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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