Compartmentation of Organic Acids in Corn Roots. III. Utilization of Exogenously Supplied Acids.

Abstract:

:The rates of utilization of exogenously supplied (14)C labeled acids by corn roots was compared to the utilization of these acids generated endogenously in the mitochondria from acetate-(3)H. (14)C-labeled citrate, pyruvate, succinate, glutamate or aspartate were supplied with acetate-(3)H in a 15 minute pulse and the (14)C and (3)H contents of extracted acids were measured over a 4 hour period. It was found, in contrast to previous experiments with malate, that these exogenously added acids were used as rapidly as the endogenous forms. Apparently, therefore, these acids penetrate readily into the mitochondria and do not enter cytoplasmic pools which are not in ready equilibrium with those in the mitochondria. Small amounts of labeled glutamate were produced from succinate-2,3-(3)H by corn root tissue. Since glutamate would not be expected to be labeled by reactions of the tricarboxylic acid cycle it was concluded that it was produced rather directly from succinate. The minor pool of glutamate generated in this way retained its radioactivity while that generated in the cycle was rapidly lost. An extra-mitochondrial location of this pool of glutamate is therefore suggested.

journal_name

Plant Physiol

journal_title

Plant physiology

authors

Steer BT,Beevers H

doi

10.1104/pp.42.9.1197

subject

Has Abstract

pub_date

1967-09-01 00:00:00

pages

1197-201

issue

9

eissn

0032-0889

issn

1532-2548

journal_volume

42

pub_type

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