苜蓿根蘖性状遗传规律的研究  

A Study on Inheritance of Creeping-Rooted Character in Alfalfa

作　　者：高振生[1] 谢雪菊[1] 洪绂曾[1] 王培[1] 

机构地区：[1]中国农业大学草地研究所,北京100094

出　　处：《草业学报》1996年第4期41-47,共7页Acta Prataculturae Sinica

基　　金：高等学校博士点基金项目的资助

摘　　要：利用10年积累的两次调查的59个根蘖型苜蓿无性系资料,分析了根蘖性状的变异系数和广义遗传力。研究结果表明:在根蘖与非根蘖植株杂交F_1代群体中,亲本双方均为有根蘖习性的植株F_1代4年生植株发生根蘖的比率较高(64.2％～76.0％);亲本单方为根蘖植株的F_1代4年生植株根蘖发生率较低(10.7％～53.7％)。根蘖型苜蓿群体的根蘖植株枝条数及其伸展范围的变异幅度较大,距主根颈越远处其变异系数越高,40cm外的变异系数达110.4％～166.4％。苜蓿根蘖植株枝条数及其伸展范围的广义遗传力均较低,分别为20.7％～52.5％和34.9％～46.0％,距主根越远范围内根蘖植株枝条数的广义遗传力越低(20.7％),环境因素对根蘖性状的影响较大。The variability and the broad-sense heritability of the creeping-rooted character in alfalfa (Medicago media Pies. )were analysed in this study, based on the data accumulated through 1987-1995 on 59 clonal lines. It was observed that in the population of the 4-year-old F! hybrid progeny with both parents being creeping-rooted the percentage of creeping-rooted plants was as high as 64. 2%-76%, while the 4-year-old F1 hybrid progeny with a single parent creeping-rooted showed a lower proportion of creeping-rootedness of only 10. 7%-53. 7%. Among individual alfalfa plants the variation in the number of stems from creeping roots and in the extent of their expansion was significant, and it became larger with an increased distance from the crown of the main root:up to 110. 4%-166. 4% at a distance greater than 40 cm. A low degree of heritability was showed for alfalfa plants in relation to, respectively, the number of stems from creeping roots (20. 7%-52. 5%) and the extent of expansion (34. 9%-46%), and it also decreased with an increase in the distance from the crown of the main root of individual plants.The environmental factors had significant influence on the formation of creeping roots.

关 键 词：根蘖性状 遗传力 变异 苜蓿 

分 类 号：S551.703.2[农业科学—作物学]