| Cd胁迫对凹叶厚朴生物量及光合荧光特性的影响 |
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| 引用本文： | 陈剑成,罗睿,万娟,刘家琪,宋鹏,吴玉香,郑郁善,陈礼光.Cd胁迫对凹叶厚朴生物量及光合荧光特性的影响[J].福建农业学报,2016(9):939-944. |
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| 作者姓名： | 陈剑成 罗睿 万娟 刘家琪 宋鹏 吴玉香 郑郁善 陈礼光 |
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| 作者单位： | 1. 福建农林大学林学院,福建 福州,350002;2. 福建农林大学艺术园林学院,福建 福州,350002 |
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| 基金项目： | 国家科技支撑计划(2011BAI01B06)，福建省科技重点项目(2009Y0003) |
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| 摘 要： | 以2年生的凹叶厚朴幼苗为试验对象,设置0(CK)、50、100、200和300mg·kg~(-1)等5个梯度,研究Cd胁迫对厚朴幼苗生物量、叶绿素SPAD值、各组织部分Cd含量和叶绿素荧光合特性的影响。厚朴幼苗根干质量Cd积累最高达325.76mg·kg~(-1),地上部分干质量Cd积累最高仅为13.56mg·kg~(-1),而根部Cd积累量占到全株Cd积累量的95.71%~96.23%,其地下组织部分Cd含量高于地上组织部分,说明厚朴幼苗根吸收的镉主要积累在根部。厚朴幼苗株高增长量随Cd含量的增加而下降,在高Cd胁迫下,叶绿素SPAD值呈差异极显著变化,低Cd胁迫下厚朴仍能生长和代谢,说明厚朴有一定的适应性。4个Cd处理下厚朴幼苗的PSⅡ的最大量子产量(Fv/Fm)、实际的光化学有效量子产量(ΦPSⅡ)、化学淬灭(qP)、电子传递效率(ETR)与CK组相比均显著下降,说明Cd处理阻碍了凹叶厚朴叶片光合反应链中电子传递,进而影响PSⅡ反应中心活性,改变了对光能捕获与转换及电子传递效率,产生光抑制,进而造成对植物的损伤。
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| 关 键 词： | Cd胁迫 厚朴 生物量 叶绿素SPAD 叶绿素荧光特征 |
Effects of Cd Stress on Biomass and Photosynthesis Fluorescence Characteristics o f Magnolia officinalis |
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| Abstract: | Two-year-old Magnolia officinalis seedlings were used in this experimentation.Effects of Cd stress on the biomass,chlorophyll SPAD value,and chlorophyll fluorescence characteristics,as well as Cd contents in various parts of the plant,under 5 gradients of Cd stress including 0 (CK),50,100,200,and 300 mg·kg-1 were studied to unveil the underlying mechanism.In the seedling plants and parts,it was found that the highest accumulated Cd concentrations (dry weight)were 325.76 mg·kg-1 in the roots,and 13.56 mg·kg-1 in the aboveground parts. In general,95.71%-96.23% of the total Cd accumulated on the plant were found in the roots. The seedling height decreased with increasing Cd concentration. Compared with CK,all treatment groups except 50 mg·kg-1 ,showed significant decreases on SPAD chlorophyll. When the Cd concentration was low,the plants appeared to adapt and continue to grow and metabolize. Nonetheless,the PSII maximum quantum yield (Fv/Fm),actual photochemical quantum yield (ΦPSⅡ),chemical quenching (qP),and electron transport efficiency (ETR)were significantly decreased due to high Cd stress as compared to CK indicating that the energy capture from the sunlight,ETR,PSII activity,and metabolism were all suppressed resulting in damage to the plant. |
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| Keywords: | Cd stress Magnolia officinalis biomass chlorophyll SPAD value chlorophyll fluorescence characteristics |
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