Fluorescence Changes in a Drying Maple Leaf Observed in the Visible and Near-Infrared
When the source of nutrients for a leaf are disrupted, the mechanisms for energy transfer, that are part of the photosynthetic process, undergo changes that alter the abortion and emission characteristics of the leaf. A series of fluorescence measurements made of a maple leaf as it dried, permit some of these changes to be observed. The emission peaks at approximately 690 nm and 740 nm are present throughout the measurements, although the intensity of the peaks vary. Additionally, a feature with an emission maximum at approximately 440 nm and an excitation maximum at approximately 330 nm appeared as the leaf dried and rave provide an alternate indication of stress. Removing a leaf from the tree accelerates changes that occur in vivo when a plant is under stress. These changes are not visually apparent; however, analysis of the data indicate the strong probability that they would be easily detected with a remote-sensing instrument such as the Fraunhofer luminescence detector (FLD).
Key wordschlorophyll fluorescence Fraunhofer FLD plant stress
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