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Chlorophyll index, photochemical reflectance index and chlorophyll fluorescence measurements of rice leaves supplied with different N levels

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Title Chlorophyll index, photochemical reflectance index and chlorophyll fluorescence measurements of rice leaves supplied with different N levels
 
Creator Shrestha, S.
Brueck H
Asch, F.
 
Subject agriculture
climate
chlorophylls
nitrogen
nitrogen fertilizers
 
Description Rapid and non-destructive diagnosis of plant N status is highly required in order to optimise N fertilizer management and use-efficiency. Additionally to handheld devices for measurements of chlorophyll indices (e.g., SPAD meter) parameters of canopy reflectance via remote sensing approaches are intensively investigated and the photochemical reflectance index (PRI) appears to be a reliable indicator for changes of the epoxidation state of xanthophyll cycle pigments. In order to assess the suitability of a handheld PRI as an additional tool for N diagnosis, rice plants were grown in a nutrient solution experiment with seven N-supply levels (0.18 5.71 mM) and CI (SPAD) and PRI values and chlorophyll fluorescence parameters measured 20 and 28 days after onset of treatments. N-supply had effects on both CI (SPAD) and PRI values with a more reliable differentiation between levels. Maximum quantum yield of PSII (Fv/Fm), actual efficiency of PSII photochemistry (?PSII) and regulated non-photochemical quenching (?NPQ) did not differ significantly between N levels. Non-photochemical quenching (NPQ) and fast- relaxing NPQ (NPQF) were significantly affected by N-supply. NPQ and NPQF, but not the slow-relaxing component (NPQS), were correlated with CI (SPAD) and PRI values. This finding which has not been reported for N-supply effects so far is indirect evidence that low N-supply induced xanthophyll cycle activity and that PRI values are able to indicate this at least in plants subject to severe N deficiency.
 
Date 2012-08
2014-08-15T12:13:22Z
2014-08-15T12:13:22Z
 
Type Journal Article
 
Identifier Shrestha S, Brueck H, Asch F. 2012. Chlorophyll index, photochemical reflectance index and chlorophyll fluorescence measurements of rice leaves supplied with different N levels. Journal of Photochemistry and Photobiology B: Biology 113:7-13.
1011-1344
https://hdl.handle.net/10568/42078
https://doi.org/10.1016/j.jphotobiol.2012.04.008
 
Language en
 
Rights Copyrighted; all rights reserved
Limited Access
 
Format 7-13
 
Publisher Elsevier BV
 
Source Journal of Photochemistry and Photobiology B: Biology