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<p>Climate change may affect plant life cycles, particularly seed germination, a critical phase in plant establishment and survival. We investigated the role of temperature and light in germination rate and velocity to assess how rising temperatures could affect 18 native prairie plant species. A growth chamber experiment was conducted using three temperatures (normal 19 ºC, moderate 22 ºC, extreme 25 ºC) and two light (darkness, light–dark cycle) scenarios. Germination response was species specific; some species benefited from increased temperature and light, and others showed temperature sensitivity or light dependence. Moderate temperatures enhanced germination in <i>Anemone virginiana</i>, <i>Coreopsis tinctoria</i> and <i>Gentiana affinis</i>; extreme temperatures favoured <i>Asclepias speciosa</i>. <i>Helianthus pauciflorus</i> declined sharply under elevated temperatures. Light availability increased germination in <i>Asclepias speciosa</i>, <i>Coreopsis tinctoria</i>, <i>Gentiana affinis</i> and <i>Sphenopholis obtusata</i>. Modified Timson’s Index (germination velocity) was higher for <i>Asclepias speciosa</i>, <i>Dalea purpurea</i>, <i>Liatris ligulistylis</i>, <i>Houstonia longifolia</i> and <i>Gentiana affinis</i> at elevated temperatures and light conditions. <i>Houstonia longifolia</i>, <i>Dieteria canescens, Dalea candida</i> and <i>Dalea purpurea</i> maintained consistent germination regardless of these factors; <i>Mirabilis linearis</i>, <i>Penstemon fruticosus</i> and <i>Lysimachia hybrid</i> had little to no germination. These findings provide insights for selecting plant species for revegetation and habitat restoration under changing climate conditions.</p>

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Role of warming temperature and light on germination of 18 native plant species for land reclamation in Canada

  • 期刊论文

  • 发表日期：

    2026年1月27日

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  • Amalesh Dhar,
  • Henian Guo,
  • Sarah R Wilkinson,
  • M. Anne Naeth

摘要

Climate change may affect plant life cycles, particularly seed germination, a critical phase in plant establishment and survival. We investigated the role of temperature and light in germination rate and velocity to assess how rising temperatures could affect 18 native prairie plant species. A growth chamber experiment was conducted using three temperatures (normal 19 ºC, moderate 22 ºC, extreme 25 ºC) and two light (darkness, light–dark cycle) scenarios. Germination response was species specific; some species benefited from increased temperature and light, and others showed temperature sensitivity or light dependence. Moderate temperatures enhanced germination in Anemone virginiana, Coreopsis tinctoria and Gentiana affinis; extreme temperatures favoured Asclepias speciosa. Helianthus pauciflorus declined sharply under elevated temperatures. Light availability increased germination in Asclepias speciosa, Coreopsis tinctoria, Gentiana affinis and Sphenopholis obtusata. Modified Timson’s Index (germination velocity) was higher for Asclepias speciosa, Dalea purpurea, Liatris ligulistylis, Houstonia longifolia and Gentiana affinis at elevated temperatures and light conditions. Houstonia longifolia, Dieteria canescens, Dalea candida and Dalea purpurea maintained consistent germination regardless of these factors; Mirabilis linearis, Penstemon fruticosus and Lysimachia hybrid had little to no germination. These findings provide insights for selecting plant species for revegetation and habitat restoration under changing climate conditions.