Artículo
Nitrate Induction of Primary Root Growth Requires Cytokinin Signaling in Arabidopsis thaliana
Naulin, Pamela A; Armijo, Grace; Vega, Andrea; Tamayo, Karem P; Gras, Diana Ester
; de la Cruz, Javiera; Gutiérrez, Rodrigo A
Fecha de publicación:
11/2019
Editorial:
Oxford University Press
Revista:
Plant And Cell Physiology
ISSN:
0032-0781
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
Nitrate can act as a potent signal to control growth and development in plants. Here we show nitrate is able to stimulate primary root growth via increased meristem activity and cytokinin signaling. Cytokinin perception and biosynthesis mutants displayed shorter roots as compared to wild type plants when grown with nitrate as the only nitrogen source. Histological analysis of the root tip revealed decreased cell division and elongation in the cytokinin receptor double mutant ahk2/ahk4 as compared to wild-type plants under a sufficient nitrate regime. Interestingly, a nitrate-dependent root growth arrest was observed between days 5 and 6 after sowing. Wild-type plants were able to recover from this growth arrest while cytokinin signaling or biosynthesis mutants were not. Transcriptome analysis revealed significant changes in gene expression after, but not before this transition in contrasting genotypes and nitrate regimes. We identified genes involved in both cell division and elongation as potentially important for primary root growth in response to nitrate. Our results provide evidence linking nitrate and cytokinin signaling for the control of primary root growth in Arabidopsis thaliana.
Palabras clave:
PRIMARY ROOT
,
NITRATE
,
CYTOKININ S
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Articulos(IAL)
Articulos de INSTITUTO DE AGROBIOTECNOLOGIA DEL LITORAL
Articulos de INSTITUTO DE AGROBIOTECNOLOGIA DEL LITORAL
Citación
Naulin, Pamela A; Armijo, Grace; Vega, Andrea; Tamayo, Karem P; Gras, Diana Ester; et al.; Nitrate Induction of Primary Root Growth Requires Cytokinin Signaling in Arabidopsis thaliana; Oxford University Press; Plant And Cell Physiology; 61; 2; 11-2019; 342–352
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