Title:	Auxin transport inhibition triggers pedicel expansion and alters abscission zone dynamics in tomato fruit.
Authors:	RIBOLDI, L. B. ROSSI, M. L. GRANER, E. M. ALMEIDA, M. de CASTRO, P. R. de C. e FREITAS, S. T. de
Affiliation:	LUCAS BAIOCHI RIBOLDI, UNIVERSITY OF SÃO PAULO MÔNICA LANZONI ROSSI, UNIVERSITY OF SÃO PAULO ERIKA MENDES GRANER, UNIVERSITY OF SÃO PAULO MARCÍLIO DE ALMEIDA, UNIVERSITY OF SÃO PAULO PAULO ROBERTO DE CAMARGO E CASTRO, UNIVERSITY OF SÃO PAULO SERGIO TONETTO DE FREITAS, CPATSA.
Date Issued:	2025
Citation:	Brazilian Journal of Botany, v. 48, July, 2025.
Description:	Auxin transport plays a key role in plant growth and organ abscission by regulating cell division and tissue diferentiation. In this study, we investigated the efects of 2,3,5-triiodobenzoic acid (TIBA), an auxin transport inhibitor, on tomato pedicel development, with a focus on the abscission zone. Using the model tomato ‘Micro-Tom’, TIBA treatment led to marked pedicel thickening due to increased periclinal cell division in cortical and procambial tissues. Histological analysis also revealed localized programmed cell death in the distal abscission zone, indicating a disruption of auxin gradients and possible activation of ethylene signaling pathways. These results show that auxin transport inhibition promotes both hyperplastic growth and cell separation processes, underscoring the complex hormonal crosstalk controlling abscission. TIBA’s efects on pedicel anatomy suggest potential applications in delaying fruit drop and extending harvest windows, although further research is needed to evaluate impacts on tomato fruit quality and plant performance, in commercial varieties. Keywords Auxin transport · TIBA · Abscission zone · Programmed cell death · Tomato pedicel · Ethylene
Thesagro:	Tomate
DOI:	https://doi.org/10.1007/s40415-025-01102-6
Notes:	On-line.
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPATSA)