Peroxidação lipídica, teor de prolina livre e açúcares solúveis como indicadores de tolerância ao estresse oxidativo em algumas linhagens avançadas de trigo-duro (Triticum durum Desf.).

• Abdelmalek Oulmi Department of Biology and Plant Ecology, Valorization of Natural Biological Resources Laboratory, Farhat Abbas University Setif 1, Algeria. https://orcid.org/0000-0002-1716-711X
• Sarah Benkadja Department of Agronomy, Valorization of Natural Biological Resources Laboratory, Farhat Abbas University of Setif, Algeria. https://orcid.org/0000-0001-7737-6135
• Ali Guendouz National Institute of Agronomic Research of Algeria (INRAA), Setif Unit, Algeria. https://orcid.org/0000-0002-9081-6497
• Benalia Frih Department of Biology and Plant Ecology, Valorization of Natural Biological Resources Laboratory, Farhat Abbas University Setif 1, Algeria. https://orcid.org/0000-0001-6463-7340
• Amor Mehanni Technical Institute of Field Crops, Setif, Algeria. https://orcid.org/0000-0002-7479-3475
• Samir Selloum Technical Institute of Field Crops, Setif, Algeria. https://orcid.org/0000-0002-5991-6393

Palavras-chave: danos à membrana, glifosato, espécies reativas de oxigênio, tolerância

Resumo

O estresse oxidativo induzido pelo glifosato é um fenômeno complexo causado por um desequilíbrio entre espécies reativas de oxigênio (ROS) e antioxidantes nas células vegetais. A presente pesquisa foi realizada no instituto de culturas de campo, Estação Experimental Agrícola de Setif (ITGC-AES), para avaliar a resposta de algum trigo duro (Triticum Durum Desf.) linhas expostas ao estresse oxidativo induzido pelo herbicida glifosato. Na fase de pontuação, uma solução de 5 mm de glifosato foi pulverizada sobre as folhas de bandeira, e cada medição foi tomada 48 horas após a aplicação do glyphosate. A peroxidação lipídica, a prolina livre e os açúcares solúveis foram determinados. Os resultados indicaram que o estresse oxidativo aumentou o teor de Peroxidação lipídica, prolina e açúcares solúveis nas folhas de bandeira. A análise da variância revelou diferenças significativas entre os genótipos testados, o aumento do nível de Peroxidação lipídica é muito maior nas linhas avançadas G5 e G3, nas quais a peroxidação lipídica e danos à membrana são maiores. Os danos oxidativos também aumentaram o teor de prolina nas linhas G3 e G4, e açúcares solúveis na linha G5, que estavam mostrando uma alta tolerância ao estresse oxidativo induzido.

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