Heterosis for yield and quality traits and resistance to purple blotch in onion
Gowda, R Veere | , Ambresh
The study was carried out to estimate magnitude of heterosis for bulb yield and its attributing traits in 28 crosses resulting from a Line × Tester mating design of 4 male sterile lines and 7 testers in onion. Among the 28 crosses, L₂ × T₄ was highly heterotic for purple blotch disease resistant (−42.62), plant height (7.25), neck thickness (−6.67), ten bulb weight (6.75), polar diameter (6.77), equatorial diameter (7.28), marketable bulb yield (25.95), number of rings per bulb (22.16) and per cent of sprout bulbs (−30.85) over commercial check. While the cross L₃ × T₅ exhibited significant heterosis over standard check for days to maturity (−6.67), neck thickness (−15.56), polar diameter (3.84), equatorial diameter (3.99), marketable bulb yield (28.65), rotten bulb (−25.22), number of centers per bulb (−4.55) and number of rings per bulb (6.23). Hence, these two crosses, viz., L₂× T₄ and L₃ × T₅ can be exploited commercial cultivation.
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