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作物学报 ›› 2008, Vol. 34 ›› Issue (03): 376-381.doi: 10.3724/SP.J.1006.2008.00376

• 作物遗传育种·种质资源·分子遗传学 • 上一篇    下一篇

甘蓝型油菜(Brassica napus L.)抗倒伏性状的主基因+多基因遗传分析

顾慧1;戚存扣2,*   

  1. 1南京农业大学农学院, 江苏南京;2 江苏省农业科学院经济作物研究所，江苏南京210014
  • 收稿日期:2007-07-19 修回日期:1900-01-01 出版日期:2008-03-12 网络出版日期:2008-03-12
  • 通讯作者: 戚存扣

Genetic Analysis of Lodging Resistance with Mixed Model of Major Gene Plus Polygene in Brassica napus L.

GU Hui1,QI Cun-Kou2,*   

  1. 1 Agronomy College of Nanjing Agricultural University, Nanjing 210095, Jiangsu; 2 Institute of Industrial Crops, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, Jiangsu, China
  • Received:2007-07-19 Revised:1900-01-01 Published:2008-03-12 Published online:2008-03-12
  • Contact: QI Cun-Kou

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摘要： 应用植物数量性状主基因+多基因混合遗传模型多世代联合分析方法，研究了甘蓝型油菜浙平1号×04Pb11(I)和宁1243×04Pb11(II)的P1、P2、F1、B1、B2和F2 6个世代初花期单株抗压力的遗传。结果表明：抗倒伏性状的遗传在组合I受2对加性-显性-上位性主基因+加性-显性-上位性多基因控制，在组合II受2对加性-显性-上位性主基因+加性-显性多基因控制；2个组合中的2对主基因都以加性效应为主，都表现抗倒对易倒部分显性或完全显性，2对主基因间存在明显的基因互作效应；2个组合中，F2群体主基因遗传率平均为54.71%，而多基因遗传率只在B1群体中检测到，平均为10.56%，表明2个组合的抗倒伏性状是以主基因遗传为主，应在早期世代进行选择；2个组合各群体中，遗传变异平均占表型变异的53.43%，而环境变异平均占表型变异的46.57%，表明环境对油菜抗倒伏性状的影响比较大。

关键词: 甘蓝型油菜, 主基因+多基因, 抗倒伏, 遗传

Abstract: Rapeseed is one of the most important oil crops in the world. Lodging damage results in not only lower seed yield and oil quality, but also easier infection to the infection of Sclerotinia and more difficulties for mechanized harvest. So it is of a great significance to study lodging resistance in B. napus L. However, lodging is a complex trait associated with several factors. It is difficult to evaluate in field. In this paper, inheritance of lodging resistance was analyzed applying the joint segregation analysis of a mixed genetic model of major gene plus polygene in six generations (P1, P2, F1, B1, B2, and F2 ) derived from two crosses of Zheping 1 (lodging resistance) × 04Pb11 (lodging) (Cross I) and Ning 1243 (lodging resistance) × 04Pb11 (Cross II) in B. napus L. Resistant pressure per plant (RPPP) was measured at flowering time by Digital Force Gauge, which was used to assess the ability of lodging resistance, and the correlation between RPPP and lodging scale was scored at mature time (r = -0.38, P≤0.01). The results showed that lodging resistance was dominated by two major genes with additive-dominance-epistatic effects plus polygenes with additive-dominance-epistatic effects (E-0 model) in Cross I, and two major genes with additive-dominance-epistatic effects plus polygenes with additive-dominance effects (E-1 model) in Cross II. The additive effects of two major genes in two crosses were more powerful than the dominant one (︱h/d︱＜1). On average, Hereditability of major genes (hmg2) was 54.71% in F2 population, and that of polygenes (hpg2) only detected in B1 population was 10.56%. It indicated that the lodging resistance in B. napus L. was dominated by major genes. In addition, the environmental variance and the genetic variance accounted for 46.57% and 53.43% of the phenotypic variance in each population respectively, indicating that the environmental factors have a great effect on lodging in B. napus L.. However, higher hereditability of major genes can be favorable to an efficient selection in early generation of lodging resistance breeding.

Key words: Brassica napus L., Major gene plus polygene model, Lodging resistance, Genetic analysis

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