Chakraborty, ManigopaIzhar, Tajwar2017-06-272017-06-272012http://krishikosh.egranth.ac.in/handle/1/5810023433GENETIC EVALUATION OF HYBRIDS FOR BABY CORN, GREEN EAR, YIELD AND QUALITY OF MAIZE (Zea mays L.)Twelve inbred lines and five testers were utilized in making sixty crosses in a line × tester analysis for evaluation of maize hybrids with regard to baby corn, green ear and yield parameters along with their quality attributes. The parental lines along with their standard checks were evaluated in three different experiments viz., normal maize hybrid trial, baby corn trial and green ear trial. These sixty hybrids and seventeen inbreds along with three checks in both normal maize hybrid trial and green ear trial while two checks in baby corn trial were evaluated in a randomized block design in two environments in kharif 2010 and rabi 2010-11. The crop was evaluated for grain yield and green ear traits in one experiment and for baby corn in other experiment separately in the neighbouring plots in the same season and were managed in similar way for both environment-1 and environment-2. Observations were recorded for twenty three characters in normal maize hybrids, twenty one characters in baby corn and fourteen characters in green ear over three replications. The mean observations data were used for analysis of variance, combining ability analysis through L×T mating design over environments and heterosis estimation. Eighteen, fourteen and seven quantitative characters were studied for normal maize hybrids, baby corn and green ear trials respectively in two different environments while four qualitative characters and one disease parameter for BLSB and seven qualitative characters for both baby corn and green ear were studied in single environment. Pooled analysis of variance revealed significant differences among the genotypes for all the characters in all the three experiments. Genotype × environment interactions were also found significant for all the characters under study. For qualitative characters and disease reaction, the parental lines and their F1s were also found significant for all the characters. The estimated variance components of combining ability analysis revealed that the magnitude of sca variance was higher than that of gca variance for all the characters studied which indicated the predominant role of dominance gene action. The parental lines, BQPM-2 and BQPM-4 showed highly significant positive gca effect for yield characters in environment-1, environment-2 and pooled for baby corn, green ear and grain yield characters. In case of testers, BAUIM-2 for both grain yield and green ear traits while CM 150 for baby corn exhibited highly significant positive gca effect for yield characters in environment-1, environment-2 and pooled. The cross, BAUIM-4×HKI-163 for both grain yield and green ear while the cross BAUIM- 1×BAUIM-2 for baby corn revealed highly significant positive sca effect for yield characters in environment-1, environment-2 as well as pooled. The cross, BQPM-2×BAUIM-2 for grain yield and baby corn while the crosses, BQPM-2×HKI 193-1 and CML 161×BAUIM-2 for green ear expressed maximum positive heterosis over all the checks for yield characters. The crosses, BAUIM-3×BAUIM-2, BAUIM-1×BAUIM-2 and BQPM-2×BAUIM-2 were found to be significantly superior to the check HQPM-1 for disease scoring against BLSB in normal maize hybrids. The crosses, BQPM-2×BAUIM-2, BQPM-4×K-1105 and BAUIM-4×HKI-163 exhibited best quality parameters for all the traits observed in the present study like, protein content, typtophan content, lysine content and starch content in normal maize hybrids while moisture content, calcium content, iron content, phosphorus content, sugar content, crude fibre content and dry ash content in baby corn and green ear.en-USnullThesis