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Heterosis and Inbreeding Depression in Sunflower.pdf
JournalofAgriculturalScienceandTechnologyB1(2011)138—145
Earliertitle:JournalofAgriculturalScienceandTechnology,ISSN 1939-1250
HeterosisandInbreedingDepressioninSunflower
c.SaetangandT.Machikowa
SchoolofCrop ProductionTechnology,InstituteofAgriculturalTechnoloyg,SuranareeUniversityofTechnology,Nakhon
Ratchasima30000.Thailand
Received:October25,2010/Published:May20,2011
Abstract:lnofrmationonheterosisandinbreedingdepressionforyieldandagronomiccharactersISessentiaIforsunflower(Helianthus
aHnuusL.)breedingprograms.Thisresearchwasconductedtoevaluateheterosisandinbreedingdepressionforyieldandagronomic
charactersofhybridsinvolvingeightsunflowerinbredlines.Theseinbredlineswerecrossedin8~8halfdialleltoobtain28Flhybrids.
The28hybrids ereself-pollinatedtoproducetheF2generation.The8parents,28Fihybridsand28F2populationswereevaluated
usingarandomizedcompleteblockdesignwiththreereplicationsattwolocationsinNakhonRatchasimafSUTFarm andNational
CornandSorghum ResearchCenter、in2009.Mid—parentheterosisandinbreedingdepressionwereestimatedofryield,headdiameter,
oilcontent,1,000-seedweightandplantheight.Significantdifferenceswerefoundamongtheparents,FIhybridsandF2populations
foralltraits.Flhybrid meansweresignificantly higherthan the parentalmeansofralltraits.In addition,Fihybridsshowed
considerableheterosisandheterobeltiosiswhencomparedwiththemid-parentandbetterparents,respectively.Yield,oilcontentand
plantheightshowedhighlypositiveheterosisinFlhybrids,rangingfrom 14.48to49.45%,8.88to33.22% and9.5ito29.25%,
respectively.Similarly,heterobeltiosiswerepositivesignificantofryield(19.22to49.04%),oilcontent(8.65to28.30%)andplant
height(2.83to27.61%).However,1,000-seedweightshowedalow levelofheterosisinFlhybrids(9·I36to8.07%),Meansofryield,
oilcontent.1.000-seedweightandplantheightinF2populationswerelowerthantheirrespectiveFihybrids.Inbreedingdepressionin
theF2populationswascomparativelyhighofryield,oilcontentandplantheight.Thecrossoflines5A ×2Agavethehighestheterosis
ofr
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