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ThesisItem Open Access Genetics of yellow vein mosaic virus resistance, morphological and yield traits in okra (Abelmoschus esculentus (L.) Moench)(CCSHAU, 2018) Bharathkumar M V; Dahiya, M.S.A field experiment was carried out at at Research Farm of the Department of Vegetable Science, CCS Haryana Agricultural University by screening a set of okra breeding lines and varieties during Kharif 2015 under natural incidence of okra yellow vein mosaic virus (YVMV). Breeding lines HBT 12 and HB 1157 were found resistant against the disease while MR 41 and HBT 24 were most susceptible to YVMV. Crosses were made among these parental lines in resistant × susceptible fashion to develop four F1 hybrids namely, HBT 12 × MR 41, HBT 12 × HBT 24, HB 1157 × MR 41 and HB 1157 × HBT 24. These hybrids along with their respective parents were sown during spring-summer 2016 to produce the seeds of F2, back crosses (B1 and B2) and fresh seeds of parents and F1 for evaluation. Six generations (P1, P2, F1, F2, B1 and B2) of four crosses were sown during Kharif 2016 in Compact Family Block Design to evaluate them for YVMV resistance, morphological and yield contributing traits and thereby to study the genetic control of them in the parental line. The data collected from evaluation of six generations of four crosses were subjected to statistical analysis of correlation, path analysis and generation mean analysis. Study on association of traits revealed that selection for number of fruits, plant height, average fruit weight, fruit length and number of branches could improve the fruit yield per plant. Qualitative analysis for YVMV resistance using goodness of fit showed that the resistance to YVMV was governed by two complementary genes in HBT 12, while a single dominant gene controls the resistance in HB 1157. Fruit yield per plant was complex in gene action with most of the crosses expressing complementary gene action.