Soybean Plants Exposed to Low Concentrations of Potassium Iodide Have Better Tolerance to Water Deficit through the Antioxidant Enzymatic System and Photosynthesis Modulation

Autor(es)

Lima, Jucelino de Sousa ; Andrade, Otavio Vitor Souza ; dos Santos, Leonidas Canuto ; de Morais, Everton Geraldo ; Martins, Gabryel Silva ; Mutz, Yhan S. ; Nascimento, Vitor L. ; Marchiori, Paulo Eduardo Ribeiro ; Lopes, Guilherme ; Guilherme, Luiz Roberto Guimaraes

• Tipo de documento: Artigo Científico
• Fonte: PLANTS-BASEL; v. 12, n. 13, p. 19-pg., 2023-07-01.

Resumo

Water deficit inhibits plant growth by affecting several physiological processes, which leads to the overproduction of reactive oxygen species (ROS) that may cause oxidative stress. In this regard, iodine (I) is already known to possibly enhance the antioxidant defense system of plants and promote photosynthetic improvements under adverse conditions. However, its direct effect on water deficit responses has not yet been demonstrated. To verify the efficiency of I concerning plant tolerance to water deficit, we exposed soybean plants to different concentrations of potassium iodide (KI) fed to pots with a nutrient solution and subsequently submitted them to water deficit. A decline in biomass accumulation was observed in plants under water deficit, while exposure to KI (10 and 20 .mol L-1) increased plant biomass by an average of 40%. Furthermore, exposure to KI concentrations of up to 20 &M improved gas exchange (similar to 71%) and reduced lipid peroxidation. This is related to the higher enzymatic antioxidant activities found at 10 and 20 & mu;M KI concentrations. However, when soybean plants were properly irrigated, KI concentrations greater than 10 & mu;M promoted negative changes in photosynthetic efficiency, as well as in biomass accumulation and partition. In sum, exposure of soybean plants to 10 & mu;M KI improved tolerance to water deficit, and up to this concentration, there is no evidence of phytotoxicity in plants grown under adequate irrigation. (AU)

• Processo FAPESP: 23/00474-4 - Sensores associados à internet das coisas para conexão do ambiente, genética e processamento ao perfil químico e sensorial de cafés especiais
• Beneficiário: Yhan da Silva Mutz
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado