Heterosis for yield and quality traits and resistance to purple blotch in onion
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Heterosis, purple blotch disease, hybrids, yield.Issue
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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.Abstract
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