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Effect of Potassium Deficiency on Photosynthesis, Respiration and the Utilization of Photosynthetic Reductant by Immature Bean Leaves 1
Author(s) -
Ozbun J. L.,
Volk R. J.,
Jackson W. A.
Publication year - 1965
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1965.0011183x000500010021x
Subject(s) - south carolina , library science , agricultural experiment station , photosynthesis , biology , botany , political science , agriculture , ecology , computer science , public administration
THE depression in plant growth resulting from low potassium supplies has been attributed in part to accelerated respiration and in part to diminished rates of photosynthetic CO2 fixation (17, 18, 21). The increase in respiration associated with K deficiency may originate through an uncoupling of oxidative phosphorylation from respiratory electron t ranspor t . Pressman and Lardy (19, 20) observed, with rat liver mitochondria, that K addition increased both O2 uptake and phosphorylation. However, when O2 uptake was stimulated maximally by 2, 4-dinitrophenol, the addition of K did not stimulate O2 uptake. The inhibition of photosynthetic CO2 uptake has also been attributed to an uncoupling of photophosphorylation from the associated electron transfer system (12, 14). In previous work (16) O2 and CO2 were utilized to measure concurrent ly the rates of CO2 uptake, CO2