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<p>Auxin transport plays a key role in plant growth and organ abscission by regulating cell division and tissue differentiation. In this study, we investigated the effects 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 effects 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.</p>

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Auxin transport inhibition triggers pedicel expansion and alters abscission zone dynamics in tomato fruit

  • 期刊论文

  • 发表日期：

    2025年7月22日

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  • Lucas Baiochi Riboldi,
  • Mônica Lanzoni Rossi,
  • Erika Mendes Graner,
  • Marcílio de Almeida,
  • Paulo Roberto de Camargo e Castro,
  • Sérgio Tonetto de Freitas

摘要

Auxin transport plays a key role in plant growth and organ abscission by regulating cell division and tissue differentiation. In this study, we investigated the effects 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 effects 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.