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<p>Venation patterning, orchestrated by auxin, plays a critical role in the evolution of vascular functions, resulting in enhanced hydraulic conductance and photosynthetic rates. Recent studies questioned the well-discussed established protagonism of polar auxin transport in venation development, suggesting that vascular differentiation is governed by homeostasis among auxin transport, biosynthesis, and signaling. Even so, many aspects of leaf vein formation and the auxin role remain unclear. Here, we are highlighting the auxin transport role—through PIN1 efflux carrier—in this process to propose a regulation point aiming at drought resistance. We briefly summarize the auxin role in leaf venation to suggest that the development of venation entails a critical interplay between auxin and responses to drought. Moreover, we explore the relationship between venation density and drought, considering the potential utilization of auxin transporters to modulate high auxin zones in vascular differentiation to enhance hydraulic conductance and improve tolerance to cavitation. We believe that manipulating vein development plasticity by regulating the PIN1 gene could be a viable strategy for helping plants cope with drought. Elucidating this may be the focus of future research.</p>

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Drought tolerance: a perspective about leaf venation and the role of auxin

  • 期刊论文

  • 发表日期：

    2025年1月22日

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  • Mariana Rocha de Carvalho,
  • Elisa Monteze Bicalho,
  • Eduardo Gusmão Pereira,
  • Luiz Roberto Guimarães Guilherme,
  • Paulo Eduardo Ribeiro Marchiori

摘要

Venation patterning, orchestrated by auxin, plays a critical role in the evolution of vascular functions, resulting in enhanced hydraulic conductance and photosynthetic rates. Recent studies questioned the well-discussed established protagonism of polar auxin transport in venation development, suggesting that vascular differentiation is governed by homeostasis among auxin transport, biosynthesis, and signaling. Even so, many aspects of leaf vein formation and the auxin role remain unclear. Here, we are highlighting the auxin transport role—through PIN1 efflux carrier—in this process to propose a regulation point aiming at drought resistance. We briefly summarize the auxin role in leaf venation to suggest that the development of venation entails a critical interplay between auxin and responses to drought. Moreover, we explore the relationship between venation density and drought, considering the potential utilization of auxin transporters to modulate high auxin zones in vascular differentiation to enhance hydraulic conductance and improve tolerance to cavitation. We believe that manipulating vein development plasticity by regulating the PIN1 gene could be a viable strategy for helping plants cope with drought. Elucidating this may be the focus of future research.