“冰淇淋”彩色甘薯杂交新品种的选育

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Abstract：Thisstudyaimstoimprovetheefcienthybridbreedingsystemforcoloredsweetpotatoesandbreed"icecream"sweet potatovarietisitgeneticsabilityigyels，andgqualityDirectedhrdizationwascardutwitteoloedstotato varietyPurpleLeafcarring the purple genes IbMYB1-3asthe female parentand'Xiangsu99' with favorable cross-ompatibility as the maleparent.From517hybrid plants，104lines withfleshcolorbeing purple mixedwithothercolors wereselected.Further， twoexceptionalnewvaretis，namedXiangfeiNo.1'andXiangeiNo.2'，weresucefullybredfromtheselies.Withasa Yidianhong'astheontrol，arietyomparisontrials，ulti-sitetrails，andproductiontralswerecarredouttoompreeively evaluatetheyields，qualityanddiseaseresistanceof thetwonewvarieties.TheresultsrevealedthatXiangfeiNo.1'andXiangfei No.2'had the fresh tuberyieldsof 27590.4kg/hm2 and 30 269.5kg/hm2 ，respectively，whichwere 38.7% and 52.2% higher than that ofNanshaYidianhong'Thequalityanalysis indicatedthattheanthocyanicontentin'XiangfeiNo.1'and'XiangfeiNo.2'was 4.77 （20 mg/100g and 15.39mg/100g ，respectively. After cooking， the tubers tasted glutinous and sweet， with a fine texture， a chestnut aroma， andlowcrudefbercontent.ThesensoryscoresofXiangfeiNo.1'andXiangfeiNo.2'increasedby155and175potssptiely comparedwiththatofthecontrol.Bothvarietiesshowedmoderateresstancetosweetpotatobacterialwiltandresistancetoblack spotbutweresuseptibletorootrot，stemrotandscab.Inconclusion，thedirectedhybridizationbasedonIMYB1-3canectively improvethevarietiesofcoloredsweetpotatoes.Thenewlybredvarieties'XiangfeiNo.1'andXiangfeiNo.2'demonstratebothhigh yieldsandhighquality.Thisstudyprovidesnewgermplasmmaterialsandatechnicalrouteforthebredingofoloredsweepotatoes. Key words：colored sweet potato; purple gene; IbMYB1-3; crossbreeding; targeted improvement of variety

中国是世界上甘薯种植面积最大且总产量最高的国家，也是甘薯的主要消费国。（剩余8075字）