VASUNDHARA, M.MANJUNATHA SWAMY, T. S.2017-06-192017-06-192008-06-15Th-9220http://krishikosh.egranth.ac.in/handle/1/5810021683A Multilocation trial was carried out at Bangalore, Mandya and Shimoga with 11 mutant genotypes of Coleus forskohlii (Wild) Briq to evaluate superior mutants and somaclones suitable for different locations, over the seasons and to screen against bacterial wilt and root knot nematode caused by Ralstonia solanacearum and Meloidogyne incognita respectively during 2005-2007. Significantly maximum plant height (71.63 cm) and number of branches (48.23) were recorded in MV7 mutant, which was superior over all other mutants. Maximum number of leaves (911.30) and leaf area per plant (10119.05 cm2) were recorded in MV3 and MV4 mutant respectively. The mutant MV5 has recorded maximum number of tuberous root (18.87) and tuberous root diameter (2.93 cm), MV7 has recorded maximum tuberous root length (29.17 cm), fresh tuberous root weight (666.81 g) and dry tuberous root weight (177.94 g). However, least number of roots recorded in MV9 (11.18), Minimum tuberous root length in MV1(19.84 cm), tuberous root diameter (2.00 cm) in MV8, fresh tuberous root weight (321.18 g) in K-8 and dry tuberous root weight (90.50 g) in SV2 mutant. Maximum forskolin content was produced by MV7 (0.76%) followed by MV8 (0.74%), MV6 (0.72), MV2 and MV3 (0.71%) and minimum was produced by MV9 (0.65%). Among different location tried, Bangalore location was found more favourable followed by Shimoga and mandya location for growth, yield and quality parameters. Based on stability parameter, MV7 exhibited high mean value with regression co-efficient value almost equal to unity for yield and quality parameter indicating stable and uniform performance in all locations. The mutants MV5 and MV6 showed moderate resistance reaction, while mutants, MV2, MV3, MV7, MV8, MV9, SV1 and SV2 showed moderately susceptible reaction and MV1, MV4 and K-8 showed susceptibility reaction to bacterial wilt caused by Ralstonia solanacearum. The mutants MV7 and MV3 showed moderate resistance reaction to root – knot nematode (Meloidogyne incognita), while the remaining mutants were found to be susceptible.ennullThesis