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Title: Image-Based Methods to Score Fungal Pathogen Symptom Progression and Severity in Excised Arabidopsis Leaves

Journal Article · · Plants
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [5]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Helsinki (Finland). Viikki Plant Science Center; Univ. of Helsinki (Finland). National Plant Phenotyping Infrastructure
  2. Univ. of Helsinki (Finland). Viikki Plant Science Center
  3. Univ. of Helsinki (Finland). Viikki Plant Science Center; Univ. of Helsinki (Finland). National Plant Phenotyping Infrastructure; Natural Resources Inst. (Luke), Piikkio (Finland)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States). Bredesen Center for Interdisciplinary Research
  5. Univ. of Helsinki (Finland). Viikki Plant Science Center; Univ. of Helsinki (Finland). National Plant Phenotyping Infrastructure

Image-based symptom scoring of plant diseases is a powerful tool for associating disease resistance with plant genotypes. Advancements in technology have enabled new imaging and image processing strategies for statistical analysis of time-course experiments. There are several tools available for analyzing symptoms on leaves and fruits of crop plants, but only a few are available for the model plant Arabidopsis thaliana (Arabidopsis). Arabidopsis and the model fungus Botrytis cinerea (Botrytis) comprise a potent model pathosystem for the identification of signaling pathways conferring immunity against this broad host-range necrotrophic fungus. Here, we present two strategies to assess severity and symptom progression of Botrytis infection over time in Arabidopsis leaves. Thus, a pixel classification strategy using color hue values from red-green-blue (RGB) images and a random forest algorithm was used to establish necrotic, chlorotic, and healthy leaf areas. Secondly, using chlorophyll fluorescence (ChlFl) imaging, the maximum quantum yield of photosystem II (Fv/Fm) was determined to define diseased areas and their proportion per total leaf area. Both RGB and ChlFl imaging strategies were employed to track disease progression over time. This has provided a robust and sensitive method for detecting sensitive or resistant genetic backgrounds. A full methodological workflow, from plant culture to data analysis, is described.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); Academy of Finland
Grant/Contract Number:
AC05-00OR22725; 283138; 256094; 25097
OSTI ID:
1761615
Journal Information:
Plants, Vol. 10, Issue 1; ISSN 2223-7747
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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