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Background <p><i>Fraxinus mandshurica</i> Rupr. is a key forest species in Northeast Asia, primarily distributed in semi-humid regions. Given its wide range of provenances, <i>F. mandshurica</i> exhibits substantial genetic and phenotypic variations. To identify drought–tolerant lines, we evaluated physiological, biochemical, and growth traits of two-year-old seedlings grown in a semi-arid environment across spring, summar and autumn.</p> Results <p>Principal component analysis (PCA) of 24 trait variables yielded 10 principal components per season, accounting for approximately 85% of the cumulative variation. We developed a comprehensive drought evaluation metric (<i>D</i> value) for each line by calculating weighted averages of PCA scores. Cluster analysis base on seasonal <i>D</i> values categorized 69 <i>F. mandshurica</i> lines into three groups: drought-tolerant, weak drought-sensitive, and drought-sensitive. Using two growth traits, these lines were further classified into high-, medium-, and low-growth groups. From this, we identified five elite lines combining drought tolerance and rapid growth. Stepwise regression revealed that <i>F. mandshurica</i> employs distinct drought-tolerance strategies across seasons.</p> Conclusions <p>We developled robust drought-tolerance evaluation models for <i>F. mandshurica</i> and selected five high-performing lines with dual traits of drought tolerance and fast growth. Our results provided a basis for afforestation efforts of <i>F. mandshurica</i> in semi-arid regions.</p>

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Drought tolerance evaluation of Fraxinus mandshurica in a semi-arid area

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月29日

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  • Kaifang Zhang,
  • Yuan Cao,
  • Xinyue Guo,
  • Xiaonuo Liu,
  • Qing Li,
  • Fanqiu Kong,
  • Fansuo Zeng,
  • Tianzhong Jing,
  • Yaguang Zhan,
  • Fenghui Qi

摘要

Background

Fraxinus mandshurica Rupr. is a key forest species in Northeast Asia, primarily distributed in semi-humid regions. Given its wide range of provenances, F. mandshurica exhibits substantial genetic and phenotypic variations. To identify drought–tolerant lines, we evaluated physiological, biochemical, and growth traits of two-year-old seedlings grown in a semi-arid environment across spring, summar and autumn.

Results

Principal component analysis (PCA) of 24 trait variables yielded 10 principal components per season, accounting for approximately 85% of the cumulative variation. We developed a comprehensive drought evaluation metric (D value) for each line by calculating weighted averages of PCA scores. Cluster analysis base on seasonal D values categorized 69 F. mandshurica lines into three groups: drought-tolerant, weak drought-sensitive, and drought-sensitive. Using two growth traits, these lines were further classified into high-, medium-, and low-growth groups. From this, we identified five elite lines combining drought tolerance and rapid growth. Stepwise regression revealed that F. mandshurica employs distinct drought-tolerance strategies across seasons.

Conclusions

We developled robust drought-tolerance evaluation models for F. mandshurica and selected five high-performing lines with dual traits of drought tolerance and fast growth. Our results provided a basis for afforestation efforts of F. mandshurica in semi-arid regions.