不定根对提高湿地植物水淹耐受能力的机制研究

Flooding is a common abiotic stress factor that significantly restrains functions of different plant organs, especially sediment roots, thus limiting plant survival and growth. Due to global warming, the severity and frequency of floods is predicted to substantially increase in the near future. Flooding-induced adventitious root formation is an important adaptation to flooding, which adequately improves plant resistance to flooding. So far, however, very few studies have investigated the underlying mechanism for adventitious roots to improve plant resistance to flooding. Using methods of experimental ecology, ecophysiology and stable isotopes in this study, we will first investigate the key morphological and anatomical traits contributing most to the benefits of adventitious roots to flooding resistance in common wetland plant species, then quantify the importance of adventitious roots in nutrient uptake relative to the sediment roots and examine the effects of adventitious roots on the aeration of sediment roots. This study will enrich the theory of plant adaptation to environmental stress and provide reliable information on the re-vegetation of degraded wetlands.

水淹是常见的环境胁迫因子，严重威胁植物根系的存活及其功能，从而显著抑制植物的存活与生长。随着全球气候变暖的加剧，局部水淹强度和频率均呈显著上升趋势。不定根作为水淹的重要适应性状，在提高植物的耐淹能力方面发挥着重要作用。然而，目前国内外关于不定根对提高植物耐淹能力的内在机理研究仍十分缺乏。本研究以我国常见湿地植物为研究对象，运用实验生态学、生理生态学和稳定同位素等方法研究影响不定根贡献的关键性状，并从不定根的功能入手研究不定根对植物矿物质元素吸收在整个根系中的贡献比例和不定根对地下原始根系内部通气状况的影响，从而揭示不定根对提高植物水淹耐受能力的作用机理。本研究将进一步完善湿地植物植物对水淹胁迫适应进化的基础理论，为湿地植被恢复与重建提供重要的理论基础和科学依据。

水淹是常见的环境胁迫因子，严重威胁植物根系的存活及其功能，从而显著抑制植物的存活与生长。不定根作为水淹的重要适应性状，在提高植物的耐淹能力方面发挥着重要作用。本研究以常见湿地植物为对象，研究了水淹对湿地植物生长和不定根产生的影响、不定根对湿地植物生长、对矿质元素吸收和对地下原始根系内部通气状况的影响及水体养分水平和片段化对水生克隆植物生长、形态和/或生物量分配的影响，揭示出水淹对湿地植物不定根产生的影响机制及不定根对提高植物水淹耐受能力的作用机理。迄今为止，已发表SCI论文3篇，授权国家发明专利一项。研究成果可为湿地植被恢复与重建提供重要的理论基础和科学依据。