Decrease in Net Photosynthesis Caused by Respiration | Zendy

B. Bravdo | Zendy

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Decrease in Net Photosynthesis Caused by Respiration

Author(s) -

B. Bravdo

Publication year - 1968

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.43.4.479

Subject(s) - photosynthesis , atmosphere (unit) , respiration , resistor , compensation (psychology) , chemistry , botany , controlled atmosphere , atmospheric sciences , environmental science , horticulture , physics , biology , thermodynamics , psychoanalysis , psychology , quantum mechanics , voltage

CO(2) exchange between air and leaf is conceived as a current along a resistor with a respiratory current, unaffected by CO(2) concentration, entering the resistor. The conclusion follows that a plant placed in an atmosphere free of CO(2) will increase the CO(2) concentration to the compensation concentration along a curve determined by the resistor and the volume of the atmosphere. This was verified. Also a photosynthesis rate calculated from the parameters of the observed curve agreed with an independent observation of photosynthesis in CO(2)-free air. The decrease in net photosynthesis caused by respiration is, according to the model, the CO(2) compensation concentration divided by the concentration in the atmosphere.

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