บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Effects of poly (2-hydroxypropyldimethyammonium chloride) treatment on the postharvest longevity of cut roses in relation to stomatal behavior.

Hanafusa, M.; Doi, M.;

Acta Horticulturae Year: 2000 Issue: No. 518 Pages: 37-44 Ref: 24 ref.

2000

บทคัดย่อ

Effects of poly (2-hydroxypropyldimethyammonium chloride) treatment on the postharvest longevity of cut roses in relation to stomatal behavior.

Cut roses (cv. Rote Rose) were treated with 250 ppm poly (2-hydroxypropyldimethylammonium chloride) (PHPAC) for 12 h, then placed in deionized water, and held at 20 deg C under 12 h light (20 micro mol m-2 s-1). Stomatal conductance of the uppermost 5-leaflet leaves was measured in the middle of the light period. Stomatal conductance of leaves treated with PHPAC was lower than that of the control on day 1, but was higher after day 2 until the end of the experiment (day 8). To evaluate the influence of PHPAC under higher transpiration conditions, detached leaves were placed under higher light intensity (100 micro mol m-2 s-1). Stomatal conductance decreased during the first 3 days, but increased thereafter compared with that in the control. The effect of PHPAC on stomatal closure was examined by immersing fragments of Commelina communis leaves in PHPAC or abscisic acid (ABA) solutions at various concentrations for 3 h under light at 435 micro mol m-2 s-1. Stomatal aperture was observed microscopi

cally. PHPAC showed an ABA-like effect (i.e. stomatal closure), although the effect greatly depended on the concentration used. It si suggested that PHPAC controls the transpiration rate by closing stomata and thus prolongs the vase life of cut roses.