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时间:2019-07-09
《杉木种子园无性系结实稳定性的遗传变异》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、维普资讯http://www.cqvip.com第28卷第1期南京林业大学学报(自然科学版)Vo1.28,No.12004年1月JournalofNanjingForestryUniversity(NaturalSciencesEdition)Jan.,2004杉木种子园无性系结实稳定性的遗传变异方乐金,施季森(1.黄山学院,安徽黄山245000;2.南京林业大学,江苏南京210037)摘要:在安徽西田林场杉木种子园对从福建洋口林场引进的25个无性系,每系固定6株样株,分系分株连续进行6a的结实量观测与分析。结果表明,杉木无性系结实相
2、对产量在年度、重复间稳定性较强,但结实量的年度方差分量较大,占总方差的36.72,而无性系仅占10.12,表明种子产量稳定性受气候、生物、环境、人为措施及无性系基因型等多种因素综合影响。同年度中,影响产量的主要因素则是无性系的基因型。以结实量的变异系数(c)或生态价系数两种方法评价无性系结实稳定性的结果基本一致,但应以多年的结实量与c或生态价系数综合判断,对无性系再选择均有较高的可靠性和实用性。按该法可把25个杉木无性系划分为高产稳定、中产稳定、低产稳定等9种结实类型。关键词:杉木无性系;结实稳定性;生态价;结实类型中图分类号:$72
3、2.8文献标识码:A文章编号:1000—200ca-(2004)O1—0017—04AStudyontheHeredityandVariationofSeedYieldingStabilityFANGLe—jin,SHIJi—sen。(1.HuangshanCollege,Huangshan245000,China;2.NanjingForestryUniversity,Nanjing210037,China)Abstract:Theseedyieldingstability(SYS)isoneofthemostimportantfa
4、ctorsaffectingseedproductioninhigh—generationseedorchardofChinesefir.Lotsoftheresearchesoncropva—rietystabilityhavebeendonewhileonlyfewofseedyieldingstabilityinforestwasreported.ExploringtheseedyieldingstabilityofChinesefirseedorchardprovidestheimportantbasisforre—selec
5、tingclonesinhigh—generationseedorchard.Thereare25clones,introducedfromYangkouTreeFarm,FuianProvince,inseedorchardofChinesefirinXitianTreeFarm,An—huiProvince,which6treeswereregardedassampleonesineveryclone,andseedyieldingquantityofthesetreeswasinspectedduringthe6yearscon
6、tinually.Basedontheinvestigateddata,theheredityandvariationofseedyieldingstabilityinChinesefirwerediscussedinthispaper.TheresultsshowedthattheenvironmentalfactorswerethekeyelementstOaffectseedyieldingstabilityofChinesefirorchardinthedifferentyears.whichmakeup36.72ofthet
7、otalvariancewhi1eChinesefirclonesonlyaccountfor10.12ofthetotalvariance.However,thekeyfactoraffectingseedyieldinChinesefirorchardwasclonegenotypeinthesamevear.Bymeansofthevariationcoefficientofseedyield(cv)orecovalencecoefficientofseedyieldingstability,the25clonesofChine
8、sefircouldbedividedintothreegroups,eg.High—stable,mid—stableandlow—stableandnineseedbearingtypes.Theresultsint
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