| 摘要: |
| 【目的】研究桃成熟期的遗传规律,为桃杂交育种合理选配亲本提供科学依据。【方法】利用果树遗传学常规分析方法,对来自17个桃杂交组合1 345个后代植株的成熟期遗传规律进行了研究。【结果】(1)桃果实成熟期为数量性状,呈现趋中变异,变异系数为7.1%～26.8%,平均组合传递力为97.2%,狭义遗传力估算值为0.83;(2)可能存在控制桃成熟期的主效基因;(3)桃成熟期性状存在明显的超亲遗传现象,在所有组合中,早于早熟亲本的杂种后代比例平均为25.4%,晚于晚熟亲本的杂种后代比例平均为17.8%;(4)早熟材料76-2-12、沪005育种值高,传递力强,是培育特早熟桃的理想亲本。【结论】桃成熟期为数量性状遗传,但存在着主效基因,根据成熟期遗传趋向选择合适的亲本,可大大提高桃成熟期的育种效率。 |
| 关键词: 桃 杂交育种 成熟期 遗传规律 |
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| 基金项目:国家“十五”科技攻关项目（2002BA515B10）；陕西省“十一五”科技攻关项目（2006K01-G27-01） |
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| Study on the genetic tendency of peach maturity date of crossed progenies |
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| Abstract: |
| 【Objective】 The aim was to study the inheritance of peach maturity date and to provide scientific guidance for parents selection in crossing-breeding of peach. 【Method】 Using traditional method of fruit genetics,1345 peach progenies from 17 crossed combinations were used to study the inheritance of maturity date. 【Result】 (1) The trait of maturity date of peach was controlled by quantitative genes, and appeared central tendency,the range of coefficient of variability was between 7.1％ and 26.8％,and its average heritability of all combination and narrow heritability were 97.2% and 0.83 respectively.(2) The major genes could act in inheritance of maturity date.(3) The transgressive inheritance could be suggested clearly，in all crossing combinations,the average percentages of hybrids with earlier maturity date than the early parent and those with later maturity date than the late parent were 25.4% and 17.8% respectively.(4) Breeding value and trait heritability of two cultivars with early maturity,‘76-2-12’and‘Hu 005’,were higher than that of other varieties,so they could be used as ideal parents with early maturity in peach breeding.【Conclusion】 The maturity date of peach was controlled by quantitative genes,but major genes took into effects.The efficiency of breeding could be improved by selecting parents according to the genetic tendency of peach maturity. |
| Key words: peach crossbreeding maturity date genetic tendency |
