Influence of UV-light on carthamin accumulation and floret elongation in a cultivar of saffron thistle (Carthamus tinctorius L.) |
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Authors: | Akiyoshi Fukushima Koshi Saito |
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Institution: | (1) Biochemical Laboratory, Boyo High School Affiliated to Tokai University, 1531 Nouman, Ichihara, 290-0011 Chiba-Ken, Japan;(2) SPS-Institute, Biochemical Laboratory, Phyto-Dye Division, No. 13-1007, N-7, W-12, Chuo-Ku, 060-0007 Sapporo, Japan |
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Abstract: | Pre-matured florets of Benibana, a cultivar of saffron thistle (Carthamus tinctorius L.) was irradiated with UV-B (280–320 nm) or UV-C (254 nm) light for 48 h at 23±1 °C and the influence of UV-light on carthamin
accumulation and floret elongation was investigated. UV-C light enhances carthamin accumulation most prominently, showing
a specific value of 52.3 nmol carthamin·dm−3·h−1·25μm−2 (13.9 times of control), while it restricts floret elongation by a light-suppression manner (net elongation: 0.058 mm·h−1, one ninth of control). UV-B light is also promotive for the red colour appearance (25.0 nmol carthamin·dm−3·h−1·25 μm−2, 6.7 times of control) with suppressing floret elongation (net elongation: 0.17 mm·h−1, one third of control). Heterogeneous productivity of carthamin was seen in floret tissues after continuous treating under
UV-C light. Carthamin accumulation, heterogeneous carthamin productivity and decrease of floret elongation restraint under
UV-lights are discussed. |
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Keywords: | UV-light carthamin floret elongation Benibana saffron thistle (Carthamus tinctorius L ) |
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