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<p>Waterlogging is a major abiotic stress faced by riparian plants, posing severe threats to plant physiological metabolism and survival. <i>Salix viminalis</i> L., an important riparian species, exhibits strong tolerance to waterlogging. The formation of aquatic adventitious roots (AARs) is a key morphological response of <i>S. viminalis</i> under waterlogging conditions. However, the specific role of AARs in waterlogging tolerance in <i>S. viminalis</i> remains unclear. In this study, simulated waterlogging induced the formation of AARs, and AAR-removal treatments were used to systematically assess their effects on plant growth, photosynthesis, and physiological traits. The results revealed that AARs significantly increased plant height, aboveground biomass, and the root-to-shoot ratio. AARs also helped maintain stomatal opening, resulting in a higher net photosynthetic rate (P<sub>n</sub>). In addition, AARs significantly enhanced the activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and ascorbate peroxidase (APX), while significantly reducing the contents of superoxide anion radicals (O<sub>2</sub><sup>.−</sup>) and the malondialdehyde (MDA) content, thus effectively alleviating oxidative damage. Moreover, AARs significantly promoted the accumulation of osmotic regulatory substances, including proline (Pro), soluble sugars (SS), reducing sugars (RS), and soluble proteins (SP), thus enhancing the plant’s osmotic adjustment capacity. Furthermore, AARs played a critical role in maintaining the vitality of the primary root system. In summary, AARs enhance the waterlogging tolerance of <i>S. viminalis</i> by modulating both morphological and physiological traits. This study could provide a reference for the application of <i>S. viminalis</i> in riparian and wetland ecosystems, and offer theoretical guidance for the selection and breeding of waterlogging-tolerant woody plants.</p>

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Mechanistic study of aquatic adventitious roots enhancing growth and physiological traits of Salix viminalis under waterlogging stress

  • 期刊论文

  • 发表日期：

    2026年4月19日

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  • Menglong Yin,
  • Haidong Li,
  • Jing Li,
  • Shaowei Zhang,
  • Shanjun Yi,
  • Zhi Zuo,
  • Feifei Zhai,
  • Yunxing Zhang

摘要

Waterlogging is a major abiotic stress faced by riparian plants, posing severe threats to plant physiological metabolism and survival. Salix viminalis L., an important riparian species, exhibits strong tolerance to waterlogging. The formation of aquatic adventitious roots (AARs) is a key morphological response of S. viminalis under waterlogging conditions. However, the specific role of AARs in waterlogging tolerance in S. viminalis remains unclear. In this study, simulated waterlogging induced the formation of AARs, and AAR-removal treatments were used to systematically assess their effects on plant growth, photosynthesis, and physiological traits. The results revealed that AARs significantly increased plant height, aboveground biomass, and the root-to-shoot ratio. AARs also helped maintain stomatal opening, resulting in a higher net photosynthetic rate (Pn). In addition, AARs significantly enhanced the activities of superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and ascorbate peroxidase (APX), while significantly reducing the contents of superoxide anion radicals (O2.−) and the malondialdehyde (MDA) content, thus effectively alleviating oxidative damage. Moreover, AARs significantly promoted the accumulation of osmotic regulatory substances, including proline (Pro), soluble sugars (SS), reducing sugars (RS), and soluble proteins (SP), thus enhancing the plant’s osmotic adjustment capacity. Furthermore, AARs played a critical role in maintaining the vitality of the primary root system. In summary, AARs enhance the waterlogging tolerance of S. viminalis by modulating both morphological and physiological traits. This study could provide a reference for the application of S. viminalis in riparian and wetland ecosystems, and offer theoretical guidance for the selection and breeding of waterlogging-tolerant woody plants.