Barco Antoñanzas, María

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https://academica-e.unavarra.es/handle/2454/48664

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Barco Antoñanzas

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María

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Ciencias del Medio Natural

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IMAB. Research Institute for Multidisciplinary Applied Biology

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0000-0002-4086-9590

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88867

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811358

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Author: Font Farre, María × Subject: Amaranthus palmeri ×

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    PublicationOpen Access
    Cysteine proteases are activated in sensitive Amaranthus palmeri populations upon treatment with herbicides inhibiting amino acid biosynthesis
    (Wiley, 2023) Barco Antoñanzas, María; Font Farre, María; Eceiza, Mikel Vicente; Gil Monreal, Miriam; Van der Hoorn, Reiner; Royuela Hernando, Mercedes; Zabalza Aznárez, Ana; Institute for Multidisciplinary Research in Applied Biology - IMAB; Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa
    The herbicides glyphosate and pyrithiobac inhibit the enzyme 5-enolpyruvylshikimate3-phosphate synthase (EPSPS) in the aromatic amino acid biosynthetic pathway and acetolactate synthase (ALS) in the branched-chain amino acid biosynthetic pathway, respectively. Here we characterise the protease activity profiles of a sensitive (S), a glyphosate-resistant (GR) and a multiple-resistant (MR) population of Amaranthus palmeri in response to glyphosate and pyrithiobac. Amino acid accumulation and cysteine protease activities were induced with both herbicides in the S population and with pyrithiobac in the GR population, suggesting that the increase in cysteine proteases is responsible for the increased degradation of the available proteins and the observed increase in free amino acids. Herbicides did not induce any changes in the proteolytic activities in the populations with target-site resistance, indicating that this effect was only induced in sensitive plants.