Scholarlink

<p><i>Abies koreana</i>, an endemic conifer of South Korea, is highly vulnerable to drought stress, posing significant challenges to its survival in high-altitude ecosystems. This study investigated the effects of drought with different severities on the growth, physiology, and molecular responses of <i>A. koreana</i> under natural conditions over 2.5&#xa0;years. Plants exposed to mild drought (60% rainfall exclusion) exhibited a final survival rate of 66%, while those subjected to severe drought (SD, 80% rainfall exclusion) had a survival rate of only 14%. SD caused substantial physiological damage, as evidenced by increases in electrolyte leakage, malondialdehyde contents, and decreased peroxidase activity, alongside reductions in chlorophyll and carotenoid levels, indicating a compromised photosynthetic capacity. Gene expression analyses revealed distinct transcriptional dynamics depending on the duration and severity of stress. <i>AkNAC2</i> and <i>AkGCR2</i> were identified as key candidates for increasing drought tolerance based on their prominent roles in long-term adaptation to SD. These findings enhance our understanding of drought-tolerance mechanisms in <i>A. koreana</i> and provide a foundation for developing effective conservation strategies to mitigate the impacts of climate change on high-altitude forest ecosystems.</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

Ecophysiological and molecular responses of Korean fir (Abies koreana) to various durations and severities of drought stress

  • 期刊论文

  • 发表日期：

    2025年10月24日

查看全文
  • Da Young Lee,
  • Hyeong Cheol Park

摘要

Abies koreana, an endemic conifer of South Korea, is highly vulnerable to drought stress, posing significant challenges to its survival in high-altitude ecosystems. This study investigated the effects of drought with different severities on the growth, physiology, and molecular responses of A. koreana under natural conditions over 2.5 years. Plants exposed to mild drought (60% rainfall exclusion) exhibited a final survival rate of 66%, while those subjected to severe drought (SD, 80% rainfall exclusion) had a survival rate of only 14%. SD caused substantial physiological damage, as evidenced by increases in electrolyte leakage, malondialdehyde contents, and decreased peroxidase activity, alongside reductions in chlorophyll and carotenoid levels, indicating a compromised photosynthetic capacity. Gene expression analyses revealed distinct transcriptional dynamics depending on the duration and severity of stress. AkNAC2 and AkGCR2 were identified as key candidates for increasing drought tolerance based on their prominent roles in long-term adaptation to SD. These findings enhance our understanding of drought-tolerance mechanisms in A. koreana and provide a foundation for developing effective conservation strategies to mitigate the impacts of climate change on high-altitude forest ecosystems.