甘蓝型油菜核心种质根系性状变异及对产量的贡献  

Morphological variation of root traits in a rapeseed core collection and its effects on yield

作　　者：吴金锋[1] 高桂珍[1] 李锋[1] 陈碧云[1] 许鲲[1] 蔡梦鲜[1] 周梦妍 伍晓明[1] 

机构地区：[1]农业部油料作物生物学与遗传育种重点实验室,中国农业科学院油料作物研究所,湖北武汉430062

出　　处：《中国油料作物学报》2014年第6期741-747,共7页Chinese Journal of Oil Crop Sciences

基　　金：国家科技支撑项目(2013BAD01B0102);国家自然科学基金(31301360);国家国际科技合作专项(2012DFG90290)

摘　　要：为了探究甘蓝型油菜的根系形态和性状变异规律以及根系性状与产量之间的关系,以来源于世界各地的307份甘蓝型油菜核心种质为材料,首先进行了苗期根系形态分类,然后分别在苗期、花期和成熟期对根系性状(包括根和地上部的鲜重、主根长、根颈粗、以及一级侧根数)进行了调查与分析。结果表明,上述材料可分为A^H等8类有代表性的根系形态类型;3个生育时期的根系性状之间呈极显著或显著性相关,其中苗期根鲜重和花期根颈粗相关性最为显著,相关系数达到0.61。逐步回归分析表明,苗期、花期和成熟期的根系性状和地上部鲜重在3个生育时期中分别能解释8.7%、13.3%和3.9%的籽粒产量变异。To detect morphological variation of root traits of rapeseed （Brassica napus L. ） and to clarify the re- lationship between root traits and seed yield, a collection of 307 accessions of rapeseed core germplasm from all o- ver the world were used as materials. At seedling stage, rapeseed roots were classified into 8 types （type A to H） based on root morphological characterization. At seedling, flowering and mature stages, fresh root and shoot weight, taproot length, root crown diameter and primary lateral roots number were recorded. Significant correlations were found among these root traits. Correlation coefficient between seedling root fresh weight and root crown diame- ter at flowering stage was the highest at 0.61. Stepwise regression analysis suggested root traits and fresh shoot weight could explain 8.7%, 13.3% and 3.9% of seed yield variation at these 3 stages respectively.

关 键 词：甘蓝型油菜 根系类型 根系性状 籽粒产量 生育时期 

分 类 号：S565.403[农业科学—作物学]