BALAKRISHNA REDDY, M.VIJITHA, M.2018-05-262018-05-261997D5292http://krishikosh.egranth.ac.in/handle/1/5810047742Thefieldand 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.ennullThesis