黄瓜苗期低温弱光下MDA含量主基因-多基因联合遗传分析

Genetic Analysis of Major Gene-Multi Genes of Cucumber Seedling MDA Content in Low Temperature and Weak Light

选取耐低温弱光性不同的2份黄瓜材料9507、9517及其配制的BC1、BC2、F1、F2等6个世代,进行低温弱光处理,每天光照处理7.5 h,强度为30μmol·m-2·s-1,约合2 000 lx,白天12℃,晚上8℃,共处理14 d.运用主基因-多基因联合遗传模型方法研究丙二醛(MDA)含量的遗传规律,并估算遗传参数.结果表明MDA含量的遗传受2对加性-显性-上位性主基因+加性-显性多基因控制,2对主基因的加性效应均为负向效应,其显性效应也均为负向,差异不大.总加性效应与总显性效应均为较大的负向效应.分离世代中,主基因的遗传率均比多基因的遗传率高,环境方差对表型方差的影响占有绝对优势,即低温弱光条件下环境对MDA含量的遗传起很大作用,对于这个性状适于晚代选择.

The materials of 9507,9517 and their BC1, BC2, F1, F2 were carried on low-temperature treatments,12/8℃ in day/night,with 7.5 h everyday by the light intensity of 30 μmool · m^-2 · s^-1（or 2 000 lx） for 14 days,which were different in tolerance of low temperature and weak light. The genetic rule of MDA content was researched by the host gene-multi genes blending inheritance model method, and the genetic parameter was also estimated. The results indicated that the MDA content inhereted with 2 pair of additive- dominant-epistasis major genes＋additive-dominance multi-genes. The additive effect is the negative direction effect and the dominant effect also is the negative direction, the difference is not big. The total additive effect and the total dominant effect were negative direction. In the separation generation,the main gene he- redity rate is higher than the multi-genes heredity rate, the environment variance synchronizing watches variance influence holds the absolute superiority. In other words, under the low temperature condition envi- ronment plays the very major role for the MDA content. The trait is suitable for the late generation selection regarding this character.