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EFFECT OF BLUE/UV LIGHT ON ANTHOCYANIN SYNTHESIS IN TOMATO SEEDLINGS IN THE ABSENCE OF BULK CAROTENOIDS

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Abstract

Abstract Anthocyanin synthesis in the hypocotyl of tomato (Lycopersicon esculentum) seedlings responds strongly and specifically to blue/UV light while the response to red and far-red light, operating through phytochrome, is weak. The herbicide Norflurazon (SAN 9789) was used to inhibit synthesis of colored carotenoids almost completely without affecting growth and development measurably. Even though carotenoid content was reduced to less than 2% of normal and the fluence rate response function for blue and UV light was linear within the experimental range, Norflurazon treatment did not reduce seedling sensitivity toward blue/UV light. It was concluded that at least‘bulk’carotenoids are not the photoreceptor chromophore of the blue/UV photoreceptor pigment.

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