Guleria, S. K.Sawan Kumar2019-01-312019-01-312017-07-27http://krishikosh.egranth.ac.in/handle/1/5810093139The present investigation entitled ―Assessment of genetic potential of medium maturing inbred lines derived from different sources in maize (Zea mays L.)‖ had been undertaken to carry out combining ability analysis and assigning maize germplasm to various heterotic groups during kharif, 2016. Sixty crosses along with 32 parents were evaluated in RBD design during Kharif, 2016. Data was recorded on grain yield per plant and various morphological traits along with reaction to diseases. The line × tester analysis suggested that non additive gene effect was important for most of the traits. Line L28 (TNAU/CBE-83) was observed to be a good general combiner for grain yield, cob length, biological yield and protein content. Tester T1 (BAJIM-08-26) was found to be a good general combiner for 1000 grain weight, biological yield, protein content and tryptophan content whereas T2 (BAJIM-08-27) for grain yield, cob girth, harvest index, plant height, cob placement and days to 50 per cent silking. The maize germplasm was categorized in two different heterotic groups and fifteen lines were included in group A and fifteen in group B. However, eight lines viz., L5 (BAJIM-15-09), L6 (BAJIM-15-10), L9 (BML-6), L11 (CML-44), L13 (CML-269), L15 (CML-292) , L21 (CML-465-B-B) and L28 (TNAU/CBE-83) which showed positive GCA effects and positive SCA effects with T2 and negative SCA effects with T1 were considered more productive in the heterotic group A while the eight lines viz., L3 (BAJIM-13-02), L10 (BML-7), L12 (CML-141), L14 (CML-269-1), L16 (CML-294), L23 (HKI-1040-7), L24 (HKI-1105) and L26 (MRCQPM-16) which showed positive GCA effects and positive SCA effects with T1 (BAJIM-08-26) and negative SCA effects with T2 (BAJIM-08-27) were more productive in heterotic group B. Three cross combinations L28 × T2 (TNAU/CBE-83 × BAJIM-08-27), L15 × T2 (CML-292 × BAJIM-08-27) and L23 × T1 (HKI-1040-07 × BAJIM-08-26) were identified most promising on the basis of their per se performance, SCA effects and significant heterosis for different traits mainly for yield, earliness, and resistance to TLB, MLB and BLSB.ennullThesis