黄瓜苗期低温弱光下生长速度主基因-多基因联合遗传分析

 【目的】通过低温处理黄瓜幼苗,对耐寒性进行遗传分析。【方法】选取在低温弱光条件下生长速度不同的2份材料9507、9517及其配制的BC1、BC2、F1、F2等6个世代,进行低温处理,每天光照处理7.5 h,强度为30 µmol•m-2•s-1,约合2 klx,昼/夜温度为12/8℃,共处理14 d。运用主基因-多基因混合遗传模型方法研究生长速度的遗传规律,并估算遗传参数。【结果】生长速度的遗传受2对加性-显性主基因+加性-显性多基因控制,2对主基因的加性效应相同,显性效应略有不同,总加性效应很大。主基因+多基因遗传率占非常大的优势,环境方差对表型方差的影响很小。【结论】生长速度性状受环境影响较小,适于早代选择。

Genetic Analysis of Seedling Growth Rate of Cucumber Under Low Temperature and Weak Light Conditions

【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.