黄瓜苗期低温弱光下耐低温性主基因-多基因联合遗传分析
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“十五”辽宁省科技攻关课题(2002215004)、山西省农业科学院博士基金(ybsjj0909)


Genetic Analysis of Chilling Tolerance of Cucumber Seedling Under Low Temperature and Weak Light Using Major Gene Plus Polygenes Inheritance Model
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    摘要:

    选取耐低温弱光性不同的2份材料9507、9517及其配制的BC1、BC2、F1、F2等6个世代,进行低温弱光处理,每天光照处理7.5h,强度为30μmol/m2·s,约合2000 lx,白天12℃,晚上8℃,共处理14d。运用主基因-多基因联合遗传模型方法研究耐低温性的遗传规律,并估算遗传参数。结果表明耐低温性的遗传受2对加性主基因+加性-显性多基因控制,F1平均值略低于中亲值,主基因的遗传率为62.871~79.310%,多基因的遗传率为3.448~7.792%,主基因+多基因的遗传率为74.026~82.759%,环境方差占表型方差的比率为17.241%~25.974%。即低温弱光条件下环境对耐低温性的遗传起很小作用,对于这个性状适于早代选择。

    Abstract:

    Materials 9507, 9517 and their BC1, BC2, F1, F2 and so on 6 generations were carried under low-temperature treatments, 12/8℃ in day/night, with 7.5 h everyday by the light intensity of 30μmol/m2·s (or 2000 lx) for 14 days,which were difference in tolerance of low temperature and weak light. The dominat and additive effects of chilling tolerance was researched by the major gene - polygenes inheritance model,and the genetic parameters were estimated. The results indicated that the chilling tolerance index was controlled by 2 pairs of additive major genes plus additive - dominance polygenes, and the average of chilling tolerance index of F1 was higher than midparent value. The heritability of major gene was 62.871~79.310%, the heritability of polygenes was 3.448~7.792%, and the heritability of major gene plus polygenes was 74.026~82.759%.In other words under the low temperature condition, the environment plays a very little role for the chilling tolerance in Cucumis sativus L., which is suitable for being chosen in the early generation .

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闫世江,司龙亭,张建军,等.黄瓜苗期低温弱光下耐低温性主基因-多基因联合遗传分析[J].植物遗传资源学报,2011,12(2):281-285.

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