By Street, Herbert Edward.; Öpik, Helgi; Willis, Arthur John; Rolfe, Stephen A
summary: 4th ed
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Additional resources for The physiology of flowering plants
A final maximal limit to the rate of photosynthesis would be set by the plant’s photosynthetic system. e. with all the external controlling factors at their optimum levels. Photosynthesis is also subject to controls from the rate of utilization of photosynthate: accumulation of end products in leaves is inhibitory, utilization by growing areas (‘sinks’) is stimulatory. The effects of temperature on photosynthesis are complex. Temperature has no effect on light absorption and on the primary photochemical reactions, which proceed with a Q10 of 1.
The majority opinion associates the rise in atmospheric CO2 levels with the ‘greenhouse effect’, a rise in temperature. An opposing view is that there will be increased cloud cover which will reflect so much of the incoming solar radiation back into space that the net effect will be a cooling – and increased cloudiness will decrease photosynthesis. Finally, the potential for photosynthesis will depend on the amount of plant biomass, and this is being diminished by deforestation, by desertification following agricultural mismanagement, and by urban development.
3ATP þ 2NADPH þ 2Hþ ÁG ¼ 565 kJ (2:8) The positive value of the free energy, ÁG, indicates an energy gain, or input. For C4 and CAM plants the extra synthesis of ATP must be taken into account. The energy input of course comes from the light. Light has a dual nature. Although it travels as a continuous wave motion, it can also be regarded as composed of particles, photons, each associated with one quantum of energy. 3, one quantum at a time is absorbed by a molecule and energizes one photochemical reaction.
The physiology of flowering plants by Street, Herbert Edward.; Öpik, Helgi; Willis, Arthur John; Rolfe, Stephen A