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<p>Water deficit and heat have been considered the main abiotic stresses to which forests are exposed due to global warming. Since seedling establishment is a vulnerable developmental transition that plays a critical role in forest dynamics, we carried out in vitro experiments to reveal how seedlings of the Caatinga native species <i>Pityrocarpa moniliformis</i> (Benth) Luckow &amp; R.W. Jobson respond to water deficit and heat with respect to growth, water status, reserve mobilization, hydrolase activity, and metabolite partitioning, including non-structural carbohydrate availability. In the seedlings exposed to osmotic stress induced by mannitol, restricted growth was not accompanied by alterations in water status, but it was associated with delayed mobilization of starch and storage proteins in the cotyledons and decreased availability of non-structural carbohydrates in the root. By contrast, high temperature retarded the establishment of the photosynthetic apparatus and compromised the activity of hydrolytic enzymes, even though reserve mobilization has not been changed in the cotyledons. Considering the absence of mortality, it is suggested that <i>P. moniliformis</i> may be tolerant to osmotic and heat stress during seedling establishment. The maintenance of water status seems crucial to water deficit tolerance, while the availability of non-structural carbohydrates may play a role in heat stress tolerance.</p>

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Water deficit and heat differentially affect seedling growth and reserve mobilization in the Caatinga pioneer species Pityrocarpa moniliformis

  • 期刊论文

  • 发表日期：

    2025年6月20日

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  • Hanieri Alves-da-Silva,
  • Danilo Flademir Alves-de-Oliveira,
  • Ana Paula Avelino,
  • Lucas Jean Nunes,
  • Thiago Barros-Galvão,
  • Eduardo Luiz Voigt

摘要

Water deficit and heat have been considered the main abiotic stresses to which forests are exposed due to global warming. Since seedling establishment is a vulnerable developmental transition that plays a critical role in forest dynamics, we carried out in vitro experiments to reveal how seedlings of the Caatinga native species Pityrocarpa moniliformis (Benth) Luckow & R.W. Jobson respond to water deficit and heat with respect to growth, water status, reserve mobilization, hydrolase activity, and metabolite partitioning, including non-structural carbohydrate availability. In the seedlings exposed to osmotic stress induced by mannitol, restricted growth was not accompanied by alterations in water status, but it was associated with delayed mobilization of starch and storage proteins in the cotyledons and decreased availability of non-structural carbohydrates in the root. By contrast, high temperature retarded the establishment of the photosynthetic apparatus and compromised the activity of hydrolytic enzymes, even though reserve mobilization has not been changed in the cotyledons. Considering the absence of mortality, it is suggested that P. moniliformis may be tolerant to osmotic and heat stress during seedling establishment. The maintenance of water status seems crucial to water deficit tolerance, while the availability of non-structural carbohydrates may play a role in heat stress tolerance.