Scholarlink

<p>High temperature (HT) is a critical abiotic factor that restricts plant growth and development. The role of abscisic acid (ABA) in stress tolerance is well established, and ABA 8’-hydroxylase (ABA8ox), a key enzyme in ABA degradation, is crucial for plant responses to abiotic stress. In this study, a <i>CsABA8ox1</i>-deficient mutant, yf-343, and its wild-type counterpart, BY, were subjected to continuous HT treatment to assess phenotypic, physiological, and transcriptomic changes. Under HT, ABA accumulation increased in BY and yf-343, with significantly higher levels in the yf-343 mutant. Exogenous ABA application accelerated leaf yellowing in BY and triggered pronounced leaf senescence and cell death in yf-343. HT treatment also increased the activities of superoxide dismutase and peroxidase, elevated ABA and malondialdehyde content, and simultaneously inhibited catalase activity and photosynthetic rate. Comparative RNA sequencing (RNA-seq) revealed that genes associated with plant hormone signaling, secondary metabolite biosynthesis, starch and sucrose metabolism, phenylalanine metabolism, and the mitogen-activated protein kinase signaling pathway were differentially expressed between yf-343 and BY under 42&#xa0;°C HT treatment. Among these, two genes, <i>heat shock proteins 70</i> (Cs<i>HSP70</i>) and <i>wall-associated receptor kinase 2</i> (<i>CsWAKL2</i>), were validated through virus-induced gene silencing. Knockdown of Cs<i>HSP70</i> and <i>CsWAKL2</i> enhanced susceptibility to HT, confirming the reliability and significance of the candidate genes involved in HT stress response identified by RNA-seq. These findings establish a strong foundation for elucidating the role of ABA8ox in cucumber resistance to abiotic stress.</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

Comparative transcriptome analysis reveals the role of CsABA8ox1 in cucumber under high-temperature stress

  • 期刊论文

  • 发表日期：

    2025年11月27日

查看全文
  • Xuewen Xu,
  • Xueting Wang,
  • Hamza Sohail,
  • Qiming Hu,
  • Wenjing Yan,
  • Xiaohua Qi,
  • Xuehao Chen

摘要

High temperature (HT) is a critical abiotic factor that restricts plant growth and development. The role of abscisic acid (ABA) in stress tolerance is well established, and ABA 8’-hydroxylase (ABA8ox), a key enzyme in ABA degradation, is crucial for plant responses to abiotic stress. In this study, a CsABA8ox1-deficient mutant, yf-343, and its wild-type counterpart, BY, were subjected to continuous HT treatment to assess phenotypic, physiological, and transcriptomic changes. Under HT, ABA accumulation increased in BY and yf-343, with significantly higher levels in the yf-343 mutant. Exogenous ABA application accelerated leaf yellowing in BY and triggered pronounced leaf senescence and cell death in yf-343. HT treatment also increased the activities of superoxide dismutase and peroxidase, elevated ABA and malondialdehyde content, and simultaneously inhibited catalase activity and photosynthetic rate. Comparative RNA sequencing (RNA-seq) revealed that genes associated with plant hormone signaling, secondary metabolite biosynthesis, starch and sucrose metabolism, phenylalanine metabolism, and the mitogen-activated protein kinase signaling pathway were differentially expressed between yf-343 and BY under 42 °C HT treatment. Among these, two genes, heat shock proteins 70 (CsHSP70) and wall-associated receptor kinase 2 (CsWAKL2), were validated through virus-induced gene silencing. Knockdown of CsHSP70 and CsWAKL2 enhanced susceptibility to HT, confirming the reliability and significance of the candidate genes involved in HT stress response identified by RNA-seq. These findings establish a strong foundation for elucidating the role of ABA8ox in cucumber resistance to abiotic stress.