Summary
The biosynthesis of anthocyanin in tissue cultures and intact seedlings of Haplopappus gracilis is a light-dependent reaction which can be induced by blue light only. Anthocyanin appeared in all organs of the seedling.
Wounding of the plant led to an increase in the content of anthocyanin due to increased anthocyanin synthesis in the cotyledons.
The action spectra of anthocyanin formation in tissue cultures and intact seedlings have two peaks, one at 438 nm and the other at 372 nm. The limit of activity in the direction of longer wavelengths lies between 474 and 493 nm. Red light of short and long wavelength is ineffective in the induction of pigment synthesis. The photoreceptor of the light reaction is supposed to be a yellow pigment (flavoprotein or carotinoid). In contrast to the intact plants, isolated cotyledons and wounded seedlings are able to form anthocyanin not only in the blue region but also during irradiation with red light of high intensity. The action spectrum of anthocyanin synthesis in the isolated cotyledons has a marked maximum at about 440 nm and a second one at about 660 nm. A little activity can be observed throughout the visible spectrum. The pigment synthesis induced by red light can be completely suppressed by DCMU, an inhibitor of photosynthesis. This indicates that in the case of the activity in the red light caused by wounding chlorophyll serves as photoreceptor.
The anthocyanin synthesis in tissue cultures and seedlings could not be influenced by low energy radiation in the red or in the far red region, even after induction of anthocyanin synthesis by blue light of high intensity. Therefore it seems that the phytochrome system is not involved in anthocyanin synthesis in Haplopappus gracilis.
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Lackmann, I. Wirkungsspektren der Anthocyansynthese in Gewebekulturen und Keimlingen von Haplopappus gracilis . Planta 98, 258–269 (1971). https://doi.org/10.1007/BF00387070
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DOI: https://doi.org/10.1007/BF00387070