Auxin-jasmonate crosstalk in Oryza sativa L. root system formation after cadmium and/or arsenic exposure

• DOI: 10.1016/j.envexpbot.2019.05.013
• Publication Date: 2019-05-29T11:14:57Z
• Authors: Marilena Ronzan; Diego Piacentini; Laura Fattorini; Della Rovere Fede...; Emilia Caboni; Elisabeth Eiche; Jörg Ziegler; Bettina Hause; Michael Riemann; Camilla Betti; Maria Maddalena A...; Giuseppina Falasca
• Keywords: Jasmonic acid; Jasmonate; Wild type; Methyl jasmonate; Lateral root

Soil pollutants may affect root growth through interactions among phytohormones like auxin and jasmonates. Rice is frequently grown in paddy fields contaminated by cadmium arsenic, but the effects of these on jasmonates/auxin crosstalk during adventitious lateral roots formation are widely unknown. Therefore, seedlings Oryza sativa cv. Nihonmasari jasmonate-biosynthetic mutant coleoptile photomorphogenesis2 were exposed to and/or jasmonic acid methyl ester, then analysed morphological, histochemical, biochemical molecular approaches. In both genotypes, arsenic accumulated more than shoots. roots, levels twice higher levels, either when was applied alone, or combined with cadmium. Pollutants reduced density wild -type every treatment condition, ester increased it each pollutant. Interestingly, exposure did not change mutant. The transcript OsASA2 OsYUCCA2, biosynthetic genes, wild-type alone. Auxin (indole-3-acetic acid) transiently Arsenic cadmium, induced fluctuations bioactive jasmonate contents distribution evaluated OsDR5::GUS added arsenic. DR5::GUS signal ester. Lipid peroxidation, as malondialdehyde wild-type, particularly As presence, genotypes. Altogether, results show that an auxin/jasmonate interaction affects rice system development presence even if exogenous only slightly mitigates toxicity.