Analysis of Differences in Wheat Infected with Powdery Mildew Based on Fluorescence Imaging System
This study aimed to investigate the variation characteristics of rapid light-response curves of wheat leaves infected with powdery mildew. According to the heterogeneity between two selection patterns of area of interest (AOI), determination of fluorescen
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Anhui Academy of Agricultural Sciences, Hefei 230031, China [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected] 2 National Engineering Research Center for Information Technology in Agriculture, Beijing 100097, China [email protected] 3 College of Life Science and Forestry, Chongqing University of Art and Science, Chongqing 402160, China
Abstract. This study aimed to investigate the variation characteristics of rapid light-response curves of wheat leaves infected with powdery mildew. According to the heterogeneity between two selection patterns of area of interest (AOI), determination of fluorescence induction parameters and fitting of rapid lightresponse curves were conducted based on fluorescence imaging system in wheat powdery mildew experimental plots. The results showed that relative electron transport rate rETR was reduced with the increase of disease severity level; rETR of the rectangle selection pattern was relatively low. Specifically, the reduction in rETR is mainly influenced by the decrease of absorption coefficient Abs. Among fitting parameters of rapid light-response curves, the potential and the maximum relative electron transport rate, initial slope, light suppression param‐ eter and semi-saturation intensity were reduced with the increase of disease severity level; the heterogeneity of fitting parameters between two selection patterns reflected the “critical state” of leaf fluorescence characteristics. Infected leaves at severe level (80 %) had relatively low light-harvesting capacity and tolerance to strong light, which easily caused light inhibition. According to the lateral heterogeneity analysis of photosynthesis of wheat leaves infected with powdery mildew, there was relatively high heterogeneity between fluorescence parameters of wheat infected leaves, especially in leaves with lesions on the surface. Keywords: Fluorescence imaging system · Powdery mildew · Rapid lightresponse curve · Difference
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Introduction
Wheat powdery mildew (Blumeria graminis f. sp. tritici) is a major disease in worldwide wheat production, which is caused by infection of Erysiphe qraminis D.C. f. sp. tritici marchal. After infection of Erysiphe qraminis D.C. f. sp. tritici marchal., greatly © IFIP International Federation for Information Processing 2016 Published by Springer International Publishing AG 2016. All Rights Reserved D. Li and Z. Li (Eds.): CCTA 2015, Part II, IFIP AICT 479, pp. 68–75, 2016. DOI: 10.1007/978-3-319-48354-2_7
Analysis of Differences in Wheat Infected with Powdery Mildew
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propagated pathogenic bacteria disrupt the moisture transport in wheat leaves and cause the destruction of chlorophyll. With the disease progression, wheat leaves show yellow spots or patchy lesions under severe situations, powder mildew layer is attached to the surface, leading to leaf chlorosis and yellowing or even death [1, 2]. Modulated pulse fluorescence analyzer (Imaging-Pam Mini-version: 24 × 32 mm) has a relatively large detection windo
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