Effect of coumarin and xanthotoxin on mitochondrial structure, oxygen uptake, and succinate dehydrogenase activity in onion root cells

At concentrations in which they occur on the plant surface and retard mitosis, coumarin and xanthotoxin lowered uptake of oxygen (by 60 and 30%, respectively) by meristematic cells of Allium cepa root tips. They caused changes in the structure of the mitochondrial matrix to become dense, and protrus...

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Bibliographic Details
Published in:Journal of chemical ecology 1994-10, Vol.20 (10), p.2471-2480
Main Authors: Kupidlowska, E. (Warsaw University, Warszawa, Poland.), Dobrzynska, K, Parys, E, Zobel, A.M
Format: Article
Language:English
Subjects:
ACTIVIDAD ENZIMATICA
ACTIVITE ENZYMATIQUE
Agronomy. Soil science and plant productions
ALELOQUIMICOS
ALLIUM CEPA
Animal and plant ecology
Animal, plant and microbial ecology
Biochemistry
Biochemistry and biology
Biological and medical sciences
Chemical, physicochemical, biochemical and biological properties
COUMARINE
CUMARINAS
Demecology
Fundamental and applied biological sciences. Psychology
MERISTEMAS APICALES
MERISTEME APICAL
MITOCHONDRIE
MITOCONDRIA
Physics, chemistry, biochemistry and biology of agricultural and forest soils
Plants and fungi
RACINE
RAICES
Soil science
SUBSTANCE ALLELOCHIMIQUE
SUCCINATE DESHYDROGENASE
SUCCINATO DESHIDROGENASA
TOXINAS
TOXINE
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Summary:At concentrations in which they occur on the plant surface and retard mitosis, coumarin and xanthotoxin lowered uptake of oxygen (by 60 and 30%, respectively) by meristematic cells of Allium cepa root tips. They caused changes in the structure of the mitochondrial matrix to become dense, and protrusions of mitochondrial membranes were visible paralleling their hypertrophy, indicating alteration in the structure and physiology of these organelles. Coumarin and, to a lesser extent, xanthotoxin increased succinate dehydrogenase production in mitochondria and also in the cytoplasm, indicating changes in membrane permeability. Changes in oxygen uptake and mitochondrial structure, in addition to the retardation of mitosis, may be the reason these compounds act as allelochemicals after they have been removed from the plant surface and reach the root meristem
ISSN:0098-0331
1573-1561
DOI:10.1007/BF02036184