玉米重金属铅(Pb^(2+))含量的配合力分析与育种对策  

Combining Ability Analysis for Pb^(2+) Content in Maize and the Corresponding Breeding Strategy

作　　者：赵雄伟[1] 金枫 曹艳花[1] 李芦江[1] 张永中[1] 张志明[1] 沈亚欧[1] 潘光堂[1] 林海建[1] 

机构地区：[1]四川农业大学玉米研究所,成都611130 [2]贵州省兴义市环保局,兴义562400

出　　处：《植物遗传资源学报》2015年第1期29-36,共8页Journal of Plant Genetic Resources

基　　金：国家自然科学基金(31201221)

摘　　要：选择有代表性的12个玉米自交系,按Griffing4模式组配获得66个组合(F1),用温室盆栽,在3个Pb2+污染水平下对叶片和子粒Pb2+含量配合力和遗传参数进行分析。结果表明:玉米叶片和子粒的Pb2+含量一般配合力与特殊配合力差异均达到显著水平,非加性方差大于加性方差,遗传方差大于环境方差,广义遗传率大于狭义遗传率,该性状的变异主要来自遗传因素,遗传力较强。玉米种质筛选过程中,土壤Pb2+浓度在333.32 mg/kg以下,用亲本郑58组配的组合在筛选时不仅注重子粒Pb2+含量未超标而且要注重叶片Pb2+高富集,其主要是兼顾饲料和粮食安全的同时进行土壤Pb2+污染的生物修复;土壤Pb2+浓度高于715.46 mg/kg时,用亲本178组配的组合筛选应注意叶片和子粒低Pb2+积累的种质选育,对今后在不同Pb2+污染土壤中开展玉米品种筛选和规避污染育种策略的选择具有一定的指导意义。66 hybrids（ F1 ）were got by crossing 12 selected typical inbred lines according to Griffing 4 model. The analysis of combining ability and genetic parameters were conducted for Pb^2＋ contents in leaves and kernels un- der 3 Pb^2＋ contamination levels via pot cultivating method in the greenhouse. According to the results, there were significant differences between general combining ability and special combining ability of Pb^2＋content in maize leaves and kernels, and the non-additive variance was larger than the environmental variance, as well as the tability,indicating that this trait＇s variance is mainly the germplasm screening process, when the soil Pb^2＋ larger than the additive variances. The genetic variance was broad-sense heritability was larger than the narrow-sense heri- from genetic factors with a higher hereditary capacity. During concentration was lower than 333.32 mg/kg, Using combina- tions crossed by parent strain Zheng58 would focus on not only the Pb^2＋ content of kernels in standard,but also the high enrichment of Pb^2＋ content in leaves,the main purpose was to conduct bioremediation for Pb^2＋ contamination in soil while taking feed and food security into account. When the Pb^2＋ concentration was higher than 715.46 mg/kg,using combinations crossed by parent strain 178 should focus on selecting germplasm of low Pb^2＋ accumulation in leaves and kernels, and this would offer some certain guidance for screening maize varieties in Pb^2＋ contaminated soil in the future and selecting breeding strategy of avoiding pollution.

关 键 词：玉米 Pb2+胁迫 配合力 育种策略 

分 类 号：S513[农业科学—作物学]