บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Flower bud opening of cut “Nelson” carnations as affected by photosynthetic photon flux density

K. Fujiwara, Y. Tanaka, J.-S. Park and K. Kurata

Proceedings of 26th International Horticultural Congress. Volume of Abstract . Toronto, Canada, 11-17 August, 2002. Abstract S09-O-179. pp. 265.

2002

บทคัดย่อ

Flower Bud Opening of Cut 'Nelson' Carnations as Affected by Photosynthetic Photon Flux Density

For each flower bud opening (FBO) treatment, six bud-cut “Nelson” carnations were placed in a transparent cylindrical container (0.33 m in diameter , 0.50 m in hight; 25 C) ventilated at 300 L.H under a photosynthetic photon flux density (PPFD) of 30 (P30), 120(P120) or 250 (P250) mmol.m .s (at the bud-top level) with contrinuous light from white fluorescent lamps installed outside the container. The stem cut-ends of the carnations were placed individually in flower opening solution (FOS) containing 25 mg.L AgNO3 + 200 mg.L 8-hydroxyquinoline citrate (8-HQC) with 30 g.L sucrose (S30; combined with P30, P120 or P250) or without sucrose (SO; combined with P250). All the carnations in each treatment were removed from the container as 5 out of 6 buds opened fully, and were placed in a growth chamber 25 C) for 10 d flower-quality evaluation (FQE) with their stemcut-ends in deionized water. The required time for FBO was significantly reduced by increasing PPFD in the S30 treatments (60 h in P30-S30 (control), 48 h in P120-S30, 36 h in P250-S30). The time for FBO in P250-SO (120 h) was 2.0 to 3.3 times longer than that in the S30 treatments There was no large difference in flower quality among the S30 treatments during the 10 d FQE, whereas P250-SO was already lower in flower quality than in the S30 treatments at the beginning of the 10 d FQE. The results indicate that PPFDs of 120 and 250 mmol.m.s each combined with 30 g.L sucrose in FOS were effective for reducing the required time for FBO compared to the conrrol, and that 30 g.L sucrose in FOS cannot be eliminated for FBO treatment even when increasing PPFD from 30 to 250 mmol.m .s . Net CO exchange and absorbed sucrose during the FBO treatment were almost the same among the S30 treatments, suggesting that a certain amount of carbon uptake might be esential for full opening of bud-cut carnations regardless of the required time for FBO.