The objective of this study was to compare drought resistance in a range of seashore paspalum (Paspalum vaginatum Sw.) genotypes and identify associated morphological and physiological traits. Fifteen genotypes were grown in growth chamber conditions and exposed to well-watered and drought-stress treatments. Genotypes ‘Seaisle1’ and PI647891 were consistent top performers, whereas ‘Seastar’ and PI614680 performed poorly as measured by turf quality, percentage green cover, and relative water content when exposed to drought stress. Observed levels of drought resistance had no significant relation with morphological traits such as leaf width and internode length but were found to be associated with various physiological traits. Drought resistant genotypes were able to better maintain membrane stability, photosynthesis, and had greater water use efficiency compared with sensitive genotypes. Earlier osmotic adjustment at 7 d via faster osmolyte accumulation was a significant contributor to performance during drought. Drought-resistant Seaisle1 and PI647891 had deeper roots and greater root length density than drought sensitive ‘Seastar’ and PI614680. Results showing variability in the level of drought resistance and associated mechanisms in understudied seashore paspalum genotypes could facilitate future breeding efforts for developing drought-resistant turfgrass cultivars.

中文翻译：

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利用叶片气体交换、渗透调节和生根特性评估海滨雀稗基因型的抗旱性

本研究的目的是比较一系列海滨雀稗（Paspalum vaginatumSw.) 基因型并确定相关的形态和生理特征。十五种基因型在生长室条件下生长，并暴露于充足的水分和干旱胁迫处理。基因型 'Seaisle1' 和 PI647891 始终表现最佳，而 'Seastar' 和 PI614680 在暴露于干旱压力下时表现不佳，如草坪质量、绿色覆盖百分比和相对含水量。观察到的抗旱水平与叶片宽度和节间长度等形态特征没有显着关系，但发现与各种生理特征有关。与敏感基因型相比，抗旱基因型能够更好地保持膜稳定性和光合作用，并具有更高的水分利用效率。通过更快的渗透物积累在第 7 天进行早期渗透调节是干旱期间性能的重要贡献者。与干旱敏感的“海星”和 PI614680 相比，抗旱的 Seaisle1 和 PI647891 具有更深的根和更大的根长密度。结果表明，在研究不足的海滨雀稗基因型中，抗旱水平和相关机制的可变性可以促进未来培育抗旱草坪草品种的育种工作。