狗牙根种质资源营养生长特性差异的研究  

Genetic variation of asexual reproduction characteristics of Cynodon dactylon

作　　者：王志勇[1,2] 刘建秀[2] 郭海林[2] 

机构地区：[1]南京农业大学园艺学院,江苏南京210095 [2]江苏省中国科学院植物所南京中山植物园,江苏南京210014

出　　处：《草业学报》2009年第2期25-32,共8页Acta Prataculturae Sinica

基　　金：国家自然基金项目(30571307);江苏省高技术项目(BG2006320)资助

摘　　要：本研究选取水平扩展系数、水平生长速率、垂直生长速率、单位周长匍匐茎数和最长匍匐茎长度5个指标，对不同地理分布的33份国内外野生狗牙根种源和源自中国、澳大利亚和美国的22份狗牙根品种之间的营养繁殖差异进行初步评定，以明确中国狗牙根种质的营养繁殖。结果表明，国内外狗牙根之间表现出丰富的多样性，变异系数在35．10％～82．31％，平均为57．26％，国内狗牙根种源之间差异较大，且国内种源变异范围大于国外狗牙根品种，国内狗牙根种源和育种材料的垂直生长速度明显低于国外品种；相关指标间除垂直生长速率外都存在着极显著相关性，相关系数最高达到0．957；通过SPSS13．0软件进行聚类，55份代表性狗牙根种源（品种）被分为3大类，即匍匐茎快速繁殖型、中间型和匍匐茎慢速繁殖型，其中，匍匐茎快速繁殖型均为中国本土种源。The study utilized 5 asexual reproductive traits （coefficient of expansion, level growth rate, vertical growth rate, the number of stolons per unit perimeter and the longest stolon） in order to make a preliminary assessment of genetic variation of asexual reproduction characteristics among the 33 different geographical distributions of wild Bermuda grass accessions from China and of 22 Bermuda grass cultivars from China, Australia, and the USA. There was a rich diversity in asexual reproduce of Bermuda grass from both China and over seas. The coefficient of variation was from 35.10%-82.31% （average 57.26%）, and that of domestic accessions was higher than that of overseas cultivars. Vertical growth rates of domestic accessions and breeding materials were significantly lower than those of overseas cultivars. There were significant correlations （maximal correlation coefficient of 0. 957） among asexual reproduction-related characteristics of Bermuda grass in both domestic and overseas cultivars with the exception of vertical growth rate. Based on five characteristics, SPSS 13.0 was used to divide Bermuda grass accessions into three asexual reproduction types： rapid propagation of stolons, intermediate and low-speed reproduction of stolons. The rapid propagation of stolons type are domestic accessions.

关 键 词：狗牙根 营养繁殖 遗传变异 聚类 相关分析 

分 类 号：S688.4[农业科学—观赏园艺]