Abstract: Waterlogging is an important factor influencing wetland plant growth, reproduction and population distribution. To clarify the influence of waterlogging on plant growth and physiological characteristics, we set up four treatments: normal watering (control), completely submerged group, 1/2 immersed group and 1/4 immersed group with Carex cinerascens seedlings as the research object, and determined the morphological indicators (plant height, germination) and physiological indicators (SPAD, MDA, SOD, POD and CAT) under different flooding conditions. The results showed that waterlogging stress inhibited the growth of C. cinerascens seedlings, decreased plant height, and the edges of leaves were damaged and yellow. Waterlogging also affected rhizomatic germination of C. cinerascens, and moderate waterlogging would improve its germination. Waterlogging decreased the leaf relative chlorophyll content, inhibiting the photosynthesis of plant leaves. Waterlogging stress aggravated leaf membrane lipid peroxidation, prompted the MDA levels and increased the activities of corresponding antioxidant enzymes POD, CAT and SOD, indicating that the dynamic balance between the scavenging system and the generation of reactive oxygen species was destroyed. Our study suggests that waterlogging stress would aggravate the membrane lipid peroxidation, inhibit the normal growth of C. cinerascens seedlings, and accelerate the production of antioxidant enzymes to counter the adverse effects of waterlogging stress at the same time.

Key words: nitrogen utilization efficiency., springness wheat, nitrogen accumulation and translocation, nitrogen fertilizer, semi-winterness wheat