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Stress Detection Using Proximal Sensing of Chlorophyll Fluorescence on the Canopy Level

Ahlman, Linnéa and Bånkestad, Daniel and Khalil, Sammar and Bergstrand, Karl-Johan and Wik, Torsten (2021). Stress Detection Using Proximal Sensing of Chlorophyll Fluorescence on the Canopy Level. AgriEngineering. 3 , 648-668
[Research article]

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Abstract

Chlorophyll fluorescence is interesting for phenotyping applications as it is rich in biological information and can be measured remotely and non-destructively. There are several techniques for measuring and analysing this signal. However, the standard methods use rather extreme conditions, e.g., saturating light and dark adaption, which are difficult to accommodate in the field or in a greenhouse and, hence, limit their use for high-throughput phenotyping. In this article, we use a different approach, extracting plant health information from the dynamics of the chlorophyll fluorescence induced by a weak light excitation and no dark adaption, to classify plants as healthy or unhealthy. To evaluate the method, we scanned over a number of species (lettuce, lemon balm, tomato, basil, and strawberries) exposed to either abiotic stress (drought and salt) or biotic stress factors (root infection using Pythium ultimum and leaf infection using Powdery mildew Podosphaera aphanis). Our conclusions are that, for abiotic stress, the proposed method was very successful, while, for powdery mildew, a method with spatial resolution would be desirable due to the nature of the infection, i.e., point-wise spread. Pythium infection on the roots is not visually detectable in the same way as powdery mildew; however, it affects the whole plant, making the method an interesting option for Pythium detection. However, further research is necessary to determine the limit of infection needed to detect the stress with the proposed method.

Authors/Creators:Ahlman, Linnéa and Bånkestad, Daniel and Khalil, Sammar and Bergstrand, Karl-Johan and Wik, Torsten
Title:Stress Detection Using Proximal Sensing of Chlorophyll Fluorescence on the Canopy Level
Series Name/Journal:AgriEngineering
Year of publishing :2021
Volume:3
Page range:648-668
Number of Pages:21
Associated Programs and Other Stakeholders:Z - SLU - Library > Odla mera
ISSN:2624-7402
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Horticulture
(A) Swedish standard research categories 2011 > 1 Natural sciences > 102 Computer and Information Science > 10206 Computer Engineering
Keywords:abiotic stress, biotic stress, classification, fluorescence dynamics, lettuce, lemon balm, tomato, basil, strawberries
URN:NBN:urn:nbn:se:slu:epsilon-p-113164
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-113164
Additional ID:
Type of IDID
DOI10.3390/agriengineering3030042
ID Code:25091
Faculty:LTV - Fakulteten för landskapsarkitektur, trädgårds- och växtproduktionsvetenskap
Department:(LTJ, LTV) > Department of Biosystems and Technology (from 130101)
Deposited By: SLUpub Connector
Deposited On:30 Aug 2021 08:25
Metadata Last Modified:31 Aug 2021 04:01

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