Haider, Z. A.Choudhary, Anuj Kumar2018-07-302018-07-302018http://krishikosh.egranth.ac.in/handle/1/5810062553EFFICIENCY OF SELECTION METHODS IN EARLY SEGREGATING GENERATION OF RICE (Oryza sativa L.) CROSSESThe experimental material consisted of three crosses viz; BG102/BPT5204, BG102/Naveen and BG102/Reshmi (Commercial Pvt. Hybrid Victory seeds) of rice (Oryza sativa L.), each of the crosses represented a separate experiment. These F2 selected plants were grown at rice experimental area, Birsa Agricultural University, Kanke, Ranchi, during kharif, 2014 in RBD with two replication and two methods of sowing such as direct seeded and transplanted at twenty days interval; each plot measuring 2.7 x 0.4 meter size. ANOVA revealed that mean sum of square due to progeny of crosses viz; Cross-I, Cross-II of F3 under different selection group followed by two dates of sowing for all most all traits were highly significant except for traits PH and GYP plot while in Cross-III, all characters were found highly significant except GPP in Ist date of TP under HY group indicating the presence of ample amount of genetic variability among progenies for all characters under study. Cross- I High h2 coupled with low genetic advance as per cent of mean had recorded for traits DFF in MTL as well as RPS group, which indicated the involvement of nonadditive gene action. For trait GPP recorded high h2 coupled with high GA as per cent of mean in Ist and 2nd date of DS under HY group whereas high GA along with moderate h2 was obtained in both date of sowing under same selection method indicating the preponderance of additive gene action. Average selection response for all the studied traits had exhibited maximum in LY followed by HY and RPS selection method. In early generation of selection based on the LY criteria as well as high realized h2 would be most effective. Cross- II Maximum standardized selection response was observed for all studied traits under HY selection method followed by LY selection method, RPS and MTL, while high magnitude of standardized selection differential was recorded under HY followed by RPS, LY and MTL selection method. High realized h2 was observed in different methods of sowing for all the characters under all methods of selection however as revealed by the table based on the HY selection method would be more effective. Cross- III F3 progenies exhibited high h2 coupled with high GA as per cent of mean for traits viz; TW, GYP plant and GYP plot in all selection method as well as both date of planting indicating the preponderance of additive gene action suggesting that selection may be effective for these characters in early generation. Suggesting that under normal TP condition in Ist and 2nd method of selection for HY and LY both traits TW and PH may be considered as an important trait for improving the yield potential of rice. Over all methods of selection viz; HY, LY, MTL and RPS for all the studied traits like PPP, GPP, TW and GYP except for DFF as well as PH indicated that based on these characters selection in F2 would be fruitful. Highest standardized selection response was obtained based on HY followed by RPS and MTL while high magnitude of standardized selection differential was recorded under HY selection method followed by RPS, MTL and LY for all most all the studied traits.en-USnullThesis