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Transpiration and stomatal conductance of roses cv. Sonia grown with supplemental lighting.

Slootweg, G.; Meeteren, U. van;

Acta Horticulturae Year: 1991 Issue: No. 298 Pages: 119-125 Ref: 1 ref.

1991

บทคัดย่อ

Transpiration and stomatal conductance of roses cv. Sonia grown with supplemental lighting.

Roses (cv. Sonia) were grown in winter in a greenhouse at 20 deg C day and 18 deg night temperatures, with supplemental lighting (20 h/day) (SL-flowers) or under natural light (NL-flowers). Cut roses were recut under water, stored in water for 3 h at 5 deg and then placed in vases with one stem/vase. Vase life experiments were carried out at 20 deg and 60% RH with either 12 h light/day or in total darkness. Transpiration rate and stomatal diffusive resistance to water vapour were measured for both greenhouse plants and cut flowers. Total leaf area and number of stomata were measured at the end of the experiment. The transpiration rate of SL-flowers was higher than that of NL-flowers in greenhouse plants and in cut flowers kept at both 12 h light/day and in total darkness. NL-plants showed a high diffusive resistance during the night, whilst stomata of SL-plants remained open during the 4 h dark period. Stomata of SL-flowers kept under 12 h light/day closed only partially during the dark period and when kept in total darkness remained open for more than 40 h. Stomata of NL-flowers were always fully closed in the dark. The number of stomata/area was the same for both SL- and NL-plants.