Abstract
Effects of the red (R) to far-red (FR) photon ratio on bulb development in Allium wakegi were investigated. Field experiments were carried out in spring and summer, in which plants were covered with three kinds of acrylic resins : a normal clear one with a piece of white cheesecloth (control), one with low transmittance in a R region, and another with low transmittance in a FR region. The R/FR (660±5 nm/730±5 nm) photon flux density ratios in the control, R-intercepted, and FR-intercepted devices under natural light were 1.00, 0.53, and 1.73, respectively. In both experiments the FR-intercepted treatment inhibited an increase in bulb fresh weight, bulb dry matter percentage, and bulbing index (maximum diameter/neck diameter of a bulb). In the summer experiment, the plants in the FR-intercepted device did not initiate scaly leaves which were formed by all plants in the other treatments. These results show that bulb development of A. wakegi was inhibited under the high R/FR photon ratio. This effect was more obvious in the summer than in the spring experiments. Plants under low R/FR photon ratio produced bulbs similar to the control.
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