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<p>The use of native plants in urban green spaces is an optimal strategy for mitigating pest and disease outbreaks, preserving the genetic resources of associated flora and fauna, and conserving water.&#xa0;To evaluate the effects of drought stress on the ornamental plant&#xa0;<i>Heteropappus altaicus</i>, a two-year experiment (2021–2022) was conducted using a randomized complete block design with three replications. The treatments included three irrigation regimes:&#xa0;a control (no stress), moderate stress (60 mm cumulative evaporation from a Class A pan), and severe stress (90 mm cumulative evaporation).&#xa0;Morphological and physiological parameters were assessed. The results showed&#xa0;significant differences (P ≤ 0.05) among treatments in branch number, leaf count, fresh weight, and plant height. A significant reduction in dry (22.5%) and fresh (19.3%) weight was observed under severe stress compared to the control, though this did not compromise flower freshness. However, drought stress did not significantly affect flowering duration, flower count, or flower size. Physiological analyses revealed that stress levels significantly influenced proline content, catalase activity, soluble sugar content and chlorophyll&#xa0;<i>a</i>&#xa0;(P ≤ 0.01), while superoxide dismutase activity was significant at P ≤ 0.05. These biochemical adaptations contributed to the plant’s drought tolerance. With&#xa0;a seven-month flowering period, remarkable drought resistance, and high ornamental value,&#xa0;<i>H. altaicus</i>&#xa0;demonstrates strong potential for urban landscaping. This species is recommended for integration into water-efficient urban green spaces.</p>

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Evaluating Heteropappus altaicus for drought-resistant urban green spaces: morpho-physiological adaptations and landscape value

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Saeedeh Sadat Mirzadeh Vaghefi,
  • Anahita Shariat,
  • Pejman Azadi,
  • Ebrahim Sharifi Ashourabadi,
  • Mohammad Alimoradi,
  • Hasan Asgari

摘要

The use of native plants in urban green spaces is an optimal strategy for mitigating pest and disease outbreaks, preserving the genetic resources of associated flora and fauna, and conserving water. To evaluate the effects of drought stress on the ornamental plant Heteropappus altaicus, a two-year experiment (2021–2022) was conducted using a randomized complete block design with three replications. The treatments included three irrigation regimes: a control (no stress), moderate stress (60 mm cumulative evaporation from a Class A pan), and severe stress (90 mm cumulative evaporation). Morphological and physiological parameters were assessed. The results showed significant differences (P ≤ 0.05) among treatments in branch number, leaf count, fresh weight, and plant height. A significant reduction in dry (22.5%) and fresh (19.3%) weight was observed under severe stress compared to the control, though this did not compromise flower freshness. However, drought stress did not significantly affect flowering duration, flower count, or flower size. Physiological analyses revealed that stress levels significantly influenced proline content, catalase activity, soluble sugar content and chlorophyll a (P ≤ 0.01), while superoxide dismutase activity was significant at P ≤ 0.05. These biochemical adaptations contributed to the plant’s drought tolerance. With a seven-month flowering period, remarkable drought resistance, and high ornamental value, H. altaicus demonstrates strong potential for urban landscaping. This species is recommended for integration into water-efficient urban green spaces.