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Narrow-sense heritabilities and genetic correlations of ornamental quality traits of  Antirrhinum majus  (snapdragon) were evaluated with special reference to cut flower postharvest longevity (PHL). Inbreds P1 (16 days PHL) and P2 (3 days PHL) were hybridized to produce an F 1  (P1 × P2) that was self-pollinated to produce an F 2  population. The F 2  were self-pollinated to produce F 3  families and advanced through single-seed descent by self-pollination to the F 5  generation. P1, P2, F 1 , F 3 , F 4 , and F 5  were evaluated for ornamental quality traits. Quality traits were found to be quantitative and normally distributed. Narrow-sense heritability (h 2 ) estimates were high and consistent across generations examined; PHL h 2  ranged from 0.79 to 0.81 ± 0.06. Phenotypic and genotypic correlations revealed underlying physiological and pleiotropic interactions relevant to breeding programs aimed at simultaneous improvement of ornamental quality traits. PHL is inversely related to cut flower strength and days to flower, -0.44 ± 0.04 and -0.43 ± 0.44. Buds at discard is positively correlated to cut flower and plant diameter, cut flower weight and days to flower, 0.77 ± 0.05, 0.58 ± 0.06, 0.71 ± 0.06, and 0.77 ± 0.07, respectively. Gain from selection for quality traits of interest can be rapid.

Genetic Analysis of Advanced Populations in Antirrhinum majus L. with Special Reference to Cut Flower Postharvest Longevity