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Charles J. Lyon 《The Journal of general physiology》1927,10(4):599-615
The active component of phosphate solutions, in relation to promoter action on oxidising enzymes, is the PO4
'''''' ion. This is shown by the demonstration of a hyperbolic relationship between per cent production of CO2 (of Elodea) and pPO4, the measure of the phosphate ion potential. This is consistent with the rate of respiration as affected by changing pPO4 through change of total phosphate concentration while pH is kept constant. The equation for this relationship is (CO2 – a) (pPO4 – b)n = K where a, b, n, and K are constants and n = 1. The same relationship to phosphate ion concentration, expressed by the equation (Activity of enzyme) (pPO4)n = K, where n and K are constants and n varies from 1 to 6 under different conditions, appears to hold for some other enzyme actions, including those of peroxidase and pancreatic lipase. 相似文献
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Summary Gibberellic acid (GA3) accelerated abscission when applied, in a wide concentration range, to excised abscission zones of cotton. Abscission was promoted equally by distal or proximal applications of from 10-3 to 100 g. A slight, but inconsistent, abscission retardation was obtained with distal applications of 10-6 and 10-7 g.Seven different gibberellins accelerated abscission equally when applied distally at amounts of 5×10-4 to 5×10-1 g per abscission zone. At 5×10-5 g there were great differences in effectiveness; their activities can be ranked: A3>A5A4>A7=A8>A1=A9.The ready translocatability of GA3 was suggested when 1.0 or 0.01 g was applied to one petiole, and the opposite untreated petiole abscised at the same time as the treated one. However, 0.001 g was not effective in moving across the stem and inducing abscission of the untreated petiole.The rate of abscission of petioles treated with 1.0 g GA3 was not affected by increasing the length of the petiole from 3 to 9 mm. However, abscission of petioles treated with smaller amounts is inversely proportional to petiole length.The rate of abscission of petioles treated with GA3 decreased with increasing seedling age; there was a simultaneous increase in abscission rate of the controls.Part of this research was based on a portion of a thesis submitted by the senior author to the Graduate Division, University of California, Davis, in partial fulfillment of the requirements for the M.S. degree. 相似文献