Instrument for measuring the photosynthetic activities of...

Details Instrument for measuring the photosynthetic activities of... Instrument for measuring the photosynthetic activities of...

G - Physics

01

N

73/51.5

G01N 33/48 (2006.01) G01N 21/64 (2006.01) G01N 21/84 (2006.01) G01N 21/63 (2006.01)

Patent

CA 1266997

ABSTRACT OF THE DISCLOSURE Instrument for measuring the photosynthetic activities of plants An instrument (2) for simultaneously measuring a plurality of parameters indicative of photosynthetic activity of a leaf in vivo comprises: (a) a gas tight chamber (4) for enclosing the leaf (5), (b) means (10) for illuminating the leaf within the chamber with modulated light not capable of driving photosynthesis, (c) means (14) for detecting modulated fluorescence emission from the leaf, (d) means for illuminating the leaf with photosynthetically active light, (e) means (43) for measuring the light absorbed by the leaf, (f) and means (32) for measuring the rate of uptake of carbon dioxide gas by the leaf. The instrument may also comprise means for measuring the rate of loss of water by the leaf, and for measuring the temperature in the chamber. The invention includes a method of simultaneously mesuring a plurality of parameters indicative of photosynthetic activity of a leaf in vivo.

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