Some Observations on Potassium Accumulation in Corn Root Mitochondria.
نویسندگان
چکیده
منابع مشابه
Inorganic Phosphate Accumulation by Corn Mitochondria'
Swnmary. An investigation has been made of the possibility of tutilizing the potential energy of the contracted state of corn mitochondria to drive Ca + inorganic phosphate accumulation. Contraction was obtained with succinate or NADH oxidation. In the succinate experiments the mitochondria were contracted in buffered KCl layered over sucrose in centrifuge tubes and centrifuged down through dis...
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A particulate component of mitochondria is described which is observed in negatively stained preparations of unfixed whole mitochondria or their fragments. It consists of a roughly spherical particle, approximately 85 A in diameter, found on the surface of the cristae and probably also on the side of the mitochondrial envelope which faces the matrix. It is attached to the underlying membrane by...
متن کاملPotassium Stimulation of Corn Root Plasmalemma ATPase'
The stimulation by K+ of the initial rate of Hf-pumping by ATPase was studied in native plasmalemma (Zea mays L. var Mona) vesicles and in reconstituted vesicles with enzyme purified on a glycerol gradient. In reconstituted vesicles, a very high H+pumping rate (200,000% quenching per minute per milligram protein) was obtained with 9-amino-6-chloro-2-methoxyacridine provided that the pump was sh...
متن کاملMechanisms of passive potassium influx in corn mitochondria.
Corn mitochondria in 100 millimolar KCl show accelerated passive swelling upon addition of uncoupler. This unusual response has been compared with swelling produced by valinomycin, tripropyltin, and nigericin. It is concluded that the driving force for swelling lies with the chloride gradient and a high P(Cl):P(K) ratio, the chloride influx creating a negative membrane potential. The action of ...
متن کاملThe Stoichiometry of Respiration-driven Potassium Transport in Corn Mitochondria.
Determinations were made for corn (Zea mays L., WF9-Tms x M14) mitochondria of the stoichiometric relationship between K(+) transport and bond energy produced in respiration (K(+)/ approximately ratio). With inward pumping of potassium acetate activated by NADH oxidation, the initial rate of K(+) transported into the sucrose inaccessible space varied between 0.58 and 0.97 K(+)/ approximately , ...
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ژورنال
عنوان ژورنال: Plant Physiology
سال: 1959
ISSN: 0032-0889,1532-2548
DOI: 10.1104/pp.34.6.621