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蟛蜞菊耐受土壤Cu污染胁迫的光合特性与机理
林茂兹,金美芳,陈奕安,曾俏丽
0
(福建师范大学福清分校近海流域环境测控治理福建省高校重点实验室,福清 350300; 福建师范大学福清分校海洋与生化工程学院,福清 350300; 武夷学院福建省生态产业绿色技术重点实验室,武夷山 354300)
摘要:
为揭示蟛蜞菊(Wedelia trilobata)耐受土壤Cu污染胁迫的机制,设计盆栽试验模拟土壤Cu污染胁迫处理蟛蜞菊。处理3个月后,测定其地上生物量,叶片叶绿素含量,用Ciras-2测定其叶片气体交换常数、Pn-CO2响应曲线及根呼吸强度,用Handy-PEA测定其叶片荧光参数。结果显示,不同程度的Cu污染胁迫显著(P<0.05)影响蟛蜞菊叶片净光合速率(Pn)、蒸腾速率(E)、气孔导度(Gs)、细胞间CO2浓度(Ci);Cu污染也影响蟛蜞菊叶片Pn-CO2响应曲线;Cu污染胁迫使蟛蜞菊叶片光合性能指数(PIabs)明显下降,单位反应中心吸收的光能(ABS/RC)、单位反应中心捕获的用于还原QA的能量(TR0/RC)、以吸收光能为基础的驱动力(DFabs)、反应中心捕获的激子中用来驱动电子传递到电子传递链中超过QA的其他电子受体的激子占用来驱动QA还原激子的比率(ψE0)、用于电子传递的量子产额(φE 0)等指标均有所下降,快速叶绿素荧光诱导动力学曲线(OJIP)出现K点。但是,不同程度的Cu污染胁迫对蟛蜞菊的地上生物量、根呼吸强度均无显著(P>0.05)影响,非高浓度Cu污染胁迫(≤373.27 mg·kg-1)对蟛蜞菊叶片Chla、Chlb也无显著(P>0.05)影响。研究结果说明蟛蜞菊能耐受Cu污染胁迫以叶绿素不受破坏和根系活力不受影响为基础。
关键词:  土壤  蟛蜞菊  Cu污染  光合作用  根呼吸
DOI:10.13610/j.cnki.1672-352x.20180825.030
基金项目:国家自然科学基金(31370589)和福建省生态产业绿色技术重点实验室开放基金(WYKF2017-3)共同资助。
Photosynthetic traits of Wedelia trilobata growing in Cu-contaminated soil and its resistance mechanism on Cu-contamination
LIN Maozi,JIN Meifang,CHEN Yian,ZENG Qiaoli
(1 Key Laboratory of Measurement and Control System for Coastal Environment, Fuqing Branch of Fujian Normal University, Fuqing 350300; School of Ocean Science and Biochemistry Engineering, Fuqing Branch of Fujian Normal University, Fuqing 350300; Provincial Key Laboratory of Eco-Industrial Green Technology, Wuyi University, Wuyishan 354300)
Abstract:
In order to reveal the resistance mechanism of Wedelia trilobata on Cu-contamination, a pot-culture experiment was designed to study the effect of soil Cu-contamination on the photosynthesis, root respiration and growth of W. trilobata. The plant was exposed to exogenous Cu application for three months, and the above-ground biomass and leaf chlorophyll content of W. trilobata were measured; leaf gas exchange parameters, root respiration rate and leaf Pn-CO2 response curve were determined using CIRAS-2, and the leaf chlorophyll a fluorescence parameters were measured using Handy-PEA. The results showed that, the net photosynthetic rate (Pn), transpiration rate (E), stomatal conductance (Gs) and intercellular CO2 concentration (Ci) were significantly negatively associated with Cu-contamination; the Pn-CO2 response curve was also negatively affected by Cu-contamination; the photosynthetic performance index (PIabs) was clearly decreased with the Cu-contamination, and the probability that photon absorption (ABS/RC), energy flux for trapping at t=0 (TR0/RC), electron driving forces (DFabs) ,efficiency with which a trapped exciton can move an electron into the electron transport chain (ψE0) ,an absorbed photon will move an electron into the electron transport chain (φE0), and were also changed with Cu-contamination; K peak appeared in the fluorescence transient curves under Cu-contamination. However, aboveground biomass and root respiratory rate of W. trilobata had not been significantly affected by the Cu polluted stress in varying degrees (P>0.05) .In the low
Key words:  soil  Wedelia trilobata  Cu-contamination  photosynthesis  root respiration

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