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<p>Tomato (<i>Solanum lycopersicum</i> L.) cultivar Micro-Tom (MT) is a model plant widely studied for its diverse physiological and genetic traits. Understanding the intricate hormonal mechanisms governing its response to abiotic stresses, such as drought and waterlogging, is crucial to a world harshly affected by climate change. Therefore, we aimed at understanding how other hormones affect drought and waterlogging tolerance in MT, wild type (WT) with no hormonal variation and three variants with a genetic background for reduced cytokinin (−CK, 35S::<i>CYTOKININ OXYDASE 2)</i> and abscisic acid (−ABA, <i>notabilis</i> mutant) and increased gibberellin (+ GA, <i>35S::GA2ox</i>-gibberellin). Thirty days after germination plants were subjected to drought, field capacity, and waterlogging for 7&#xa0;days. Root-stem transition zone cross sections were analysed by microscopy. All treatments showed different responses. All plants showed decreased diameter in xylem vessel elements under field capacity. WT showed decreased epidermis cell area (ECa) under field capacity, decreased average intercellular space area (ISA), and epidermis thickness under drought, and increased epidermis cell wall thickness (Ecwt) under waterlogging. −CK showed increased Ecwt under waterlogging, −ABA showed decreased ECa and average ISA under drought. −CK and −ABA showed anomalies in vascular bundle morphology such as the position of tissues. + GA was unaffected by water stresses, while −ABA was harmed by drought and waterlogging. Increased ISA was found in −ABA under waterlogging, and in 35S::GA2<i>ox</i> under drought, indicating that ABA and GA regulate the initial signalling for tissues formed by programmed cell death such as adventitious root and aerenchyma in tomato at contrasting conditions of water saturation.</p>

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Root-Stem Transition Zone Anatomy Assessment in Hormonal Variants of Tomato, After Growing Under Contrasting Water Saturation

  • 期刊论文

  • 发表日期：

    2025年2月11日

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  • Rodrigo Barbosa Kloss,
  • Felipe Della Torre,
  • Vinícius Politi Duarte,
  • Fabricio José Pereira,
  • Joni Esrom Lima,
  • Marcel Giovanni Costa França

摘要

Tomato (Solanum lycopersicum L.) cultivar Micro-Tom (MT) is a model plant widely studied for its diverse physiological and genetic traits. Understanding the intricate hormonal mechanisms governing its response to abiotic stresses, such as drought and waterlogging, is crucial to a world harshly affected by climate change. Therefore, we aimed at understanding how other hormones affect drought and waterlogging tolerance in MT, wild type (WT) with no hormonal variation and three variants with a genetic background for reduced cytokinin (−CK, 35S::CYTOKININ OXYDASE 2) and abscisic acid (−ABA, notabilis mutant) and increased gibberellin (+ GA, 35S::GA2ox-gibberellin). Thirty days after germination plants were subjected to drought, field capacity, and waterlogging for 7 days. Root-stem transition zone cross sections were analysed by microscopy. All treatments showed different responses. All plants showed decreased diameter in xylem vessel elements under field capacity. WT showed decreased epidermis cell area (ECa) under field capacity, decreased average intercellular space area (ISA), and epidermis thickness under drought, and increased epidermis cell wall thickness (Ecwt) under waterlogging. −CK showed increased Ecwt under waterlogging, −ABA showed decreased ECa and average ISA under drought. −CK and −ABA showed anomalies in vascular bundle morphology such as the position of tissues. + GA was unaffected by water stresses, while −ABA was harmed by drought and waterlogging. Increased ISA was found in −ABA under waterlogging, and in 35S::GA2ox under drought, indicating that ABA and GA regulate the initial signalling for tissues formed by programmed cell death such as adventitious root and aerenchyma in tomato at contrasting conditions of water saturation.