NDLI: Mapping Intercellular CO2 Mole Fraction (C i) in Rosa rubiginosa Leaves Fed with Abscisic Acid by Using Chlorophyll Fluorescence Imaging1

Content Provider	PubMed Central
Author	Meyer, Sylvie Genty, Bernard
Copyright Year	1998
Abstract	Imaging of photochemical yield of photosystem II (PSII) computed from leaf chlorophyll fluorescence images and gas-exchange measurements were performed on Rosa rubiginosa leaflets during abscisic acid (ABA) addition. In air ABA induced a decrease of both the net CO2 assimilation (A n) and the stomatal water vapor conductance (g s). After ABA treatment, imaging in transient nonphotorespiratory conditions (0.1% O2) revealed a heterogeneous decrease of PSII photochemical yield. This decline was fully reversed by a transient high CO2 concentration (7400 μmol mol−1) in the leaf atmosphere. It was concluded that ABA primarily affected A n by decreasing the CO2 supply at ribulose-1,5-bisphosphate carboxylase/oxygenase. Therefore, the A n versus intercellular mole fraction (C i) relationship was assumed not to be affected by ABA, and images of C i and g s were constructed from images of PSII photochemical yield under nonphotorespiratory conditions. The distribution of g s remained unimodal following ABA treatment. A comparison of calculations of C i from images and gas exchange in ABA-treated leaves showed that the overestimation of C i estimated from gas exchange was only partly due to heterogeneity. This overestimation was also attributed to the cuticular transpiration, which largely affects the calculation of the leaf conductance to CO2, when leaf conductance to water is low.
Starting Page	947
File Format	PDF
ISSN	15322548
e-ISSN	15322548
Journal	Plant Physiology
Issue Number	3
Volume Number	116
Language	English
Publisher	American Society of Plant Physiologists
Publisher Date	1998-03-01
Access Restriction	Open
Rights Holder	American Society of Plant Physiologists
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics Physiology Plant Science

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