COMBININGABILITY,GENE ACTION, HETEEROSIS AND SYNCHRONISATION STUDIES IN,SOME TOP RANK FORAGE BAJRA HYBRIDS
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Date
1997
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Professor Jayashankar Telangana State Agricultural University
Abstract
Thefieldand laboratoryinvestigationsrelatingto“CombiningAbility. GeneAction, I’Ieterosis And Synchronisation Studies In Some'I‘op Rank ForageBajraHybrids”wereundertakenduringWOO. The top crosses showed significant variability for green and dry fodder yieid,plantheightandnumberofleaves. . Incombiningabilityanalysis,theeffectsduetogcaofparentsandseaof hybridsweresignificantforgreenanddryfodderyields, plantheight,stemgirth andleaflength. ' Thecombiningabilityvariancesindicatedthepredominanceofnon-additive geneaction. I Highly significant but varying degrees ofheterosis was observed for the characters studied in respect ofheterobeltosisand standard heterosis. In these studies,8l—AXDRSB-l wasfoundtobethebesttopcrosshybridinrespectof meanperformanceaswellastheheterobeltosisandstandardheterosiswithregard togreen fodderand dry fodderyield. Theparentsofthiscrossvi7.., 8l-A and I DRSB-I were found to have highest significant gca effect for these traits. This crosshasalsorecordedhighestandsignificantseaellectfordryfodderyield, The phenotypic coefficient ofvariation were found to be higher than genotypic coefficient of variation for all the eight characters indicating the
.predominanceofenvironmentalelTectonthemlnheretabilitystudiesplantheight and number ot‘leaves have recorded a high genetic advance which revealed operationot‘additivegeneactionforthesecharacters. lncharacterassociationstudies,closeassociationol‘dryt'odderyieldwith numberol‘tillersandplantheightwithnumberol‘leaveswereobserved. Synelu‘onisationstudiesrevealedthatthefemaleparentwas floweringlate anditneedsstaggeredsowingsbyfourtotendaysdependingonthedaysto50“A. ‘ floweringofitsrespectivepollinators.Theminimumot‘fourdaysIstaggeredperiod wasnoticedinthecaseol‘8l-AXDRSB-l and8l-AX[)RSB—4. . Thedurationofdormancy rangedbetween two to sevenweeksinthe materialstudied.Amongthechemicaltreatmentsusedforbreakingthedormancy, GA3wasfoundtobesuperior. _ Theacceleratedageingstudiesrevealedthathybridshaveshownalesser deterioration comparedtotheparentallines.
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D5292