铀胁迫对2种植物荧光生理及累积特性的影响

发布时间：2018-05-07 17:03

本文选题：铀 + 水芹　；参考：《环境科学与技术》2016年11期

【摘要】：针对放射性污染水体富集水生植物的筛选及核素处理能力关键技术问题,通过水培试验,研究了铀胁迫对水芹和铜钱草的生理特性、叶绿素荧光特性及吸收富集能力的影响。结果表明:(1)在55 mg/L铀处理下水芹和铜钱草的叶绿素a、叶绿素b和类胡萝卜素含量下降最为显著,与对照组相比分别下降了52.54%、65.27%、67.89%和63.20%、79.82%、45.19%,与对照组相比水芹和铜钱草最大光化学效率(Fv/Fm)分别下降了2.3%和1.3%,光和性能指数(PIABS)分别下降了24.3%和30.9%;(2)在铀处理下,2种植物的抗氧化酶系统均受到不同程度影响,SOD、POD和CAT活性均呈先升后降的趋势,在55 mg/L的铀处理下MDA含量达到最高,分别比对照上升了118.63%和91.72%。(3)水芹和铜钱草对铀的富集浓度在55 mg/L处理下达到最大,根、茎和叶各部铀浓度分别达到3 637.2、322.9、373.4 mg/kg和2 908.8、262.7、136.5 mg/kg;水芹和铜钱草对铀均有一定的富集能力和耐受性。
[Abstract]:The effects of uranium stress on the physiological characteristics, chlorophyll fluorescence characteristics and absorption and enrichment ability of water celery and Coppergrass were studied by hydroponics test in view of the selection of aquatic plants and the ability of nuclide treatment in radioactive polluted water. The results showed that the contents of chlorophyll a, chlorophyll b and carotenoid decreased most significantly in the water celery and coppergrass treated with uranium at 55 mg/L. Compared with the control group, the maximum photochemical efficiency (FV / Fm) of water celery and coppergrass decreased by 2.3% and 1.3%, respectively, and the light and performance index (PIABSs) decreased by 24.3% and 30.950%, respectively, and the antioxidant activity of two plants treated with uranium was decreased by 24.3% and 30.9%, respectively, and by 63.20% and 63.20%, respectively, as compared with the control group, and the maximum photochemical efficiency (FV / Fm) was decreased by 2.3% and 1.3%, respectively, and the light and performance index (PIABSs) decreased by 24.3% and 30.950% respectively. The activity of POD and CAT increased first and then decreased. The concentration of MDA reached the highest under uranium treatment of 55 mg/L, which increased by 118.63% and 91.72%, respectively. The uranium concentrations in stems and leaves were 3 637.2322.9U 373.4 mg/kg and 2 908.8262.7U 136.5 mg / kg, respectively.
【作者单位】：西南科技大学生命科学与工程学院;西南科技大学核废物与环境安全国防重点学科实验室;
【基金】：国家核设施退役及放射性废物治理科研重点项目资助(14ZG6101)
【分类号】：X173;X591

【相似文献】