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- W2000792675 abstract "Homogenates of Phaseolus vulgaris cotyledons have been found capable of hydrolyzing acetylthiocholine. The hydrolysis occurs optimally at pH 8.0, and is inhibited by neostigmine but not eserine. Total activity of the enzyme increases about three-fold between the second and third days of germination, and remains high until day 6 before dropping coincident with the appearance of visible morphological symptoms of senescence in the tissue. Fractionation studies have revealed that the enzyme is enriched in preparations of purified cell wall and plasma membrane and is also present in a soluble fraction. The soluble enzyme accounts for more than 70% of the total cholinesterase activity two days after planting but by the fourth day of germination only about 30% of the total activity in the tissue is soluble. During the same period there is a large increase in the specific activities of both the cell wall and plasma membrane enzymes. By the seventh day of germination the particulate and soluble forms of the enzyme both show much reduced activities, but the specific activities of the cell wall and plasma membrane enzymes subsequently increase again. This is thought to reflect breakdown of protein other than cholinesterase in these structures as they in turn become subject to the increasing pressures of senescence. Cholinesterase in plant tissue presumably serves to regulate the endogenous titre of acetylcholine. The behaviour of this enzyme in bean cotyledons has been interpreted in terms of patterns of physiological and ultrastructural change known to characterize this tissue during germination." @default.
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- W2000792675 date "1975-07-01" @default.
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- W2000792675 title "The Effects of Germination on the Subcellular Distribution of Cholinesterase in Cotyledons of Phaseolus vulgaris" @default.
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- W2000792675 doi "https://doi.org/10.1111/j.1399-3054.1975.tb03827.x" @default.
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