高粱的抗旱性比较与抗旱相关性状的QTL定位

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1、万方数据摘要高粱各种性状的抗旱系数相关的8个QTLs，分别定位在1、4、6、7染色体上。在第l染色体上12．8～21．0cM区段里检测到3个QTLs，联合贡献率为16．28％。第4染色体上125cM的位置检测出1个QTLs，LOD值4．10，可解释7．08％的表型变异。第6染色体上102．4eM的物理位置上定位到1个QTLs，LOD值3．43。第7染色体上102．3"-'105．9cM区段上检测到3个QTLs，联合贡献率为15．57％。关键词：高粱：抗旱性；遗传图谱；SNP：QTL定位万方数据AB

2、汀I认CTInvestigationofthevariationsofdroughtresistanceandidentificationofQTLsfordrought-relatedtraitsinsorghum(SorghumbicolorL．Moench)ABSTRACTSorghum(SorghumbicolorL．Moemh)，硒thefifthmostimportantcerealcropworldwide，isgrownforfood，feed，fiber,andbiofuels．

3、Asitsrelativelys呻legellomeslructure，highdegreeofhomologywithothercerealcropsandstrongmbmncetodifferentkindsofstresses，sorghumisbecominganexcellentmodeltounderstanddroughtresistamemechanismofcrops．Eventhoughmanystudieshavebeenconductedonsorghummorpholo

4、gy,physiological,QTLn,nppiI增andmolecularregulatorymechanismfordroughtresistame，nobreak—throughhasbeenmadesofarduetothecomplexityofthetrait．Inthisstudy,comparativeanalysisfordroughtresistanceanddrymatteraceumu-lationofgrainsorghumandsweetsorghumwascarr

5、iedoutthroughheadingstagewaterslressofthetwotypesofsorghum．QTLamlyseswerealsoperformed，basedontheanultra-high-qualitySNPrmpconstructedforarmpmgpopuhtionconsistingof244RILsdevelopedfromacrossbetweengrainsorghum654andsweetsorghumLTRl08，fordrought-relate

6、dtraits．Therminresultsareasfollows：1．SorghumgrainweightdroughtcoefficientWaSsignificantlypositivelyrehtedtodroughtcoefficientofmanyothertraits．Droughtcoefficieraofphntdryweightandgrainweightwassignificantlypositivecorrehtionatthe0．01level(bilateral)wi

7、thdroughtcoefficientoffreshweight．Onthewhole，thedroughtcoefficientofsweetsorghumtraitswashigherthangrainsorghum．2．ThesignificantlydifferentvariationwasdiscoveredbetweensweetsorghumIII万方数据ABSrRA(了andgainsorghumindrymatteraccumulation．Thestemrrloisturec

8、omentofsweetsorghumwashigherthangrainsorghumbynlol[ethan5％throughoutcropdurationexceptthebootingstage．Thestemdryweightratioofsweetsorghumwasgreaterthanthatofgrainsorghum．Itwasevidencedthatdoublesinkwasexistedingainandstalkofsweetsorghum．3．QTLs