摘要
甘薯品种与不同倍性(2x,3x,4x)野生种I.trifida杂交,获得F1代种子703粒,平均结实率为5.9%;甘薯品种与不同倍性种间杂种回交,结实率平均为15.4%。结果显示:野生种及多数种间杂种表现父本花粉育性障碍;种间杂交父母本染色体倍性愈趋近平衡,其结实率及种子可育率越高。通过双列杂交试验,筛选出甘薯品种“徐薯18”和“美国红”,种间杂种7K-1和7K-2为杂交亲和性较好的亲本;对177个野生种及其种间杂种后代材料进行了田间结薯性鉴定,种间杂交F1品系结薯率为11.4%,结薯品系间块根重性状呈广泛变异,单株薯块鲜重300g以上的占1.7%。从甘薯与二倍体野生种杂交后代中筛选出两个块根重较突出的四倍体杂种,对于甘薯育种资源的创新将具有重要意义。
Atotalof703trueseedswereharvestedwithameanseedsettingrateof59%whenI.trifidagermplasm(2x,3x,4x),therelativewildspecieswerecrossedwithsweetpotatocultivatedvarieties.Backcrosseswereconductedamonginterspecifichybridsandsweetpotatowithameanseedsettingrateof154%.Wildspeciesandmostoftheinterspecifichybridsshowedhighercrossabilityasfemaleparentsthanasmaleparentswhencrossedorbackcrossedwithsweetpotato.Whenthechromosomeploidyoffemaleparentandmaleparenttendedtowardbalance,theseedsettingrateandfertilitywerehigh.SweetpotatovarietiesXushu18andMeiguohongwereselectedbydiallelcrossaswellasinterspecifichybrids7K1and7K2whichhadbettercrosscompatibility.Tubersettingpropertyofprogeniesofinterspecifichybridwereinvestigated.ResultsshowedthattubersettingrateofF1hybridswere114%,buttuberweightofdifferentlinesweregreatlydifferent,and17%tubershadfreshweightbeyond300g.Twotetraploidhybridswithbettercharacterofbuberweightwhichwereselectedfromtheprogeniesofsweetpotatoanddiaploidwildspecieswereveryimportantforthecreationofsweetpota
出处
《江苏农业学报》
CSCD
北大核心
1999年第2期82-86,共5页
Jiangsu Journal of Agricultural Sciences
基金
国家"九五"甘薯育种攻关专题资助
关键词
甘薯
I.trifida
种间杂交
结实率
结薯性
sweetpotato
I.trifida
interspecificcross
seedsettingrate
tubersettingpropertytogermplasmresource.