铬胁迫对美人蕉生理生态特性与铬积累的影响
发布时间：2018-07-22 17:08
【摘要】：选取大小一致的美人蕉(Canna indica)作为研究试材,在小型模拟人工湿地系统中,研究含不同浓度(0、5、10、20、40、60 mg/L)铬(VI)胁迫下美人蕉的生理生态响应,为处理含铬(VI)废水的植物修复材料提供科学依据。结果表明,不同浓度铬(VI)胁迫下,美人蕉叶绿素、丙二醛(MDA)、还原型谷光甘肽(GSH)含量呈现出不同程度的变化趋势;其含量先升高后降低,但超氧阴离子变化趋势相反;同时脯氨酸(Pro含量)在不同浓度胁迫下无显著差异。超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)和苯丙氨酸解氨酶(PAL)活性随铬胁迫浓度的增加呈现先升后降的趋势。铬胁迫浓度为20 mg/L时净光合速率(P_n)、气孔导度(G_s)最高,而低浓度(小于40 mg/L)胁迫下蒸腾速率(T_r)、胞间CO_2含量(C_i)无显著差异。综上,铬胁迫下美人蕉对其生理生态特性做出相应的调整,表现较强的适应力和耐污力,可作为处理含铬废水的湿地植物备选物种之一。
[Abstract]:The physiological and ecological responses of Canna indica under different concentrations of chromium (VI) were studied in a small simulated constructed wetland system. It provides scientific basis for the treatment of wastewater containing chromium (VI). The results showed that the contents of chlorophyll, malondialdehyde (MDA) and glutathione (GSH) in different concentrations of chromium (VI) showed a varying trend, and the content of chlorophyll, malondialdehyde (MDA) and glutathione (GSH) increased first and then decreased, but the change trend of superoxide anion was opposite. At the same time, there was no significant difference in proline (Pro) content under different concentrations of stress. The activities of superoxide dismutase (SOD), catalase (cat), peroxidase (POD) and phenylalanine ammonia-lyase (pal) increased firstly and then decreased with the increase of chromium stress concentration. The net photosynthetic rate (PIV) and stomatal conductance (Gs) were the highest at 20 mg / L Cr stress, but there was no significant difference in the transpiration rate (TSP) and the intercellular CO2 content (CSTI) under low concentration (< 40 mg / L). In conclusion, canna can be used as an alternative species for treating wastewater containing chromium by adjusting its physiological and ecological characteristics, showing strong adaptability and resistance to pollution.
【作者单位】： 贵州民族大学喀斯特湿地生态研究中心化学与生态环境工程学院;
【基金】：国家自然科学基金(31560107)资助
【分类号】：X503.231
本文编号：2138166
[Abstract]:The physiological and ecological responses of Canna indica under different concentrations of chromium (VI) were studied in a small simulated constructed wetland system. It provides scientific basis for the treatment of wastewater containing chromium (VI). The results showed that the contents of chlorophyll, malondialdehyde (MDA) and glutathione (GSH) in different concentrations of chromium (VI) showed a varying trend, and the content of chlorophyll, malondialdehyde (MDA) and glutathione (GSH) increased first and then decreased, but the change trend of superoxide anion was opposite. At the same time, there was no significant difference in proline (Pro) content under different concentrations of stress. The activities of superoxide dismutase (SOD), catalase (cat), peroxidase (POD) and phenylalanine ammonia-lyase (pal) increased firstly and then decreased with the increase of chromium stress concentration. The net photosynthetic rate (PIV) and stomatal conductance (Gs) were the highest at 20 mg / L Cr stress, but there was no significant difference in the transpiration rate (TSP) and the intercellular CO2 content (CSTI) under low concentration (< 40 mg / L). In conclusion, canna can be used as an alternative species for treating wastewater containing chromium by adjusting its physiological and ecological characteristics, showing strong adaptability and resistance to pollution.
【作者单位】： 贵州民族大学喀斯特湿地生态研究中心化学与生态环境工程学院;
【基金】：国家自然科学基金(31560107)资助
【分类号】：X503.231
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