In this paper there are given the results of a study of the relation of respiration to temperature, in seedlings of Vicia faba, and of the onset of geotropic response. It is shown that with due care and very accurate control of temperature constancy, one can get constant excretion of CO2 even over fairly long periods. The treatment of the experimental data shows that the Q10 ratio is of course a valueless "constant," as it is variable; but that the figure obtained for µ, the temperature characteristic (critical thermal increment), 16,250, is perfectly consistent with the values previously obtained for µ in respiratory oxidative processes in similar material. New data on the reaction time for the root of Vicia faba seedlings excited geotropically are given also. The study of the dependence of this time relation on temperature shows µ = 16,110, agreeing quantitatively with the value deduced previously from the relevant data of earlier investigators (Crozier, 1924). This points to the importance of some respiratory oxidative process as the agency controlling the onset of geotropic curvature.
Article| May 20 1929
RESPIRATION AND GEOTROPISM IN VICIA FABA. I
A. E. Navez
From the Laboratory of General Physiology, Harvard University, Cambridge.
Accepted: January 28 1929
Online Issn: 1540-7748
Print Issn: 0022-1295
Copyright, 1929, by The Rockefeller Institute for Medical Research
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A. E. Navez; RESPIRATION AND GEOTROPISM IN VICIA FABA. I . J Gen Physiol 20 May 1929; 12 (5): 641–667. doi: https://doi.org/10.1085/jgp.12.5.641
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