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Effect of Light Intensity on Lip Color in Oncidesa Tariflor ‘Tainung No. 4 (Snow White)’
The flowers of <i>Oncidesa</i> Tariflor ‘Tainung No. 4 (Snow White)’ under different light intensities adjusted by sunshade net. From left to right: single net, double net and triple net. Bar = 1 cm.
The flowers of Oncidesa Tariflor ‘Tainung No. 4 (Snow White)’ under different light intensities adjusted by sunshade net. From left to right: single net, double net and triple net. Bar = 1 cm.

Author:Ching-Hui Chung*, Ting-Fang Hsieh, and Ting-En Dai

Abstract:

    This research was aimed at studying how the light intensity influences the lip color of Oncidesa Tariflor ‘Tainung No. 4 (Snow White)’. Plants were grown under three different shading levels (light intensities are 309.92, 191.88 and 69.23 μmol m-2 s-1, respectively) during flowering season, and their lip color and pigments contents were evaluated after flowering. Flowers that opened under higher light intensity had higher b* value, but L* and a* value were not affected by light intensity. The pigments contents included anthocyanin, flavonoid and carotenoid in lips of three treated flowers were analyzed. Data showed that only carotenoid content was decreased with decreasing light intensity. It was speculated that the yellow pigment of lip is carotenoid. The results pointed out that reducing light intensity could lower the carotenoid content of lip and whiten the floral color of ‘Snow White’.

Key words:Oncidium, Flower color, Light, Shading, Carotenoid

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Journal of
Taiwan Agricultural Research
Vol. 72, No.3 (2023) ISSN: 2790-086X Vol. 72, No.3 (2023)
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