Year: 1991
Type: article
Abstract: The response of chrysanthemum plants to varying R:FR ratios and phytochrome photoequilibrium values (Ø = P fr /P tot ) was evaluated by growing plants under 6%, or 40% CuSO 4 and water spectral filters. Using a narrow band-width (R = 655-665 and FR = 725-735 nm) and a broad bandwidth (R = 600-700 and FR = 700-800 nm) for R:FR calculation, 6% CUSO 4 filter transmitted light with greater R:FR (3.9) and grater Ø (0.81) than 40% CuSO 4 or water filters. Light transmitted through 40% CuSO 4 and water filters had a similar narrow band R:FR ratio (1.2), but the broad band R:FR ratio (2.1) of 40% CuSO 4 filter was higher than water filter. Estimated Ø value was similar for both water and 40% CuSO 4 filters. Final height of plants grown in CuSO 4 chambers was about 30% less than the plants in control chambers. The results suggest that broad band R:FR ratio correlated more closely to plant response than the narrow band R:FR ratio.
Source: HortScience
Authors: Nihal C. Rajapakse, John W. Kelly
Language: English
Topic: Light effects on plants
Subfield: Plant Science
Domain: Life Sciences
Open Access status: bronze
OpenAlex ID: W2508417597