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园艺学报 ›› 2019, Vol. 46 ›› Issue (11): 2129-2142.doi: 10.16420/j.issn.0513-353x.2018-1029

• 研究论文 • 上一篇    下一篇

板栗和锥栗种间杂交F1代叶片表型及其遗传变异研究

江锡兵1,章平生1,杨 龙2,吴 强2,吴聪连2,吴小云2,龚榜初1,*,赖俊声2   

  1. 1中国林业科学研究院亚热带林业研究所,杭州 311400;2庆元县林业局,浙江庆元 323800
  • 出版日期:2019-11-25 发布日期:2019-11-25
  • 基金资助:
    中央级公益性科研院所基本科研业务费专项资金青年培育项目(CAFYBB2017QA005);浙江省农业新品种选育重大专项(2016C02056-6)

Genetic Variation of Leaf Phenotypic Traits in F1 Progeny of Interspecific Cross Between Castanea mollissima and C. henryi

JIANG Xibing1,ZHANG Pingsheng1,YANG Long2,WU Qiang2,WU Conglian2,WU Xiaoyun2,GONG Bangchu1,*,and LAI Junsheng2   

  1. 1Research Institute of Subtropical Forestry,Chinese Academy of Forestry,Hangzhou 311400,China;2Forestry Administration of Qingyuan County,Qingyuan,Zhejiang 323800,China
  • Online:2019-11-25 Published:2019-11-25

摘要: 采用性状离散特征描述、Pearson相关性分析以及类平均聚类分析等统计学方法,对板栗和锥栗种间杂交F1代183个单株叶片表型及其光合生理等18个性状的遗传变异规律进行研究。结果表明:18个性状的变异系数范围为6.51% ~ 32.92%,其中叶柄长度、气孔导度等11个性状变异系数均在20%以上,显示其在F1群体中存在广泛的遗传变异;183个F1代单株各性状值大多分布于双亲之间,且呈现出较好的连续性正态分布或偏态分布趋势;18个性状的中亲优势率为–33.97% ~ 19.64%,其中叶片长度等7个性状表现为正向中亲优势,其余11个性状中亲优势值为负值;分别有2个和6个性状表现为正向和负向超亲优势,而其余10个性状未表现出超亲优势;18个性状中分别有85对和8对相关性达到极显著水平(P < 0.01)和显著水平(P < 0.05);系统聚类将183个子代及其亲本在遗传距离2.33处划分为Ⅰ、Ⅱ、Ⅲ 3大类群,在遗传距离1.2处,第Ⅱ、第Ⅲ类群又各自被划分为2个亚群,聚类结果反映出各类群的性状特征。

关键词: 栗属植物, 种间杂交, 杂种优势, 遗传变异, 表型性状, 光合作用

Abstract: The genetic variation of 18 traits of leaf phenotype and photosynthetic physiology in F1 progeny(including 183 individuals)of interspecific cross between Castanea mollissima and C. henryi was studied by using the statistical methods of discrete character description,Pearson correlation analysis and cluster analysis. The results indicated:the variation coefficients of 18 traits for leaf phenotype and photosynthetic physiology in F1 generation ranged from 6.51% to 32.92%. The variation coefficients of 11 traits,such as petiole length and stomatal conductance,were all above 20%,which indicated that there were extensive genetic variations in F1 population. The values of leaf phenotypic traits and photosynthetic physiological characters of 183 individuals in F1 generations were mostly distributed between that of their parents,and showed a good trend of continuous normal or skewed distribution. The mid-parent heterosis rate of 18 traits ranged from–33.97% to 19.64%. Seven traits such as leaf length showed positive mid-parent heterosis,while the other 11 traits showed negative mid-parent heterosis. Further,two and six traits showed positive and negative over-parent heterosis respectively,while the other 10 traits did not show over-parent heterosis. For 153 pairs of correlations produced by 18 traits,there were 85 and 8 pairs of correlations reached extremely significant level(P < 0.01)and significant level(P < 0.05),respectively. The 183 offsprings and their parents were divided into three groups at genetic distance 2.33. At genetic distance 1.2,the second and third groups were divided into two subgroups respectively. The clustering results reflected the characteristics of each group,and the hybrid offspring could be selected more accurately according to the results of classification and target traits. The results provide important theoretical basis for early selection and breeding of chestnut hybrids.

Key words: Castanea, interspecific hybridization, heterosis, genetic variation, phenotypic trait, photosynthesis

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