ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Prevention of phyochrome-related postharvest loss of quality in ornamentals through red light emitted by diodes.

Lieburg, M. J. van; Doorn, W. G. van; Gelder, H. van;

Acta Horticulturae Year: 1990 Issue: No. 272 Pages: 347-351 Ref: 10 ref.

1990

บทคัดย่อ

Cut flowering branches of Alstroemeria pelegrina cv. Yellow King were placed in distilled water and kept under 4 light regimes (30 s red/45 s dark, 30 s/45 s far-red, continuous red or continuous dark) for 9 days at 20 deg C. Total chlorophyll content of whole leaves was determined at the end of treatment. Hibiscus rosa-sinensis cv. Nairobi plants were kept under the same 4 light regimes for 4 days at 20 deg . At the end of the treatment bud abscission was recorded for 6 days at a light intensity of 136 micro mol m-2 s-1 for 12 h/day at 20 deg . Total chlorophyll content of Alstroemeria leaves in the red/dark (112.4 mg/100 g FW) and continuous red (117.2 mg/100 g FW) treatments was significantly higher than in the dark treatment (71.8 mg/100 g FW). The far-red treatment completely nullified the positive effect of the red treatment. The results suggest a role of phytochrome in the net breakdown of chlorophyll. The red/dark and continuous red treatments significantly reduced bud abscission in H. rosa-sinensis compared with the dark control (31.1% and 33.2% compared with 74.1%). Far-red light reversed the positive effect of red light and abscission was even higher than in the dark control (90.6%), suggesting the involvement of phytochrome. The use of light emitting diodes overcomes the problems due to heat build-up caused by fluorescent tubes and incandescent lamps.