Scholarlink

<p>Urban air pollution poses a persistent threat to tree health, yet species-specific stomatal responses and adaptive strategies under chronic pollution stress remain poorly understood. This study investigated stomatal morphometric and functional traits of nine common urban tree species across two contrasting sites in Dhaka city to elucidate pollution-induced structural and physiological adjustments. Stomatal length, breadth, area, perimeter, density, and pore index, along with the percentages of open and closed stomata, were quantified by using ImageJ software and analyzed using two-way ANOVA, Pearson correlation, and principal component analysis (PCA). Most species exhibited reductions in stomatal size traits under polluted conditions, indicating pollution-induced stomatal miniaturization. However, responses of stomatal density, SPI, and stomatal opening–closure dynamics were strongly species-specific. Several species, including <i>Polyalthia longifolia</i>, <i>Swietenia mahagoni</i>, <i>Terminalia catappa</i>, and <i>Mimusops elengi,</i> maintained stable stomatal morphology and increased stomatal openness, reflecting higher tolerance to pollution stress. In contrast, <i>Ficus benghalensis</i>, <i>Ficus religiosa</i>, and <i>Terminalia arjuna</i> showed pronounced stomatal closure and reduced pore characteristics, indicating stress-avoidance strategies and greater sensitivity. Correlation and PCA revealed conserved coordination among stomatal size traits but enhanced trade-offs between stomatal size, density, and functional regulation under polluted conditions. These findings provide mechanistic insight into stomatal adaptation under urban air pollution and offer a scientific basis for species selection in urban greening and air-quality management programs.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Integrated morphometric and functional stomatal responses of urban tree species to chronic air pollution

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月4日

查看全文
  • Md. Abul Kashem,
  • Mohammad Ataur Rahman,
  • Sirajum Munira Hussaini,
  • Mohammad Zabed Hossain

摘要

Urban air pollution poses a persistent threat to tree health, yet species-specific stomatal responses and adaptive strategies under chronic pollution stress remain poorly understood. This study investigated stomatal morphometric and functional traits of nine common urban tree species across two contrasting sites in Dhaka city to elucidate pollution-induced structural and physiological adjustments. Stomatal length, breadth, area, perimeter, density, and pore index, along with the percentages of open and closed stomata, were quantified by using ImageJ software and analyzed using two-way ANOVA, Pearson correlation, and principal component analysis (PCA). Most species exhibited reductions in stomatal size traits under polluted conditions, indicating pollution-induced stomatal miniaturization. However, responses of stomatal density, SPI, and stomatal opening–closure dynamics were strongly species-specific. Several species, including Polyalthia longifolia, Swietenia mahagoni, Terminalia catappa, and Mimusops elengi, maintained stable stomatal morphology and increased stomatal openness, reflecting higher tolerance to pollution stress. In contrast, Ficus benghalensis, Ficus religiosa, and Terminalia arjuna showed pronounced stomatal closure and reduced pore characteristics, indicating stress-avoidance strategies and greater sensitivity. Correlation and PCA revealed conserved coordination among stomatal size traits but enhanced trade-offs between stomatal size, density, and functional regulation under polluted conditions. These findings provide mechanistic insight into stomatal adaptation under urban air pollution and offer a scientific basis for species selection in urban greening and air-quality management programs.