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林业科学 ›› 2008, Vol. 44 ›› Issue (6): 79-84.doi: 10.11707/j.1001-7488.20080613

• 论文 • 上一篇    下一篇

镉处理对杨树光合作用及叶绿素荧光参数的影响*

万雪琴1,2 张 帆1 夏新莉2 尹伟伦2

  

  1. (1.四川农业大学林学院 雅安625014; 2.北京林业大学生物科学与技术学院 北京100083)
  • 收稿日期:2007-10-18 修回日期:1900-01-01 出版日期:2008-06-25 发布日期:2008-06-25
  • 通讯作者: 尹伟伦

Effects of Cadmium on Photosynthesis and Chlorophyll Fluorescence Parameters of Solution Cultured Poplar Plants

Wan Xueqin1,2,Zhang Fan1,Xia Xinli2,Yin Weilun2   

  1. (1.College of Forestry, Sichuan Agricultural University Ya'an 625014; 2.College of Biological Sciences and Biotechnology, Beijing Forestry University Beijing 100083)
  • Received:2007-10-18 Revised:1900-01-01 Online:2008-06-25 Published:2008-06-25

摘要:

用Cd浓度为0、25、50、100 μmol·L-1 Hoagland营养液培养3个欧美杂交杨无性系XMH-4、MH-8、XMH-10〖JP〗扦插苗5个月后,处理植株的叶绿素含量、光合作用、PSⅡ原初光化学反应量子效率均显著降低。对5种与光系统密切相关的矿质元素的分析表明:镉处理显著增加Ca、Mg、Fe、Cu在功能叶的含量,极显著地降低Mn的含量。结合叶绿素荧光和元素分析结果,推测镉胁迫使PSⅡ反应中心氧化端出现电子传递障碍,镉胁迫下的黄化症不是由于Mg或Fe的缺乏引起的,而是镉胁迫导致Mn亏缺,抑制叶绿素合成造成的。

关键词: 镉, 杨树, 光合作用, 叶绿素荧光, 矿质元素

Abstract:

The effects of cadmium(Cd) on photosynthesis and chlorophyll fluorescence parameters were studied in poplar plants. Experiments were carried out with poplar cutting plants of clone XMH-4(Populus deltoides×P. nigra),MH-8(P. trichocarpa × P. deltoides) and XMH-10(P. deltoides × P. nigra) treated with 0, 25, 50, 100 μmol·L-1Cdsolution for 5 months under normal conditions in greenhouse. The result showed that cadmium significantly decreased chlorophyll,photosynthesis and quantum yield of PSⅡphotochemistry. The contents of calcium(Ca), iron(Fe), magnesium(Mg) and copper(Cu) all increased with the 25, 50 μmol·L-1 Cdtreatments, only manganese(Mn) showed a robust negative relation with Cdconcentration. It was suggested that some problems occurred to the electron transport chain at the oxidation side of PSⅡreaction centres(RCs), and the cadmiuminduced etiolation were not caused by lack of iron or magnesium, but manganese. Therefore manganese may play an important role in cadmium stress to plant.

Key words: cadmium, poplar, photosynthesis, chlorophyll fluorescence, metal element