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Modifications of chloroplasts of flax cotyledons treated with monuron: myelinoid figures formed under low light conditions
Author(s) -
PALLETT K. E.,
DODGE A. D.
Publication year - 1980
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/1365-3040.ep11581486
Subject(s) - chloroplast , chlorophyll , darkness , ultrastructure , chemistry , biophysics , stroma , cytoplasm , carotenoid , membrane , chloroplast membrane , thylakoid , botany , biochemistry , biology , immunohistochemistry , gene , immunology
Abstract. Monuron treatment of flax cotyledons in the dark and at a low light intensity of 0.2 Wm −2 caused a retardation of chlorophyll breakdown. With low light, carotenoid breakdown occurred more rapidly, suggesting a possible overloading of the carotenoid protective system, but in darkness chlorophyll loss was first. The ultrastructure of treated leaves was markedly altered. In the dark, monuron caused a swelling of the chloroplasts and a subsequent disruption of the thyl‐akoids resulting in a concentric membrane formation in the stroma. Following envelope rupture the thylak‐oid system was visible as a myelinoid figure in the cytoplasm.