Effects of mechanical damage on leaf veins of nine aquatic plants
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摘要: 水生植物叶片的功能性状特征与陆生植物有所不同，同时叶脉类型也显著影响叶片的功能性状。本研究选取9种具有不同叶脉类型的水生植物，通过对叶脉进行直接损伤，分析叶片性状（形态、色素含量和叶绿素荧光指标）在叶脉受损后的变化程度与叶脉类型的关系。结果显示：具有平行脉的3种水生植物对叶脉损伤具有较强的耐受性；具羽状脉的4种植物主脉受损后显著抑制叶片生长，而侧脉受损的影响在不同物种间有所不同，具有物种特异性。本研究可为大型湖泊水生植物修复的水生物种筛选提供参考。Abstract: Aquatic plants are important primary producers in the littoral zone of lakes and wetlands. As aquatic plants have a close relationship with the aquatic environment, their leaves usually do not need to adapt to water shortages in the soil. Therefore, the leaf traits of aquatic plants are likely to be different from those of terrestrial plants. In addition, leaf vein type is the fundamental basis of leaf functional traits; however, previous studies on leaf vein types and functional traits have not yet been conducted for aquatic plants. In this study, nine aquatic plants with different vein type were selected to analyze the relationship between the changes in leaf traits (e.g., morphology, pigment content, and chlorophyll fluorescence) and vein type after vein cutting. Results showed that the three species with parallel veins exhibited strong tolerance to the main vein cut, whereas the four species with pinnate veins demonstrated significantly reduced pigment content and inhibited leaf growth following the main vein cut. In contrast, the side vein cuts had distinct effects on different species, indicating species-specific effects. Based on leaf vein type, this study provides theoretical guidance for species selection in the re-establishment of aquatic plants in the littoral zone of large lakes.
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