Salinity-Induced Changes of Multiparametric Fluorescence Indices of Tomato Leaves

Burkard Kautz, Mauricio Hunsche and Georg Noga
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Burkard Kautz: Institute of Crop Science and Resource Conservation—Horticultural Science, University of Bonn, Auf dem Hügel 6, 53121 Bonn, Germany
Mauricio Hunsche: Institute of Crop Science and Resource Conservation—Horticultural Science, University of Bonn, Auf dem Hügel 6, 53121 Bonn, Germany
Georg Noga: Institute of Crop Science and Resource Conservation—Horticultural Science, University of Bonn, Auf dem Hügel 6, 53121 Bonn, Germany

Agriculture, 2014, vol. 4, issue 2, 1-15

Abstract: 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.

Keywords: abiotic stress; pigment fluorescence; NaCl; physiological responses; salinity; Solanum lycopersicum (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2014
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