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Effects of water depth gradient on physiological characteristics of Vallisneria natans
Journal of Freshwater Ecology ( IF 1.3 ) Pub Date : 2019-01-01 , DOI: 10.1080/02705060.2019.1592029
Yun Cao 1, 2 , Dan Chen 1 , Xin-Sheng Ji 2 , Su-Juan Zhang 2 , Qi Huang 2 , Wen-Lin Wang 3
Affiliation  

Abstract For the purpose of studying the response of the Vallisneria natans antioxidant enzyme defense system to different water depths, we selected seedlings with well-preserved rhizomes, consistent germination and positive growth as experimental plants and put them into 10 plexiglass barrels at depth gradients. After 60 days of simulation experiments, we tested the malondialdehyde (MDA), superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), chlorophyll and soluble protein contents and root activity. The results showed that (1) the contents of Chla, Chlb, Chl (a + b) and Car first increased with water depth and then decreased, reaching maximum values of 0.99, 0.38, 1.37 and 0.20 mg/g, at 110 cm respectively; (2) SOD and POD decreased with increased water depth, with a significant decreasing trend particularly between 30 and 60 days, and MDA showed the same trend as POD. CAT decreased with increased water depth but then showed a two-fold increase trend, probably due to the gradual effects of long-term water stress the antioxidant enzyme system in V. natans leaves. (3) Soluble protein had the same trend as MDA. Root activity implied that the more active the root system is, the more ramets and biomass are produced. In this experiment, the plant grew well at depths of less than 120 cm and showed clear signs of aging or death beyond this depth; the results showed that the antioxidant enzyme defense system engaged a series of antioxidant protection mechanisms to increase plant stress resistance ability and reduce or eliminate the damage of plants, but when the stress increased beyond the tolerance of the plant, the antioxidant defense system was destroyed, which eventually led to the death of the plant.

中文翻译:

水深梯度对苦参生理特性的影响

摘要 为研究苦参抗氧化酶防御系统对不同水深的响应,选择根茎保存完好、发芽一致、生长良好的幼苗作为实验植物,按深度梯度放入10个有机玻璃桶中。经过 60 天的模拟实验,我们测试了丙二醛 (MDA)、超氧化物歧化酶 (SOD)、过氧化物酶 (POD)、过氧化氢酶 (CAT)、叶绿素和可溶性蛋白质含量以及根系活性。结果表明:(1)Chla、Chlb、Chl(a+b)和Car的含量随水深呈先增加后减少的趋势,分别在110 cm处达到最大值0.99、0.38、1.37和0.20 mg/g ; (2) SOD和POD随着水深的增加而降低,下降趋势显着,尤其是在30-60天之间,MDA 与 POD 表现出相同的趋势。CAT随着水深的增加而降低,但随后呈现出两倍的增加趋势,这可能是由于长期水分胁迫对南洋参叶片中抗氧化酶系统的逐渐影响。(3)可溶性蛋白与MDA趋势相同。根系活动意味着根系越活跃,产生的分株和生物量就越多。在这个实验中,植物在小于 120 厘米的深度生长良好,超过这个深度就会出现明显的衰老或死亡迹象;结果表明,抗氧化酶防御系统参与了一系列抗氧化保护机制,以提高植物的抗逆能力,减少或消除植物的损害,但当胁迫增加超过植物耐受时,抗氧化防御系统被破坏,
更新日期:2019-01-01
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