美洲黑杨杂种优良无性系扦插生根对比研究.PDF

中国农学通报 2016,32(4):9-13 Chinese Agricultural Science Bulletin 美洲黑杨杂种优良无性系扦插生根对比研究 黄国伟，陈慧玲，李振芳，彭 婵，马林江，张新叶 （湖北省林业科学研究院，武汉430075 ） 摘 要：为比较不同无性系及不同因素的扦插生根差异，以美洲黑杨杂交子代选出的17 个优良无性系及 2 个对照为试验材料，分基质、扦插部位、系号等不同因素进行扦插试验，对生根率、主根长、长须根根数 等指标数据进行分析。结果表明：水培扦插能诱导根系增长，但发育质量明显差于湿沙、珍珠岩等基质， 试验结束时水培根系均长在7 cm 左右，而湿沙扦插根系长约5 cm ，湿沙中基部穗条主根数约为水培中 部穗条的2 倍；无性系间因遗传差异，也表现出显著的生根差异，选出的优良系号生根能力基本都显著 高于对照NL895 和2025 杨，生根最好的I- 1000 的主根长和主根数分别为9.48 cm 和15.31 个，约是对照 NL895 的3 倍；扦插在基质中的穗条阶段性拔出调查再复原会显著引起根长和根数的减少。基部穗条 生根质量显著优于中部穗条，优良新品种培育和推广需选择适宜的扦插基质，生根能力强且优质的基部 穗条。 关键词：美洲黑杨；杂交苗；扦插；基质；生根 中图分类号：S72 文献标志码：A 论文编号：cas RootabilityComparativeAnalysisofCuttingsfromSuperiorHybridSeedlingsofPopulusdeltoides HuangGuowei,ChenHuiling,LiZhenfang,PengChan,MaLinjiang,ZhangXinye (HubeiAcademyofForestryScience,Wuhan430075) Abstract:Inordertocomparetherootingofdifferentclonesandunderdifferentfactors,astudyonrootability of 17 superior clones of Populus deltoides hybrid offspring and 2 contrast varieties was done based on comparingtheirdifferencesindifferentcuttingparts,differentsubstratesanddifferentclones,andanalyzedthe dataofrootingrate,rootlengthandthenumberoffibrousroots.Theresultsshowedthattherootoftheclones grewfasterinwaterculture,butthequalitywaspoorer than thatof theclonesinthewetsandandperlite matrix.Rootswereabout7cmlonginthewaterculture,andwereabout5cmlonginthewetsand,thenumber oftaprootsofbasecuttingsinthewetsandwastwice asmanyasthat inthewaterculture.Becauseofthe geneticdifferences,thereweresignificantdifferencesinrooting,therootingabilityofthosesuperiorcloneswas significantlyhigherthanthatofthecontrolNL895and2025,andtherootlengthandthetaprootsnumberofI- 1000,whichwasthebestone,were9.48cmand 15.31respectively,almostthreetimesoverthato