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Deciphering Drought Response Mechanisms in Oat Through Comprehensive Transcriptomic and Physiological Analysis.

Baiji Wang1, Hang Yin1, Xinyi Zhang1

  • 1Department of Grassland Science, College of Animal Science and Technology, Northeast Agricultural University, Harbin 150030, China.

Plants (Basel, Switzerland)
|February 13, 2026
PubMed
Summary
This summary is machine-generated.

Oat varieties show distinct molecular responses to drought stress, with tolerant types enhancing metabolic activities via ABA signaling. This research aids in developing drought-resilient oat crops.

Keywords:
drought stresshub geneoatphysiological indicatortranscriptomic analysis

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Area of Science:

  • Plant Science
  • Molecular Biology
  • Agronomy

Background:

  • Drought stress significantly impacts oat production, a vital cereal and forage crop.
  • The molecular mechanisms of oat drought response are not well understood.
  • Identifying drought-tolerant varieties and their underlying genetic basis is crucial for crop improvement.

Purpose of the Study:

  • To investigate the molecular mechanisms of drought tolerance in oat varieties.
  • To identify key genes and pathways involved in oat's response to drought stress.
  • To provide insights for molecular breeding of drought-tolerant oat cultivars.

Main Methods:

  • K-means clustering and grey relational analysis for variety classification.
  • Physiological trait measurements (chlorophyll, osmolytes, antioxidant enzymes).
  • Transcriptomic analysis (RNA-Seq), KEGG pathway analysis, and Weighted Gene Co-expression Network Analysis (WGCNA).

Main Results:

  • Drought-tolerant and sensitive oat varieties exhibited differential physiological responses.
  • 1915 differentially expressed genes (DEGs) were identified across stress conditions.
  • ABA signaling pathway, particularly increased PP2C gene expression, was implicated in drought tolerance.
  • WGCNA identified gene modules correlated with physiological traits, with six core genes linked to CAT activity.

Conclusions:

  • Oat drought tolerance involves complex molecular mechanisms, including ABA-mediated metabolic regulation.
  • Specific genes and pathways are crucial for differentiating oat responses to drought stress.
  • Findings support the molecular breeding of enhanced drought-tolerant oat varieties.