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Agriculture 2014, 4(2), 58-78; doi:10.3390/agriculture4020058
Article

Fluorescence Indices for the Proximal Sensing of Powdery Mildew, Nitrogen Supply and Water Deficit in Sugar Beet Leaves

* ,
 and
Department of Horticultural Sciences, Institute of Crop Science and Resource Conservation, University of Bonn, Auf dem Huegel 6, Bonn D-53121, Germany
* Author to whom correspondence should be addressed.
Received: 15 January 2014 / Revised: 12 February 2014 / Accepted: 13 March 2014 / Published: 28 March 2014
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Abstract

Using potted sugar beet plants we aimed to investigate the suitability of four fluorescence indices to detect and differentiate the impact of nitrogen supply, water deficit and powdery mildew in two sugar beet cultivars (Beta vulgaris L.). Plants were grown inside a polytunnel under two nitrogen levels combined with water deficit or full irrigation. Changes in plant physiology were recorded at two physiological stages with a multiparametric handheld fluorescence sensor and a fluorescence imaging system. The analysis of chlorophyll content and osmotic potential served as reference. Based on our results, the fluorescence indices “Nitrogen Balance Index” and “Simple Fluorescence Ratio” responded quite sensitively to drought stress and mildew infection. Moreover, the blue-to-far-red fluorescence ratio revealed significant stress-induced alterations in the plant physiology. In all, fluorescence indices might be used as single or combined indices for successful stress sensing. However, a robust stress differentiation by using only one fluorescence ratio could not be accomplished.
Keywords: blue-green fluorescence; chlorophyll fluorescence; abiotic stresses; biotic stresses; precision agriculture blue-green fluorescence; chlorophyll fluorescence; abiotic stresses; biotic stresses; precision agriculture
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Leufen, G.; Noga, G.; Hunsche, M. Fluorescence Indices for the Proximal Sensing of Powdery Mildew, Nitrogen Supply and Water Deficit in Sugar Beet Leaves. Agriculture 2014, 4, 58-78.

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