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PHOTOMORPHOGENIC RESPONSES TO UV RADIATION. II: A COMPARATIVE STUDY OF UV EFFECTS ON HYPOCOTYL ELONGATION IN A WILD‐TYPE AND AN aurea MUTANT OF TOMATO ( Lycopersicon esculentum Mill.)
Author(s) -
Lercari Bartolomeo,
Sodi Francesco
Publication year - 1992
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1992.tb02217.x
Subject(s) - lycopersicon , hypocotyl , etiolation , elongation , mutant , phytochrome , wild type , botany , biology , action spectrum , horticulture , biophysics , biochemistry , materials science , red light , gene , enzyme , metallurgy , ultimate tensile strength
Abstract— Hypocotyl growth in etiolated seedlings of wild‐type and an aurea mutant of tomato ( Lycopersicon esculenturn Mill.), that appears to be deficient in labile phytochrome, is strongly inhibited by UV radiation in the region of 300–400 nm. The role of phytochrome in the UV‐mediated inhibition of hypocotyl growth was studied using different experimental approaches: (1) by comparing the effectiveness of treatments of increasing duration of exposure to 692 nm and UV radiation; (2) by modifying the UV spectral range with specific cut‐off filters. The experimental results suggest that the UV‐induced inhibition of growth in wild‐type tomato is mediated to a large extent by the longer wavelengths of the UV‐A region and is mediated mainly by phytochrome. In contrast, at wavelengths < 305 nm a strong UV‐B effect was found in the aurea mutant, suggesting a preeminent action of a specific UV‐B absorbing photoreceptor that displays less action in the wild‐type.