R. V. PATILMANOJ C. NAIK2019-06-212019-06-212007-08-31TH8830http://krishikosh.egranth.ac.in/handle/1/5810109456An investigation was undertaken in brinjal {Solarium melongena L.) to compare the single cross and double cross Fi hybrids, to assess the magnitude of variability in F2 generation, to know the extent of residual heterosis present in F2 and to isolate economic segregants for yield and yield attributing characters in segregating single and double cross F2 populations. The study on comparison of the SCFi and DCFis revealed that the crosses S.C.H.N.12 x S.C.H.N.15 and S.C.H.N.12 x S.C.H.N.16 were potential heterotic DCFis. The yielding capacity of S.C.H.N.12 x S.C.H.N.15 was 1.87 kg per plant (32.16 % CV) and it had 145.30% and 54.93% heterosis over commercial check and best SCFi respectively. The CV of DCFis range from 32.16 per cent to 50.86per cent for yield per plant, 13.68 to 17.09 per cent for fruit weight and 39.09 to 46.13% for no. of fruits per plant. The analysis of variability indicated DCF2 population had greater genetic variability over SCF2 for all characters as exhibited by higher values for mean, range, CV (%), PV, GV, PCV and GCV values. S.C.H.N.12 among SCF2 and R-I/12 x 15 (2- 16), R-I/12 X 15 (3-22) and R-1/16 x 18 (4-34) in DCF2 were potential segregating population with highest variability as indicated by higher PCV and GCV values. The residual heterosis in F2 range from 57.22 [R-I/12 x 17 (4-41)] to 71.51per cent (S.C.H.N. 18) in the population for yield per plant. All the DCF2 and S.C.H.N.12 had higher mean values for yield per plant as compared to CC and local check. Among DCF2, R-I/12 x 15 (2-16) and R-I/12 x 16 (2-18) and S.C.H.N.12 in SCF2 exhibited higher frequency of desirable economic segregants for yield per plant. The R-I/12 x 15 (2-16) (2-13 and R-I/ 16 x 18 (4-34) (3-22) were the selections made for further development into purelines after repeated selling.ennullThesis