Effects of ultraviolet light elimination on pigmentation in Allium x wakegi and shallot (Allium cepa aggregatum group) bulbs
Arifin, N.S.; Miyajima, I.; Ozaki, Y.; Okubo, H.
Bulletin of the Institute of Tropical Agriculture, Kyushu University 25: 9-13
ISSN/ISBN: 0915-499X Accession: 003746497
The effects of ultraviolet (UV) light elimination on the flavonoid content of the bulbs of Allium wakegi and shallots (A. cepa var. aggregatum) were investigated. The mean anthocyanin content was about 16% less under UV cut-off films, eliminating <360 and <390 nm of the sunlight than under the film transmitting UV light (control). Changes in the anthocyanin content by UV light elimination were accession-dependent. Flavonols were relatively more stable than anthocyanins under the UV cut-off films and did not statistically show any difference between the treatments. The change of anthocyanin content under UV cut-off film did not definitely follow the change of flavonol content. UV light-eliminating treatment of leaves reduced the anthocyanin content in the bulbs which were not directly exposed to the light.