RT Journal Article
T1 AtHB23 participates in the gene regulatory network controlling root branching and reveals differences between secondary and tertiary roots
A1 Perotti, María Florencia
A1 Ribone, Pamela Anahí
A1 Cabello, Julieta Virginia
A1 Ariel, Federico D
A1 Chan, Raquel Lía
K1 Arabidopsis - Aspectos moleculares
AB 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.
PB Wiley
YR 2019
FD 2019-08-23
LK https://hdl.handle.net/10630/44671
UL https://hdl.handle.net/10630/44671
LA eng
NO Perotti, M.F., Ribone, P.A., Cabello, J.V., Ariel, F.D. and Chan, R.L. (2019), AtHB23 participates in the gene regulatory network controlling root branching, and reveals differences between secondary and tertiary roots. Plant J, 100: 1224-1236. https://doi.org/10.1111/tpj.14511
NO https://openpolicyfinder.jisc.ac.uk/id/publication/6981
NO Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
NO Agencia Nacional de Promoción Científica y Tecnológica
NO Universidad Nacional del Litoral
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 3 mar 2026