Exogenous hydrogen peroxide inhibits primary root gravitropism by regulating auxin distribution during Arabidopsis seed germination

Plant Physiology and Biochemistry : PPB
Lina ZhouChongying Wang

Abstract

Hydrogen peroxide (H2O2) is the key factor in many physiological and metabolic processes in plants. During seed germination, exogenous H2O2 application influences gravitropism and induces curvature of the primary root in grass pea and pea seedlings. However, it remains unclear whether and how this happens in the model plant Arabidopsis thaliana. In the present study, the effect of exogenous H2O2 on the gravitropic response of primary roots during Arabidopsis seed germination was studied using histology and molecular biology approaches. Appropriate H2O2 treatment not only restrained primary root growth, but also disrupted gravitropism and induced root curvature. Histological staining and molecular analysis demonstrated that exogenous H2O2 correlated with lack of starch-dense amyloplasts in root tip columella cells, which ultimately results in the lack of gravisensing. Detection of calcium ion (Ca2+) by a fluorescent probe showed that Ca2+ distribution changed and intracellular Ca2+ concentration increased in H2O2-treated primary root, which was consistent with alterations in auxin distribution and concentration triggered by H2O2 treatment. Furthermore, the normally polar localization of Pin-formed 1 (PIN1) and PIN2 became unifor...Continue Reading

Citations

Oct 28, 2019·3 Biotech·Jackson KhediaPradeep K Agarwal
Mar 12, 2020·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Diana Sáenz-de la ORamón Gerardo Guevara-Gonzalez
Sep 21, 2018·International Journal of Molecular Sciences·Martin ČernýBřetislav Brzobohatý
Sep 22, 2019·Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine·Loriana Demecsová, Ladislav Tamás
Aug 3, 2021·Plant Physiology and Biochemistry : PPB·Guy Kateta MalangishaMingfang Zhang

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