Abstract
Sunflower plants (Helianthus annuus L. cv. Russian Mammoth) were grown in two growth cabinets under natural light. One of the cabinets had windows with special glass which intercepted the radiation beyond 700 nm, and the other had windows with normal glass. The R (red) /FR (far-red) (600-700 nm/700-800 nm) photon flux ratio in the two cabinets were 2.6 and 1.2, respectively.
The stem length and plant height under the special glass were significantly shorter than those under normal glass. From this fact, it can be concluded that the R/FR ratio changed and plants became dwarfed by the interception of far-red irradiation. This special glass can be applied to the materials used in greenhouses for transplant production to avoid elongation in producing seedlings. It also can help in the maintenance, harvesting and other work involving trees in fruit greenhouses by making the trees dwarves.
