Artículo
Azospirillum brasilense Az39 restricts cadmium entrance into wheat plants and mitigates cadmium stress
Fecha de publicación:
11/2021
Editorial:
Elsevier Ireland
Revista:
Plant Science
ISSN:
0168-9452
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
In this work, we tested if inoculation with the plant growth-promoting rhizobacteria Azospirillum brasilense strain Az39 alleviates Cd2+ stress in wheat seedlings grown under controlled conditions. Growth, total N, N-related metabolites/enzymes, and oxidative stress parameters were measured. Additionally, the usefulness of a real-time PCR protocol to screen the preferred colonization site of the introduced microorganism was evaluated. Inoculated plants demonstrated mitigation of cadmium-induced adverse effects on plant growth and less reactive oxygen species accumulation in their roots by the end of the experiment, 28 days after sowing. Cd addition resulted in lower NO3− content in the leaves and higher NO3− content in the roots, and a significant rise in NH4+ concentration in both organs in uninoculated plants; in inoculated plants, NH4+ content in the roots did not vary. A. brasilense Az39 enhanced NO levels in wheat root tips, and more adventitious roots and root hairs were observed in inoculated plants. Despite having a more developed root system, inoculated plants showed lower Cd levels in their roots compared to non-inoculated plants. Inoculation with this PGPR favored ion homeostasis in the roots of metal-exposed plants, decreasing Cd/Fe ratio. We corroborated A. brasilense Az39 preference for wheat exorhizosphere using a real-time PCR-based method targeting the nifA gene.
Palabras clave:
AZOSPIRILLUM
,
CADMIUM
,
IRON
,
OXIDATIVE STRESS
,
WHEAT
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Articulos(IQUIFIB)
Articulos de INST.DE QUIMICA Y FISICO-QUIMICA BIOLOGICAS "PROF. ALEJANDRO C. PALADINI"
Articulos de INST.DE QUIMICA Y FISICO-QUIMICA BIOLOGICAS "PROF. ALEJANDRO C. PALADINI"
Citación
Vazquez, Analia; Zawoznik, Myriam Sara; Benavides, Maria Patricia; Groppa, María Daniela; Azospirillum brasilense Az39 restricts cadmium entrance into wheat plants and mitigates cadmium stress; Elsevier Ireland; Plant Science; 312; 11-2021; 1-10
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