The physiology of photosynthesis / by Sir Jagadis Chunder Bose.

  • Jagadish Chandra Bose
Date:
1924
Catalogue details

Licence: In copyright

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

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    change in the other factor, temperature, through a con- siderable range of variation. Table XXXVII.—Showing Combined Effects of Partial Factors Temperature and Light. Temperature carried through a Cycle, and Light in Two Stages of 0-4 S and S Activity under Light Temperature in Ratio of Two Centigrade 0 -4 S S Activities 20-0 86-0 202 -O 2-35 21-0 88-5 215-0 2-4 23-0 i°o-5 253-0 2-4 25-0 I3I-7 328-0 2-5 27-0 175-3 436-0 2-5 29-0 236-5 585-0 2-5 3° -° 248 4 650-0 2 -6 31-0 232 -o 694-5 — 33-o 189-0 732 0 — 34-° — 653-o — 35'° 575-5 The thick numbers represent the two optimum temperatures under 0-4 S and S respectively Translocation of the optimum temperature under increased intensity of light.—Before discussing these results I would draw attention to the effect of intensity of light in modifying the optimum temperature already referred to on p. 139. We find in the table that for 0-4 S the optimum was at 30° C., the activity being 248-4. A rise of i° C. caused a depression to 232-0. In contrast to this is the effect of the more in- tense light, under wdiich the optimum is raised to 330 C., the activity being 732-0. Further rise of temperature of a single degree produced a fall to 653. Detailed consideration of the two characteristic curves.—• The two curves, for S and for o • 4 S (the latter multiplied 2 • 5 times), are seen to run parallel to each other. The notice- able divergence is after 30° C., the optimum for 0-4 S, after which the curve is reversed, whereas the curve for S con- tinues to rise until the optimum is reached three degrees
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