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Visible foliar injury caused by ozone alters the relationship between SPAD meter readings and chlorophyll concentrations in cutleaf coneflower

Lookup NU author(s): Professor Howard Neufeld, Emeritus Professor Alan Davison

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Abstract

The ability of the SPAD-502 chlorophyll meter to quantify chlorophyll amounts in ozone-affected leaves of cutleaf coneflower (Rudbeckia laciniata var. digitata) was assessed in this study. When relatively uninjured leaves were measured (percent leaf area affected by stipple less than 6%), SPAD meter readings were linearly related to total chlorophyll with an adjusted R 2 of 0.84. However, when leaves with foliar injury (characterized as a purple to brownish stipple on the upper leaf surface affecting more than 6% of the leaf area) were added, likelihood ratio tests showed that it was no longer possible to use the same equation to obtain chlorophyll estimations for both classes of leaves. Either an equation with a common slope or a common intercept was necessary. We suspect several factors are involved in altering the calibration of the SPAD meter for measuring chlorophyll amounts in visibly ozone-injured leaves, with the most likely being changes in either light absorption or scattering resulting from tissue necrosis. © Springer 2006.

Publication metadata

Author(s): Neufeld HS, Chappelka AH, Somers GL, Burkey KO, Davison AW, Finkelstein PL

Publication type: Article

Publication status: Published

Journal: Photosynthesis Research

Year: 2006

Volume: 87

Issue: 3

Pages: 281-286

ISSN (print): 0166-8595

ISSN (electronic): 1573-5079

Publisher: Springer Netherlands

URL: http://dx.doi.org/10.1007/s11120-005-9008-x

DOI: 10.1007/s11120-005-9008-x

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