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龙忆年, 鲁汭, 王培, 林莉莉, 陈宇华, 肖恩荣, 吴振斌. 金鱼藻对盐碱胁迫的生理响应研究[J]. 水生生物学报, 2020, 44(1): 213-221. DOI: 10.7541/2020.025
引用本文: 龙忆年, 鲁汭, 王培, 林莉莉, 陈宇华, 肖恩荣, 吴振斌. 金鱼藻对盐碱胁迫的生理响应研究[J]. 水生生物学报, 2020, 44(1): 213-221. DOI: 10.7541/2020.025
LONG Yi-Nian, LU Rui, WANG Pei, LIN Li-Li, CHEN Yu-Hua, XIAO En-Rong, WU Zhen-Bin. STUDY ON PHYSIOLOGICAL REACTION OF CERATOPHYLLUM DEMERSUM TO SALINITY AND ALKALINITY STRESS[J]. ACTA HYDROBIOLOGICA SINICA, 2020, 44(1): 213-221. DOI: 10.7541/2020.025
Citation: LONG Yi-Nian, LU Rui, WANG Pei, LIN Li-Li, CHEN Yu-Hua, XIAO En-Rong, WU Zhen-Bin. STUDY ON PHYSIOLOGICAL REACTION OF CERATOPHYLLUM DEMERSUM TO SALINITY AND ALKALINITY STRESS[J]. ACTA HYDROBIOLOGICA SINICA, 2020, 44(1): 213-221. DOI: 10.7541/2020.025

金鱼藻对盐碱胁迫的生理响应研究

STUDY ON PHYSIOLOGICAL REACTION OF CERATOPHYLLUM DEMERSUM TO SALINITY AND ALKALINITY STRESS

  • 摘要: 白鹤湖作为莫莫格湿地保护区内的代表性湖泊, 正面临着盐碱化和富营养化的风险, 现存沉水植物种类稀少, 为了减缓白鹤湖盐碱化趋势, 为当地沉水植被恢复及物种多样化存续提供研究依据, 以在白鹤湖生物量相对大的金鱼藻(Ceratophyllum demersum)为对象, 研究了其在不同碱度(0、7、10、17 mmol/L)和混合盐碱(盐度0.3、0.6、1、2、4 g/L, 相应碱度1.9、3.8、6.3、12.6、25.2 mmol/L)条件下的生理指标变化。结果表明, 盐度在1.5 g/L以下时, 碱度变化没有对金鱼藻造成影响, 在实验设置的碱度梯度范围内, 金鱼藻均能正常生长, 尽管金鱼藻过氧化物酶(POD)、脯氨酸等均显示出梯度变化, 但依旧能够耐受17 mmol/L以下的碱度条件。随着混合盐碱浓度的升高, 金鱼藻长势呈现由盛至衰败的趋势, 在盐度0.6 g/L、碱度3.8 mmol/L的条件下, 金鱼藻长势最好, 表现出低促高抑的效应。随着盐度升高至2 g/L、碱度12.6 mmol/L, 金鱼藻能耐受胁迫并存活一部分, 尽管此时碱度<17 mmol/L, 也有部分金鱼藻死亡, POD含量急剧升高且植株间差异较大; 当盐度升高到4 g/L、碱度达到25.2 mmol/L时, 金鱼藻21天后全部死亡。在对水培液水质的检测中发现, 混合盐碱的浓度越高, 水中氮磷的去除率越低, 两者呈负相关关系。研究结果为盐碱化湖泊的沉水植被恢复提供了一定的参考。

     

    Abstract: As a representative lake in Momoge Wetland Reserve, White Crane Lake is facing the risk of salinization and eutrophication.In order to slow down the salinization trend and provide research basis for the restoration of submerged vegetation and survival of species diversity of White Crane Lake, this study investigated physiological indexes of Ceratophyllum demersum in different alkalinity (0, 7, 10 and 17 mmol/L) and mixed saline-alkaline (salinity of 0.3, 0.6, 1, 2 and 4 g/L, corresponding alkalinity of 1.9, 3.8, 6.3, 12.6 and 25.2 mmol/L). The results showed that when the salinity was below 1.5 g/L, alkalinity had no effect on C. demersum. Within the range of the alkalinity gradient set in the experiment, C. demersum grown normally. Although C. demersum peroxidase (POD) and proline showed gradient change, C. demersum was still able to tolerate the alkalinity conditions below 17 mmol/L. With the increase of mixed saline-alkaline concentration, the growth of C. demersum showed a trend from flourish to decline. Under the condition of salinity of 0.6 g/L and alkalinity of 3.8 mmol/L, C. demersum had the best growth with the high-promoting and low-inhibiting ability. With the increase of salinity to 2 g/L and alkalinity to 12.6 mmol/L, C. demersum were under stress and survived partially, and the POD content increased sharply and the difference between plants was large. When salinity increased to 4 g/L and alkalinity reached 25.2 mmol/L, all C. demersum died after 21 days explained by the high concentration of mixed saline-alkaline and the low removal rate of nitrogen and phosphorus that are negatively correlated. This study provides reference for the restoration of submerged vegetation in salinized lakes.

     

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