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ThesisItem Open Access Identification of quantitative traits loci (QTLs) for popping traits and kernel size in maize(Punjab Agricultural University, Ludhiana, 2020) Sukhdeep Kaur; Rakshit, SujayPopping traits play an important role in the utilization of popcorn. In this study, the F8 RILs population derived from HKI PC4B (Popcorn) Ć CML 269 (Normal corn) was characterized for seed and popping traits, and sufficient genetic variability was observed in the RILs and the parents for target traits. The best performing RIL(s) in specific environments like RL4, RL51, RL73 were identified using AMMI analysis. A few RILs were found to be superior to those of parents representing their possible use in popcorn breeding. QTL mapping (CIM algorithms) identified a total of 15 QTLs. Out of these QTLs, five QTLs for traits TW, PEV, PPand FV were mapped consistently across the environments on chr 3, 5, 6 and 9, respectively (R2 16.60 ā 29.50 %). A total of 10 QTLs identified were environment specific. Two QTLs each for TW, PEV, PP; one QTL for FV were reported on chr 1, 2, 4, 7and 8, respectively. Based on the average values of the traits, three more QTLs were identified for PP, FV and PEV on chr 3 and 1 (R2 4.71 ā 11.06 %). MetaQTL approach integrated QTLs from the earlier studies using BioMercator v4.2. A total of 10 metaQTLs were identified and 229 genes were shortlisted in these regions on expression basis (nineteen genes selected using KEGG pathways). The four metaQTLs were considered important for popping traits having 5-8 QTLs clustered in regions. The QTLs for PEV (two) and seven metaQTLs for traits PP, TW, PEV, FS were observed at chr 1, earlier also QTLs and metaQTLs were reported on chr 1. Therefore considered as an important region in enhancement of popping traits
