypic variance. 【Conclusion】 Under the low temperature condition environment plays a very little role in the heredity of growth rate and it is suitable for the selection in early generation.

Key words: cucumber (Cucumis sativus L.), low temperature and weak light, growth speed, host gene-multi-genes, heredity