Scholarlink

<p>Accessing the thermal niche and thermal safety margin (TSM) for seed germination enables the prediction of vulnerability to climate warming during this critical phase of recruitment. Here, using seeds sampled from a hybrid zone at a savanna/forest ecotone, we evaluated the vulnerability of germination to high temperatures in the parental species, <i>Dimorphandra mollis</i> and <i>D. exaltata</i>, and the F1 hybrid, identified as another species<i>, D. wilsonii</i>. Seeds were germinated in a wide range of temperatures to determine the cardinal temperatures, thermal niche, supra optimum temperatures that reduce germination by 15% (T<sub>15</sub>) and 50% (T<sub>50</sub>), and TSM. Considering the temperature increase under four scenarios of climate change, the TSMs, defined as the difference between T<sub>15</sub> (TSM<sub>15</sub>) or T<sub>50</sub> (TSM<sub>50</sub>), and the germination temperature, were determined. <i>D. exaltata</i>, with restricted distribution in the Atlantic Forest, had a broader thermal niche and TSM than <i>D. mollis</i>, widely distributed in the Cerrado. The results indicate that habitat characteristics were the primary determinants of the differences in thermal niche among <i>Dimorphandra</i> species. Despite differences in thermal niche and TSM between the species, our data suggest that germination of both will not be impaired by increases in temperature under the warming scenarios. F1 hybrid presented intermediate values or similar to one of the parents for most of the cardinal temperatures. However, seeds of F1 hybrid showed higher T<sub>15</sub> and wider TSM<sub>15</sub> than parentals, indicating heterosis for these traits and suggesting that the hybrids would be more resilient to temperature increases in germination than the parental species.</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

Thermal niche and climate warming vulnerability for seed germination in Dimorphandra hybrid zone

  • 期刊论文

  • 发表日期：

    2025年10月1日

查看全文
  • Aldineia Buss,
  • André Carneiro Muniz,
  • Tiago Vilas-Boas,
  • Alexandre Aparecido Duarte,
  • Maria Bernadete Lovato,
  • José Pires Lemos-Filho

摘要

Accessing the thermal niche and thermal safety margin (TSM) for seed germination enables the prediction of vulnerability to climate warming during this critical phase of recruitment. Here, using seeds sampled from a hybrid zone at a savanna/forest ecotone, we evaluated the vulnerability of germination to high temperatures in the parental species, Dimorphandra mollis and D. exaltata, and the F1 hybrid, identified as another species, D. wilsonii. Seeds were germinated in a wide range of temperatures to determine the cardinal temperatures, thermal niche, supra optimum temperatures that reduce germination by 15% (T15) and 50% (T50), and TSM. Considering the temperature increase under four scenarios of climate change, the TSMs, defined as the difference between T15 (TSM15) or T50 (TSM50), and the germination temperature, were determined. D. exaltata, with restricted distribution in the Atlantic Forest, had a broader thermal niche and TSM than D. mollis, widely distributed in the Cerrado. The results indicate that habitat characteristics were the primary determinants of the differences in thermal niche among Dimorphandra species. Despite differences in thermal niche and TSM between the species, our data suggest that germination of both will not be impaired by increases in temperature under the warming scenarios. F1 hybrid presented intermediate values or similar to one of the parents for most of the cardinal temperatures. However, seeds of F1 hybrid showed higher T15 and wider TSM15 than parentals, indicating heterosis for these traits and suggesting that the hybrids would be more resilient to temperature increases in germination than the parental species.