biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 51:395-398, 2007 | DOI: 10.1007/s10535-007-0085-x

Changes in spectral reflectance of a foliar lichen Umbilicaria hirsuta during desiccation

J. Gloser1,*, V. Gloser1
1 Department of Plant Physiology and Anatomy, Faculty of Science, Masaryk University in Brno, Brno, Czech Republic

Water potential (ψw) and water saturation deficit (WSD), and several reflectance (R) indexes were assessed in an aerophytic lichen Umbilicaria hirsuta (Sw. ex Westr.) Hoffm. The water index (WI, R900/R970) and normalized difference vegetation index, NDVI [(R900-R680)/(R900+R680)] were strongly correlated both with the ψw and the WSD of lichen thalli. No significant changes during desiccation were found in structural independent pigment index, SIPI [(R800-R445)/(R800-R680)]. Sensitivity of the spectral detection of water status was rather small at high hydration level (WSD < 25 %, or ψw > -1 MPa), but this is not much limiting its value and potential use, because physiological processes in lichens are usually inhibited at much lower values of ψw than in leaves of vascular plants.

Keywords: reflectance indexes; upper cortex; water deficit; water potential
Subjects: desiccation; lichen; spectral reflectance; Umbilicaria hirsuta; water saturation deficit; water stress

Received: January 2, 2006; Accepted: July 9, 2006; Published: June 1, 2007  Show citation

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Gloser, J., & Gloser, V. (2007). Changes in spectral reflectance of a foliar lichen Umbilicaria hirsuta during desiccation. Biologia plantarum, 51(2), 395-398. doi: 10.1007/s10535-007-0085-x
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