Application of an Enzymatic Hydrolysed L-alpha-Amino Acid Based Biostimulant to Improve Sunflower Tolerance to Imazamox
Metadatos
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MDPI
Materia
Amino acids Biostimulant Glutathione Herbicide Safener Sunflower
Date
2022-10-19Referencia bibliográfica
Navarro-León, E... [et al.]. Application of an Enzymatic Hydrolysed L-alpha-Amino Acid Based Biostimulant to Improve Sunflower Tolerance to Imazamox. Plants 2022, 11, 2761. [https://doi.org/10.3390/plants11202761]
Patrocinador
PAI program (Plan Andaluz de Investigacion, Grupo de Investigacion) AGR282Résumé
Herbicides, commonly used in agriculture to control weeds, often cause negative effects
on crops. Safeners are applied to reduce the damage to crops without affecting the effectiveness of
herbicides against weeds. Plant biostimulants have the potential to increase tolerance to a series of
abiotic stresses, but very limited information exists about their effects on herbicide-stressed plants.
This study aims to verify whether the application of a potential safener such as Terra-Sorb®, an
L- -amino acid-based biostimulant, reduces the phytotoxicity of an Imazamox-based herbicide
and to elucidate which tolerance mechanisms are induced. Sunflower plants were treated with
Pulsar® 40 (4% Imazamox) both alone and in combination with Terra-Sorb®. Plants treated with the
herbicide in combination with Terra-Sorb® showed higher growth, increased acetolactate synthase
(ALS) activity, and amino acid concentration with respect to the plants treated with Imazamox
alone. Moreover, the biostimulant protected photosynthetic activity and reduced oxidative stress.
This protective effect could be due to the glutathione S-transferase (GST) induction and antioxidant
systems dependent on glutathione (GSH). However, no effect of the biostimulant application was
observed regarding phenolic compound phenylalanine ammonium-lyase (PAL) activity. Therefore,
this study opens the perspective of using Terra-Sorb® in protecting sunflower plants against an
imazamox-based herbicide effect.