亲本籼粳成分与两系杂交粳稻杂种优势的关系及遗传基础

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1、作物学报ACTAAGRONOMICASINICA2016,42(5):648657http://zwxb.chinacrops.org/ISSN0496-3490;CODENTSHPA9E-mail:xbzw@chinajournal.net.cnDOI:10.3724/SP.J.1006.2016.00648亲本籼粳成分与两系杂交粳稻杂种优势的关系及遗传基础1,211122,*于亚辉刘郁李振宇陈广红徐正进唐亮12毛艇徐海12辽宁省盐碱地利用研究所,辽宁盘锦124010;沈阳农业大学水稻研究所,辽宁沈阳110866摘要:以籼粳重组自交系(秋光×七山占,RIL

2、)和粳型光温敏核不育系(GB028S)及其杂交F1为材料,利用程氏指数法和分子标记法分析亲本的籼粳成分与杂种优势的关系及遗传基础。结果表明,采用程氏指数法和分子标记法在群体籼粳分类的结果上比较一致;RIL偏粳系数与F1产量及其杂种优势均呈显著或极显著的二次曲线关系;F1产量在偏粳系数0.55~0.70区间内出现高峰值,杂种优势在偏粳系数0.50~0.65区间内出现高峰值,即RIL偏粳系数为0.55~0.65时F1有形成较高产量及杂种优势的潜力。Chr.8、Chr.11和Chr.12的籼粳成分与F1产量及杂种优势关系密切,双亲的遗传距离与F1产量和相关性状及杂种

3、优势没有明显的关系。关键词:重组自交系;两系杂交粳稻;杂种优势;籼粳成分RelationshipbetweenIndica-JaponicaIndexofParentsandHeterosisofHy-bridandItsGeneticBasisinJaponicaTwoLineHybridRice1,211122,*1YUYa-Hui,LIUYu,LIZhen-Yu,CHENGuang-Hong,XUZheng-Jin,TANGLiang,MAOTing,and2XUHai12LiaoningInstituteofSaline-AlkaliLandUtili

4、zation,Panjin124010,China;RiceResearchInstitute,ShenyangAgriculturalUniversity,Shenyang110866,ChinaAbstract:InordertofurtherrevealtherelationshipbetweencompositionofsubspecieslineageandheterosisinOryzasativaL.,webuiltabridgeformorphologicalindex,Cheng’sindex(Chi)andmolecularindex,ja

5、ponicadiscriminationvalues(Dj)basedontwopopulations,arecombinantinbredlines(RILs),derivedfromthecrossbetweenindicacultivarQishanzhanandjaponicacul-tivarAkihikari,andjaponicaphoto-thermosensitivegenicmalesterile(PTGMS)lineGB028SandtheirF1hybrids.Twoindexsachievedrelativelyconsistentr

6、esultsintwopopulationsindependently.SignificantcurvilinearrelationshipappearedamongDjvalues,F1yieldandyieldheterosis.ThepeaksofF1yieldandyieldheterosisweredetectedinDjintervalfrom0.55to0.70andfrom0.50to0.65respectively,indicatingthat0.55−0.65isthepreferentialDjintervalforproducinghi

7、ghyieldandheterosisofF1hybrids.CompositionsofsubspecieslineageonChr.8,Chr.11,andChr.12werecloselyrelatedwithyieldandheterosisofF1,however,therelationshipamongparent’sgeneticdistance,F1yieldandheterosiswasnotsignificant.Keywords:RIL;Two-linehybridrice;Heterosis;Indica-japonicacomposi

8、tion自1908年Shull提出“杂