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<p>Two Korean endemic <i>Hosta</i> species, <i>H. minor</i> and <i>H. yingeri</i>, exhibit distinct geographical and ecological niches: <i>H. minor</i> occurs widely across the mainland, whereas <i>H. yingeri</i> is restricted to humid, fog-prone coastal islands. This study aimed to compare their heat stress responses, with the ultimate goal of informing their horticultural applicability. The plants were exposed to a heat-stress treatment (35/25°C, HST) or a control (25/15°C, CK) for five weeks to evaluate interspecific differences in growth, stomatal behavior, and photophysiological performance. Heat stress reduced leaf number, net photosynthetic rate (P<sub>n</sub>), chlorophyll and carotenoid contents, and F<sub>v</sub>/F<sub>m</sub> in both species. However, these declines were consistently more pronounced in <i>H. minor</i> than in <i>H. yingeri</i>. The two species also displayed contrasting stomatal adjustments, with <i>H. minor</i> decreasing stomatal pore area, whereas <i>H. yingeri</i> increased it under HST. OJIP kinetics further highlighted species-specific responses: <i>H. minor</i> showed elevated chlorophyll fluorescence intensity up to the I phase, indicative of enhanced excitation pressure on PSII, while <i>H. yingeri</i> showed an increase in fluorescence intensity after the O phase, suggesting better preservation of PSII reaction centers. <i>H. minor</i> exhibited greater sensitivity to high temperature than <i>H. yingeri</i>, highlighting interspecific variation in heat tolerance relevant to horticultural selection.</p>

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Comparative analysis of heat stress responses in the Korean endemic Hosta minor and H. yingeri

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Bo Kyeong Kang,
  • Wan Soon Kim

摘要

Two Korean endemic Hosta species, H. minor and H. yingeri, exhibit distinct geographical and ecological niches: H. minor occurs widely across the mainland, whereas H. yingeri is restricted to humid, fog-prone coastal islands. This study aimed to compare their heat stress responses, with the ultimate goal of informing their horticultural applicability. The plants were exposed to a heat-stress treatment (35/25°C, HST) or a control (25/15°C, CK) for five weeks to evaluate interspecific differences in growth, stomatal behavior, and photophysiological performance. Heat stress reduced leaf number, net photosynthetic rate (Pn), chlorophyll and carotenoid contents, and Fv/Fm in both species. However, these declines were consistently more pronounced in H. minor than in H. yingeri. The two species also displayed contrasting stomatal adjustments, with H. minor decreasing stomatal pore area, whereas H. yingeri increased it under HST. OJIP kinetics further highlighted species-specific responses: H. minor showed elevated chlorophyll fluorescence intensity up to the I phase, indicative of enhanced excitation pressure on PSII, while H. yingeri showed an increase in fluorescence intensity after the O phase, suggesting better preservation of PSII reaction centers. H. minor exhibited greater sensitivity to high temperature than H. yingeri, highlighting interspecific variation in heat tolerance relevant to horticultural selection.