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[1]简敏菲,张乖乖,史雅甜,等.土壤镉、铅及其复合污染胁迫对丁香蓼(Ludwigia prostrata)生长和光合荧光特性的影响[J].应用与环境生物学报,2017,23(05):837-844.[doi:10.3724/SP.J.1145.2017.03030]
 JIAN Minfei**,ZHANG Guaiguai,SHI Yatian,et al.Effects of single and combined pollution stress of cadmium and lead in soil on the growth and photosynthetic fluorescence characteristics of Ludwigia prostrata[J].Chinese Journal of Applied & Environmental Biology,2017,23(05):837-844.[doi:10.3724/SP.J.1145.2017.03030]
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土壤镉、铅及其复合污染胁迫对丁香蓼(Ludwigia prostrata)生长和光合荧光特性的影响()
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《应用与环境生物学报》[ISSN:1006-687X/CN:51-1482/Q]

卷:
23卷
期数:
2017年05期
页码:
837-844
栏目:
研究论文
出版日期:
2017-10-25

文章信息/Info

Title:
Effects of single and combined pollution stress of cadmium and lead in soil on the growth and photosynthetic fluorescence characteristics of Ludwigia prostrata
作者:
简敏菲张乖乖史雅甜余厚平陈奕奇
1江西师范大学生命科学学院/江西省亚热带植物资源保护与利用重点实验室 南昌 330022 2江西师范大学基建处 南昌 330022 3诺丁汉大学地理学院 英国诺丁汉 NG7 2RD
Author(s):
JIAN Minfei1** ZHANG Guaiguai1 SHI Yatian1 YU Houping2 & CHEN Yiqi3
1 College of Life Science, Jiangxi Provincial Key Laboratory of Protection and Utilization of Subtropical Plant Resources, Jiangxi Normal University, Nanchang 330022, China 2 Infrastructure Department, Jiangxi Normal University, Nanchang 330022, China 3 School of Geography, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
关键词:
丁香蓼重金属复合胁迫生理生化特性
Keywords:
Ludwigia prostrata heavy metal lead cadmium combined pollution physiological and biochemical characteristics
分类号:
X173:X53
DOI:
10.3724/SP.J.1145.2017.03030
摘要:
通过室内盆栽土培试验,研究铅(Pb)、镉(Cd)单因素及其复合污染对田间杂草丁香蓼(Ludwigia prostrata Roxb.)生长及光合荧光等生理特性的影响. 结果表明:(1)随着Cd、Pb单因素及其复合污染浓度升高,丁香蓼的茎长、根长和鲜重等指标均显著下降(P < 0.05). (2)叶绿素a、b含量或叶绿素a/b值随胁迫浓度的增加而显著降低. (3)单因素Pb污染对丁香蓼的PSII反应中心(光系统II反应中心)的影响不显著;在单因素Cd的最高浓度T50(80 mg/kg)污染胁迫下,丁香蓼的PSII最大量子产率(QYmax)、稳态下的有效量子产率(Fv/Fm_Lss)和稳态下的非光化学猝灭(NPQ_Lss)值仅为对照组(CK)的37%、51%、14%;且与对照组相比,Cd胁迫下丁香蓼的Fo、Fm、Fv、Fv/Fo的降幅也均显著高于单因素Pb胁迫下或Pb、Cd复合污染胁迫下的降幅;综合分析表明单因素Cd对PSII反应中心的影响最强,双因素Pb、Cd复合污染影响次之,单因素Pb胁迫下的影响最小. (4)丁香蓼各部位的重金属含量随胁迫浓度增加而上升,且在Pb、Cd复合污染胁迫下,Cd能促进丁香蓼对Pb的吸收. 综上表明,丁香蓼对Pb、Cd及其复合污染物均具有较强的耐受性及富集能力,可尝试用于Pb、Cd重金属污染土壤的生态修复. (图3 表4 参35)
Abstract:
Ludwigia prostrata Roxb. is a field weed, which is widely distributed in the southern part of China. In this study, we investigated how the growth and photosynthetic fluorescence characteristics of L. prostrata are affected by single-factor pollution stress of lead or cadmium and their combined pollution stress using pot experimental methods in the laboratory. The results indicate that the stem length, root length, total weight, and chlorophyll a, b, and a/b content of L. prostrata under different heavy metal pollution stresses all decreased (P < 0.05) with increasing concentrations of single-factor or two-factor lead and cadmium. The pollution stress of single-factor or two-factor lead and cadmium at lower concentrations caused some damage to the physiological systems of L. prostrata and two-factor pollution stress of lead and cadmium at higher concentrations had a role in promoting growth. The contents of chlorophyll a or b and the chlorophyll a/b ratio reduced significantly with increase in stress concentration but increased under single-factor or two-factor pollution stress of lead and cadmium at higher concentrations. The single-factor cadmium, but not lead, pollution stress had no significant effects on PSⅡreaction centers. The maximum quantum yield (QYmax), effective photochemical efficiency (Fv/Fm_Lss), and non-photochemical quenching (NPQ_Lss) under the pollution stress of single-factor cadmium at the highest concentration (T50) were only 37%, 51%, 14% of those of the control group, respectively. Furthermore, the decline in Fo, Fm, Fv, and Fv/Fo under single-factor cadmium pollution stress at different concentration was larger than those of both single-factor lead and two-factor lead and cadmium at the corresponding concentration. The comprehensive analysis showed that the single-factor cadmium pollution stress had the strongest effects on the PSII reaction center, followed by those of double-factor lead and cadmium, and the effects of single-factor lead pollution stress were the weakest. The above results show that L. prostrata has strong tolerance and enrichment ability for cadmium, lead, and their combination, which indicates that L. prostrata can be used in the ecological restoration of soil polluted by the heavy metals lead and cadmium.

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更新日期/Last Update: 2017-10-25