LIMITING STEP ON PHOTOSYNTHESIS OF RICE PLANTS TREATED WITH VARYING COPPER LEVELS
LIMITING STEP ON PHOTOSYNTHESIS OF RICE PLANTS TREATED WITH VARYING COPPER LEVELS
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DOI：
10.1016/s0176-1617(11)80741-8
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发表时间：
1991-05-01
影响因子：
4.3
通讯作者：
HENRIQUES, FS
中科院分区：
文献类型：
--
作者：
LIDON, FC;HENRIQUES, FS
研究了在铜浓度为 0.002 至 6.25 mg/L 的营养液中生长 30 天的水稻 (Oryza sativa L.) 植物的光合作用过程。 PSII 依赖性 H2O 到 DCIP 的电子传递在 0.05 mg/L Cu 处理中显示出最大值，此后随着溶液中铜含量的增加而下降；然而，当使用 DPC 时，向 DCIP 的电子转移速率的失活程度较低。 从 0.01 mg/L Cu 处理到 6.25 mg/L Cu 处理，DCIP 到 MV 以及整体 H2O 到 MV 电子转移的速率连续下降。 实验数据表明，铜主要抑制PSII中DPC供体位点之前的光合电子传递。 Rubisco 的活性也被测定，并显示随着溶液介质中铜含量的增加而逐渐降低。 我们得出的结论是，尽管过量的铜以多种方式影响光合作用过程，但最主要的影响是对 Rubisco 的活性的影响，这反过来又限制了整体光合作用活性。
The photosynthetic process of rice (Oryza sativa L.) plants grown over a 30-day period in a nutrient solution containing concentrations of copper ranging from 0.002 to 6.25 mg/L was investigated. The PSII-dependent H2O to DCIP electron transport showed its maximum in the 0.05 mg/L Cu treatment and decreased thereafter with increasing copper levels in the solution; however, when DPC was used, the electron transfer rate to DCIP was less inactivated. The DCIP to MV, as well as the over-all H2O to MV electron transfer, showed a continuous rate decrease from the 0.01 to the 6.25 mg/L Cu treatments. The experimental data indicate that copper inhibits the photosynthetic electron transport mainly before the DPC donation site in the PSII. The activities of Rubisco were also determined and showed a progressive decrease with increasing copper levels in the solution medium. We conclude that although excess copper affects the photosynthetic process in multiple ways, the prevailing effect is that on the activity of Rubisco, which in turn limits the over-all photosynthetic activity.