Artículo
AtHB23 participates in the gene regulatory network controlling root branching and reveals differences between secondary and tertiary roots
Perotti, María Florencia
; Ribone, Pamela Anahí
; Cabello, Julieta Virginia
; Ariel, Federico Damian
; Chan, Raquel Lia
Fecha de publicación:
08/2019
Editorial:
Wiley Blackwell Publishing, Inc
Revista:
Plant Journal
ISSN:
0960-7412
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
In Arabidopsis, lateral root (LR) development is mainly controlled by several known auxin-regulated transcription factors (TFs). Here, we show that AtHB23 (a homeodomain-leucine zipper I TF) participates in this intricate network. Our study of the expression pattern of AtHB23 revealed that it is transcriptionally activated in the early stages of secondary LR primordium (LRP). We found that AtHB23 directly limits the expression of LBD16, a key factor in LR initiation, and also directly induces the auxin transporter gene LAX3.We propose that this HD-Zip I mediates the regulation of LAX3 by ARF7/19. Furthermore, AtHB23 plays distinct roles during the formation of secondary and tertiary roots, exhibiting differential expression patterns. ATHB23 is expressed throughout the tertiary root primordium, whereas it is restricted to early stages in secondary primordia, likely later repressing LBD16 in tertiary LR development and further inhibiting root emergence.Our results suggest that different genetic programs govern the formation of LRP from the main or secondary roots, thereby shaping the global dynamic architecture of the root system.
Palabras clave:
ARF7/19
,
ATHB23
,
LATERAL ROOTS
,
LAX3
,
LBD16
,
TERTIARY ROOTS
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Articulos(IAL)
Articulos de INSTITUTO DE AGROBIOTECNOLOGIA DEL LITORAL
Articulos de INSTITUTO DE AGROBIOTECNOLOGIA DEL LITORAL
Citación
Perotti, María Florencia; Ribone, Pamela Anahí; Cabello, Julieta Virginia; Ariel, Federico Damian; Chan, Raquel Lia; AtHB23 participates in the gene regulatory network controlling root branching and reveals differences between secondary and tertiary roots; Wiley Blackwell Publishing, Inc; Plant Journal; 100; 6; 8-2019; 1224-1236
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