Seed germination pre-treatments by fermentation, scarification, and use of GA3 and ascorbic acid in passion fruit (Passiflora edulis Sims. f. flavicarpa Deg.).
1994
Hardiyanto
Passion fruit (Passiflora edulis f. flavicarpa Deg.) can be classified as an orthodox seed due to its ability to germinate under low moisture content (5 to 9 percent), and prolonged storage. The application of HCl on passion fruit seeds showed consistently high mucilage breakdown index (5.67 to 6.67). Treatment of 10 percent HCl for 10 min was sufficient to remove the mucilagenous coating, and reduced the time for cleaning the seeds. However, the fermentation methods did not improve germination. Hand scarification using sandpaper gave significantly higher percentage germination (70 percent) and rate of germination (5.49). On the other hand, sulphuric acid, boiling water and ethyl alcohol showed significantly low germination percentage, which ranged from 2.00 to 3.33 percent. Gibberellic acid or ascorbic acid at various concentrations and soaking periods failed to penetrate unscarified seeds. However, these treatment combinations improved germination in scarified seeds. Use of GA3 and ascorbic acid at 50 ppm with 48 hours soaking promoted germination and seedling growth. Increasing concentration up to 200 ppm and soaking period (72 h) progressively reduced germination.
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