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Purpose <p>Saline stress limits agricultural production, which is more severe in semiarid regions. The umbu-cajazeira (<i>Spondias sp.</i>) is native to the semiarid region of Brazil. Studies on sources and forms of silicon application in <i>Spondias sp.</i> are unpublished. To evaluate the effect of Si applied through different methods on ecophysiology, biochemistry, osmotic and ionic homeostasis of Umbu-Cajazeira seedlings under salt stress.</p> Methods <p>The experiment was conducted in a plant nursery using a completely randomized design with five treatments: [T1 = ECw 0.5 dS m⁻<sup>1</sup> (control); T2 = ECw 3.5 dS m⁻<sup>1</sup> (salt stress); T3 = salt stress + 3.5&#xa0;g of CaSiO₃ (soil application); T4 = salt stress + 2.2&#xa0;mL L⁻<sup>1</sup> of K₂SiO₃ (foliar application); and T5 = T3 + T4], with eight replications.</p> Results <p>Salt stress negatively affected the growth, gas exchange, and photosynthetic activity of Umbu-Cajazeira seedlings. Si fertilization did not positively affect these traits compared to the salt stress treatment, differing only in the content of chlorophyll a, carotenoids, proline, amino acids, and sodium in leaves. Silicate fertilization was insufficient to mitigate the effects of irrigation water salinity (3.5 dS m<sup>1</sup>) on the photosynthetic activity and growth of Umbu-Cajazeira seedlings.</p> Conclusions <p>Calcium silicate improves osmotic adjustment, amino acid accumulation, and calcium accumulation and reduces sodium content in the leaves of the Umbu-Cajazeira seedlings under salt stress.</p>

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Silicon Application Technology to Mitigate Saline Stress in Umbu-Cajazeira

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • Patrycia Elen Costa Amorim,
  • Vander Mendonça,
  • Hernane Arllen Medeiros Tavares,
  • Agda Malany Forte de Oliveira,
  • Enoch de Souza Ferreira,
  • Matheus Augusto Silva,
  • Paulo Cássio Alves Linhares,
  • Luderlândio de Andrade Silva,
  • Pedro Dantas Fernandes,
  • Romualdo Medeiros Cortez Costa,
  • Tayd Dayvison Custódio Peixoto,
  • Francisco Vanies da Silva Sá

摘要

Purpose

Saline stress limits agricultural production, which is more severe in semiarid regions. The umbu-cajazeira (Spondias sp.) is native to the semiarid region of Brazil. Studies on sources and forms of silicon application in Spondias sp. are unpublished. To evaluate the effect of Si applied through different methods on ecophysiology, biochemistry, osmotic and ionic homeostasis of Umbu-Cajazeira seedlings under salt stress.

Methods

The experiment was conducted in a plant nursery using a completely randomized design with five treatments: [T1 = ECw 0.5 dS m⁻1 (control); T2 = ECw 3.5 dS m⁻1 (salt stress); T3 = salt stress + 3.5 g of CaSiO₃ (soil application); T4 = salt stress + 2.2 mL L⁻1 of K₂SiO₃ (foliar application); and T5 = T3 + T4], with eight replications.

Results

Salt stress negatively affected the growth, gas exchange, and photosynthetic activity of Umbu-Cajazeira seedlings. Si fertilization did not positively affect these traits compared to the salt stress treatment, differing only in the content of chlorophyll a, carotenoids, proline, amino acids, and sodium in leaves. Silicate fertilization was insufficient to mitigate the effects of irrigation water salinity (3.5 dS m1) on the photosynthetic activity and growth of Umbu-Cajazeira seedlings.

Conclusions

Calcium silicate improves osmotic adjustment, amino acid accumulation, and calcium accumulation and reduces sodium content in the leaves of the Umbu-Cajazeira seedlings under salt stress.