Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 525621
Title The effects of environmental factors on the transpiration of leaves, with special reference to stomatal light response
Author(s) Kuiper, P.J.C.
Source University. Promotor(en): E.C. Wassink. - Wageningen : Veenman - 49
Publication type Dissertation, internally prepared
Publication year 1961
Keyword(s) transpiratie - evapotranspiratie - transpiration - evapotranspiration - cum laude
Categories Plant Physiology
Abstract The transpiration of cut leaves (bean, tomato, Hyoscyamus ) in potometers was studied as affected by light intensity, leaf temperature and air humidity, with special attention to stomatal light response. Fick's diffusion law could be applied to evaporation of water and to transpiration of leaves. Evaporation was found to be proportional to Vα(V = wind velocity),αbeing 0.76 in turbulent air. Transpiration rate increased rectilinearly with light intensity below 5 x 10 4erg sec. -1cm -2, mainly through increase in leaf temperature by radiation with incandescent light, containing much infrared radiation; with fluorescent tubes, sodium lamps, or high- pressure mercury vapour lamps, transpiration increase was mainly due to increase in stomatal opening. Stomatal resistance to diffusion could be exactly determined by measurements on transpiration, leaf temperature and air humidity. Transpiration increases at higher light intensities (saturation) were entirely due to increase in leaf temperature.

Regulation of transpiration by small changes in stomatal resistance to diffusion was most pronounced at small stomatal apertures. In normal air, the stomatal response to light depended on photosynthesis of the guard cell chloroplasts (use of CO 2 ) and the response of the guard cells to CO 2 (stomatal feed back, causing fluctuations in the degree of stomatal opening).

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