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<p>Garlic (<i>Allium sativum</i>) cloves intended for planting represent a significant portion of cultivation costs and play a crucial role in productivity. Therefore, the application of biostimulants to enhance garlic emergence is an effective alternative. Indole-3-ethanol (TOL), a metabolite derived from the indole-3-acetic acid (IAA) metabolic pathway, is a promising candidate for use as a biostimulant molecule. TOL was applied to garlic bulbs to mitigate the effects of vernalization techniques, which are essential for cultivation in tropical climates, aiming to accelerate sprouting and improve plant adaptation in field conditions. In this study, garlic bulbs were treated with increasing concentrations of TOL (0, 3, 8, 12, and 16 µM), and both in vitro and field experiments were conducted during the 2021 and 2022 crop seasons. Results revealed that TOL concentrations between 8 and 12 µM significantly promoted early plant development, maintaining an optimal balance between shoot and root growth. Furthermore, root architecture was notably improved in TOL-treated plants, which exhibited greater volume and an increased number of lateral roots. Conversely, higher concentrations, such as 16 µM, had a detrimental effect on plant development. Metabolomic analysis showed that TOL-treated plants had higher concentrations of metabolites associated with amino acid biosynthesis and bioenergetic pathways. These biochemical changes contributed to the formation of larger bulbs with higher commercial value.</p>

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Biostimulant Action of Tryptophol in Garlic Cloves Planting: Metabolic and Productivity Enhancements

  • 期刊论文

  • 发表日期：

    2025年6月18日

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  • V. G. Nasser,
  • G. C. F. Nasser,
  • J. A. Ferreira,
  • W. R. Macedo,
  • F. G. Pinto,
  • G. H. Silva

摘要

Garlic (Allium sativum) cloves intended for planting represent a significant portion of cultivation costs and play a crucial role in productivity. Therefore, the application of biostimulants to enhance garlic emergence is an effective alternative. Indole-3-ethanol (TOL), a metabolite derived from the indole-3-acetic acid (IAA) metabolic pathway, is a promising candidate for use as a biostimulant molecule. TOL was applied to garlic bulbs to mitigate the effects of vernalization techniques, which are essential for cultivation in tropical climates, aiming to accelerate sprouting and improve plant adaptation in field conditions. In this study, garlic bulbs were treated with increasing concentrations of TOL (0, 3, 8, 12, and 16 µM), and both in vitro and field experiments were conducted during the 2021 and 2022 crop seasons. Results revealed that TOL concentrations between 8 and 12 µM significantly promoted early plant development, maintaining an optimal balance between shoot and root growth. Furthermore, root architecture was notably improved in TOL-treated plants, which exhibited greater volume and an increased number of lateral roots. Conversely, higher concentrations, such as 16 µM, had a detrimental effect on plant development. Metabolomic analysis showed that TOL-treated plants had higher concentrations of metabolites associated with amino acid biosynthesis and bioenergetic pathways. These biochemical changes contributed to the formation of larger bulbs with higher commercial value.