Investigation of Respiratory and Ion Transport Properties of Aging Bean Stem Slices | Zendy

Robert A. Floyd | Zendy; D. W. Rains | Zendy

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Investigation of Respiratory and Ion Transport Properties of Aging Bean Stem Slices

Author(s) -

Robert A. Floyd,

D. W. Rains

Publication year - 1971

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.47.5.663

Subject(s) - antimycin a , chemistry , cyanide , potassium , potassium cyanide , oxygen , sodium cyanide , respiration , sodium , biochemistry , ion transporter , biophysics , botany , biology , inorganic chemistry , electron transport chain , membrane , organic chemistry

Ion and oxygen uptake were studied on aging bean stem slices. Oxygen uptake was high immediately after slicing, decreased to a minimum at 100 minutes, and then increased again. Ion uptake per unit of O(2) uptake data suggested that metabolic energy was utilized almost exclusively for sodium transport in fresh tissue but was diverted to potassium transport as the slices aged. Oxygen and ion uptake in fresh slices was less sensitive to 2,4-dinitrophenol as compared to the aged slices, indicating major metabolic and physiological changes occurred during aging. This was further substantiated by the tissue response to cyanide and antimycin A. Oxygen uptake was decreased by cyanide (22% by 1 mm) and antimycin A (14% by 1 microgram per milliliter) in fresh slices but not in aged slices. Potassium uptake that developed during aging was sensitive to cyanide and antimycin A. The results are pertinent to understanding the role of the stem in regulating ion transport in plants.

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