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Kanagendran, Arooran

Nom
Kanagendran, Arooran
Affiliation principale
Fonction
Ancien.ne collaborateur.trice
Identifiants
https://libra.unine.ch/handle/123456789/33268
_
0000-0002-4302-1536

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  • Publication
    Accès libre
    Odor-based real-time detection and identification of pests and diseases attacking crop plants
    (2024-07-29)
    Marques Arce, Carla C. 
    ;
    Mamin, Marine 
    ;
    Terunobu Akiyama
    ;
    Röder, Gregory 
    ;
    Kanagendran, Arooran 
    ;
    Kosuke Minami
    ;
    Degen, Thomas 
    ;
    Genki Yoshikawa
    ;
    Defossez, Emmanuel 
    ;
    Felipe Lopez-Hilfiker
    ;
    Rasmann, Sergio 
    ;
    Luca Cappellin
    ;
    Turlings, Ted 
    Plants respond to attacks by herbivores and pathogens by releasing specific blends of volatile compounds and the resulting odor can be specific for the attacking species. We tested if these odors can be used to monitor the presence of pests and diseases in agriculture. Two methods were used, one employing piezoresistive membrane surface stress sensors and the other proton-transfer reaction mass spectrometry. Under laboratory conditions, both techniques readily distinguished between maize plants that were either undamaged, infested by caterpillars, or infected by a fungal pathogen. Under outdoor conditions, the spectrometer could be used to recognize plants with simulated caterpillar damage with about 80% accuracy. Further finetuning of these techniques should lead to the development of odor-sensing mobile devices capable of alerting farmers to the presence and exact location of pests and diseases in their fields.
  • Publication
    Accès libre
    Cowpea volatiles induced by beet armyworm or fall armyworm differentially prime maize plants
    (2024-01-01)
    Kanagendran, Arooran 
    ;
    Turlings, Ted 
    Exposure to herbivore-induced plant volatiles (HIPVs) is known to enhance the defense responses in plants. This so-called priming effect has only been marginally studied in intercropping systems. We tested whether HIPVs from cowpea, which often serves as an intercrop alongside maize, can prime herbivore-induced volatile emissions in maize. Conventional volatile collection assays and real-time mass spectrometry revealed that maize plants that were exposed to HIPVs from cowpea infested with Spodoptera exigua caterpillars emitted more than control plants when they themselves were subsequently damaged by the same pest. The enhanced emission was only evident on the first day after infestation. Maize plants that were exposed to HIPVs from cowpea infested by S. frugiperda larvae showed no priming effect and released considerably less upon S. frugiperda infestation than upon S. exigua infestation. The latter may be explained by the fact that S. frugiperda is particularly well adapted to feed on maize and is known to suppress maize HIPV emissions. Our results imply that HIPVs from cowpea, depending on the inducing insect herbivore, may strongly prime maize plants. This deserves further investigation, also in other intercropping systems, as it can have important consequences for tritrophic interactions and crop protection.