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Gynoecious cucumber lines are maintained by using
EXPLANATION
Hybrid Seed Production
- Induction of Staminate Flowers in Gynoecious Lines: Gynoecious cucumber lines (Cucumis sativus) produce only pistillate (female) flowers, preventing natural selfing.
- Maintenance: Foliar application of Silver Nitrate ($AgNO_3$) or Silver Thiosulfate (STS) acts as a potent inhibitor of ethylene action, inducing transient male (staminate) flowers that produce viable pollen for self-pollination. (Correct answer: Option 1)
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