PDF(Pubmed)
Abstract：
Flooding stress is an increasingly serious problem in wetlands, often affecting large areas of crops and timber production areas. The current study aimed to explore the species differences in responses to flooding stress between Q. nuttallii and Q. palustris in an outdoor environment. All the tested plants survived after a 60-day flooding treatment that left 5 cm of water above the soil surface. This suggests that the two species are flood-tolerant, so they can be applied in the construction of riparian protection forests and wetland restoration. Compared with control conditions, flooding treatment significantly decreased seedling height and diameter and the Pn, Gs, Tr, Fv/Fm, ABS/CSm, TR0/CSm, ET0/CSm, RE0/CSm, IAA, and GA3 content and significantly increased the content of MDA, H2O2, soluble sugars, SOD, POD, ADH, ABA, and JA. Under control conditions, Q. nuttallii showed significantly greater growth and photosynthetic capability than Q. palustris. In contrast, Q. palustris exhibited less inhibition of growth and photosynthesis, oxidative stress levels, and antioxidant enzyme activities than Q. nuttallii under flooding conditions. The findings indicate that Q. palustris has better defense mechanisms against the damage caused by flooding stress than Q. nuttallii. Q. nuttallii was more sensitive and responsive to flooding than Q. palustris.
摘要：
洪水压力是湿地日益严重的问题，经常影响大面积的农作物和木材生产区域。本研究旨在探讨Q.nuttallii和Q.palustris在户外环境中对洪水胁迫的反应的物种差异。在60天的洪水处理后，所有测试的植物都存活下来，该处理在土壤表面上方留下5厘米的水。这表明这两个物种是耐洪水的，因此，它们可以应用于河岸防护林的建设和湿地恢复。与控制条件相比，淹水处理显着降低了幼苗的高度和直径以及Pn，Gs,Tr,Fv/Fm,ABS/CSm,TR0/CSm,ET0/CSm,RE0/CSm,IAA,和GA3含量，显著提高MDA含量，H2O2，可溶性糖，SOD,POD,ADH,ABA,还有JA.在控制条件下,Q.nuttallii的生长和光合能力明显高于Q.palustris。相比之下,Q.palustris对生长和光合作用的抑制作用较小，氧化应激水平，和抗氧化酶活性比Q.nuttallii在洪水条件下。研究结果表明，与Q.nuttallii相比，Q.palustris对洪水胁迫造成的破坏具有更好的防御机制。纳曲利比Q更敏感，对洪水更敏感。palustris。
