The physiology of photosynthesis / by Sir Jagadis Chunder Bose.

  • Jagadish Chandra Bose
Date:
1924
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Licence: In copyright

Credit: The physiology of photosynthesis / by Sir Jagadis Chunder Bose. Source: Wellcome Collection.

    304/316 page 280
    The volume is thus a linear function of the absolute temperature. It may be said in general that when A and B are so related that any change in B produces a corresponding variation in A, then A is a function of B. The relation between B and A is discovered by plotting a curve in which the ordinate represents the induced change and the abscissa the variation that induces it. Photo- synthesis is a function of light, of C02-concentration, of temperature and of the tonic condition of the plant. The relation between photosynthesis and each of these factors is found from the characteristics of the different photo- synthetic curves. It is shown that more satisfactory results can be obtained by basing the measurement upon a physiological rather than upon a physical scale. The physiological zero is found by producing backwards the straight median portion of the photosynthetic curve until it intersects the abscissa. It is also shown that when measurements are taken on the physiological scale the photosynthetic activity is found to be a linear function of each of the different factors. It has been explained how the average coefficient is obtained by the Differential Method, dividing the increment of activity by the increment of the particular factor. In the absolute determination we obtain the coefficient for every point in the median range by dividing the activity by the value of the factor on the physiological scale. The general law of photosynthesis for variation of the individual factors of temperature, of C02-concentration, of light and of tonic condition is expressed by ^ is a constant; ^ is a constant; ^ is a constant ; T t L ^ is a constant. P The change in photosynthetic activity under the varia- tion of one factor is found from the laws of photosynthesis
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