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<p>Comparative analyzes of the xylem transcriptomes from <i>Eucalyptus grandis</i> and <i>E. globulus</i> allowed us to identify a gene sequence putatively encoding an enzyme similar to xyloglucan endotransglucosylase/hydrolase (XTH). XTHs are a family of enzymes involved in plant cell wall modification, impacting cell expansion and growth. Besides cell wall structure remodeling induced by XTHs, the activity of this class of enzymes was also related to plant responses to stress conditions. In this work, we show that in <i>Eucalyptus</i>, <i>EucXTH</i> expression is induced in response to stress conditions such as those promoted by injury, salinity and cold, indicating its involvement in adaptive responses to abiotic stress. Additionally, we demonstrate that <i>Nicotiana tabacum</i> plants overexpressing <i>EucXTH</i> present changes in secondary xylem differentiation, increased mechanical strength, enhanced net phohtosynthesis associated with stomatal regulation and increased water use efficiencies. The enhanced tolerance to salt stress was evidenced by increased biomass accumulation. These findings demonstrate the potential of the <i>EucXTH</i> gene to improve plant tolerance to environmental challenges.</p>

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Expression of an Eucalyptus grandis Xyloglucan endoglycosylase gene in Nicotiana tabacum confers tolerance to abiotic stress

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月23日

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  • Elza Thaynara Cardoso de Menezes Assis,
  • Maria Teresa Aguilar Quisbert,
  • Dandara Bispo Oliveira,
  • Aurizangela Oliveira de Sousa,
  • Giancarlo Pasquali,
  • Delmira da Costa Silva,
  • Carlos Priminho Pirovani,
  • Martielly Santana dos Santos,
  • Fátima Cerqueira Alvim

摘要

Comparative analyzes of the xylem transcriptomes from Eucalyptus grandis and E. globulus allowed us to identify a gene sequence putatively encoding an enzyme similar to xyloglucan endotransglucosylase/hydrolase (XTH). XTHs are a family of enzymes involved in plant cell wall modification, impacting cell expansion and growth. Besides cell wall structure remodeling induced by XTHs, the activity of this class of enzymes was also related to plant responses to stress conditions. In this work, we show that in Eucalyptus, EucXTH expression is induced in response to stress conditions such as those promoted by injury, salinity and cold, indicating its involvement in adaptive responses to abiotic stress. Additionally, we demonstrate that Nicotiana tabacum plants overexpressing EucXTH present changes in secondary xylem differentiation, increased mechanical strength, enhanced net phohtosynthesis associated with stomatal regulation and increased water use efficiencies. The enhanced tolerance to salt stress was evidenced by increased biomass accumulation. These findings demonstrate the potential of the EucXTH gene to improve plant tolerance to environmental challenges.