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Open AccessArticle

Salinity-Induced Changes of Multiparametric Fluorescence Indices of Tomato Leaves

Institute of Crop Science and Resource Conservation—Horticultural Science, University of Bonn, Auf dem Hügel 6, 53121 Bonn, Germany
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Agriculture 2014, 4(2), 132-146; https://doi.org/10.3390/agriculture4020132
Received: 11 January 2014 / Revised: 22 April 2014 / Accepted: 22 April 2014 / Published: 30 April 2014
The aim of our study was to identify appropriate multiparametric fluorescence ratios to evaluate the response of tomato (Solanum lycopersicum) genotypes to salinity. In this context, we hypothesized that the fluorescence indices BFRR_UV, FLAV, NBI and SFR provided by the multiparametric fluorescence technique reveal the impact of salinity on tomato leaves. For this purpose, the tomato genotypes H-2274, Harzfeuer and Rio Grande were grown in the greenhouse under standard or saline conditions. As reference measurements, we recorded the maximum photochemical efficiency of photosystem II (Fv/Fm) via pulse-amplitude-modulated (PAM) chlorophyll fluorescence (ChlF) and analyzed the concentrations of sodium (Na), potassium (K), magnesium (Mg), proline and chlorophyll (Chl). In general, “Harzfeuer” showed a more pronounced response to salinity, as revealed by the increase in Na and proline as well as the decrease in K concentration. Significant differences between the control and the salt treatment were also assessed with Fv/Fm. The ratios BFRR_UV, FLAV, SFR_G and NBI_G increased significantly in the salinity-exposed plants. These ratios, compared with Fv/Fm, also provide precise but more rapid information about the impact of salinity on tomato leaves. On this basis, we demonstrate that the multiparametric fluorescence indices provide a valuable, rapid and practical tool for the in situ monitoring of the physiological status of plants exposed to salinity. View Full-Text
Keywords: abiotic stress; pigment fluorescence; NaCl; physiological responses; salinity; Solanum lycopersicum abiotic stress; pigment fluorescence; NaCl; physiological responses; salinity; Solanum lycopersicum
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Kautz, B.; Hunsche, M.; Noga, G. Salinity-Induced Changes of Multiparametric Fluorescence Indices of Tomato Leaves. Agriculture 2014, 4, 132-146.

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