Root morphology and kinetics of Zn absorption by roots of common bean influenced by Zn status of the root environment

AUTOR(ES)

Cambraia, Thais Lopes Leal; Ribeiro, Cleberson; Castro, Laís Quintão; Freitas, Robson Dias de; Vergutz, Leonardus; Fontes, Renildes Lúcio Ferreira

FONTE

Rev. Ceres

DATA DE PUBLICAÇÃO

2021-08

RESUMO

ABSTRACT Understanding the kinetics of Zn absorption by roots and its effect on morphology of this organ is relevant for improving crop management, but still poorly studied for common beans. Therefore, an experiment was conducted in a hydroponic system with five initial concentrations of Zn (CZnI): 0.0; 1.0; 4.0; 16.0 and 48.0 µmol L-1. The experiment was installed with plants at V3 stage of development and aliquots of the solution collected over 24 h. The maximum absorption rate (Vmax), Michaelis-Menten constant (Km) and the absorption power (α) increased as a function of CZnI. The minimum concentration of Zn estimated for its absorption (Cmin) was at 0.0028 mg L-1. The influx of Zn (Imax) was higher in higher CZnI, 16,0 µmol L-1. Root length, root volume, root Zn content and Zn absorption efficiency increased with the increase of CZnI. Therefore, the increase of CZnI positively influenced kinetic parameters of root Zn absorption and common bean root morphology, characteristics that favor Zn absorption by roots and improves overall plant nutrition, favoring agronomical biofortification practices for Zn and other nutrients.

Documentos Relacionados

• Kinetics of Sulfate Absorption by Barley Roots1
• Absorption of Chloride by Barley Roots: Kinetics and Selectivity 12
• Kinetics of Phosphorus Absorption by Mycorrhizal and Nonmycorrhizal Tomato Roots 12
• Effect of Ribonuclease on Salt Absorption by Excised Mung Bean Roots1
• Diffusion of tritiated water into roots as influenced by water status of tissue 1