作物灰色育种理论在杂交黑麦草新品系筛选中的应用  

Application of Crop Grey Breeding Theory in New Ryegrass Strain Screening

作　　者：陈奥[1] 龙明秀[1] 张维[1] 马文文[1] 

机构地区：[1]西北农林科技大学动物科技学院,陕西杨凌712100

出　　处：《草地学报》2012年第1期102-107,共6页Acta Agrestia Sinica

基　　金：国家科技支撑项目(2011BAD17B05);西北农林科技大学回国人员科研启动费(Z111020827);西北农林科技大学唐仲英育种基金(A212020901)资助

摘　　要：根据作物灰色育种学的理论和方法,对黑麦草(Loliumspp.)杂交F4代8个品系的单株产量、株高、分蘖数、有效分蘖率、茎粗、叶宽、叶长、茎叶比、生育期、初花期净光合作用速率进行目标性状灰色关联分析,并在此基础上,对黑麦草杂交F4代8个品系进行灰色多维综合评估。结果表明:黑麦草单株鲜重与分蘖数(r=0.7968)、茎粗(r=0.7472)、叶长(r=0.7116)关联度最高;茎叶比与有效分蘖率(r=0.7631)、株高(r=0.7468)关联度较高;而初花期净光合作用速率与叶宽(r=0.8431)和生育期(r=0.8264)关联最为密切。可根据育种目标,对与目标性状关联度较高的性状进行针对性选择。F4_5(卓越×百盛)、F4_6(多福×卓越)、F4_8(百盛×多福)3个杂交新品系综合性状最好,综合评估关联度分别为0.8582,0.7527和0.7340。Grey relational degree among 10 traits（fresh weight,plant height,tiller number,effective tiller ratio,stem diameter,blade length,blade breadth,stem-leaf ratio,growth period and net photosynthetic rate） of eight new ryegrass（Lolium spp.） F4 hybrid strains were analyzed using grey relational analysis.All strains were further evaluated and selected based on multidimensional comprehensive evaluation.Results showed that tiller number（r=0.7968）,stem diameter（r=0.7472） and the blade length（r=0.7116） had a higher grey relational degree with fresh weight.Stem-leaf ratio had higher relational degree with effective tiller ratio（r=0.7631） and height（r=0.7468）.Net photosynthetic rate had higher relational degree with blade width（r=0.8431） and growth period（r=0.8264）.Multidimensional comprehensive evaluation suggested that 3 new strains,F4_5（L.perenne ＇Eminent＇ ？？L.？？boucheanum ＇Bison＇）,F4_6（L.perenne ＇Tove＇ ？？L.perenne ＇Eminent＇） and F4_8（L.？？boucheanum ＇Bison＇ ？？L.perenne ＇Tove＇）,had better comprehensive properties than others and the grey comprehensive evaluation relational degree was 0.8647,0.7625 and 0.6932 respectively.

关 键 词：杂交品系筛选 作物灰色育种 目标性状灰色关联分析 灰色多维综合评估 黑麦草 

分 类 号：S33[农业科学—作物遗传育种]