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Influence of ethanol on alternative oxidase in mitochondria from callus‐forming potato tuber discs
Author(s) -
PLAS LINUS H. W.,
WAGNER MARIJKE J.
Publication year - 1980
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1980.tb02639.x
Subject(s) - alternative oxidase , respiration , antimycin a , mitochondrion , cytochrome c oxidase , callus , cellular respiration , electron transport chain , biochemistry , chemistry , oxidase test , biology , botany , enzyme
Ethanol, when added to the incubation medium of callus‐forming potato tuber discs, inhibits callus growth and causes an increase of the mitochondrial antimycin‐A resistant respiration, expressed as a percentage of state III‐respiration. This increase in resistance to antimycin‐A is the result of a poor development of the cytochrome pathway in tissue discs treated with ethanol. The development of the antimycin‐A resistant alternative oxidase sensitive to chelator is about the same for treated and untreated discs. The respiratory control (RC) ratio of the mitochondrial respiration increases after addition of a chelator, which inhibits the alternative pathway. The RC ratio of the uninhibited mitochondrial respiration appears to be inversely related to the capacity of the alternative pathway, when mitochondrial preparations with different capacities to transfer electrons via the alternative path are compared. From the experimentally observed relation between RC‐ratio and alternative oxidase capacity, it was concluded that at least half of the capacity of the alternative path is used in uninhibited state IV respiration.