Giordanoj D, BartáK M, Hájek J
Masaryk University, Faculty of Science, Department of Experimental Biology, Laboratory of Photosynthetic Processes, Kamenice 5, 62500 Brno, Czech Republic.
Photosynthetica. 2025 Jul 8;63(2):182-195. doi: 10.32615/ps.2025.020. eCollection 2025.
The adverse effects of cadmium on plants are accompanied by a limitation of photosynthesis, due to the production of reactive oxygen species, leading to oxidative damage to PSII and the disruption of key protein complexes involved in photosynthetic pathways. We investigated the effects of cadmium stress combined with high light in , as dependent on the cadmium dose applied. The aim was to investigate the combined effect of the two stressors on photochemical processes with the hypothesis that Cd stress enhances the negative effect of the high light. The plants were treated with 0, 1, 10, and 50 mM Cd added as CdCl solution to soil (potted plants), and a high light stress. The highest dose (50 mM) induced a significant oxidative stress, reduced chlorophyll fluorescence parameters related to PSII functioning and increased energy dissipation mechanisms. Elevated Cd contents impaired the electron transport and limited PSII efficiency. OJIP analysis revealed a Cd-induced K- and L-band appearance documenting LHC-PSII limitation. The combination of Cd and high light stress resulted in the photoinhibition effects in PSII, , a decrease in potential and effective yields of PSII.
镉对植物的不利影响伴随着光合作用的受限，这是由于活性氧的产生，导致对光系统II的氧化损伤以及光合途径中关键蛋白质复合物的破坏。我们研究了镉胁迫与高光共同作用的影响，该影响取决于所施加的镉剂量。目的是研究这两种胁迫因素对光化学过程的综合影响，并假设镉胁迫会增强高光的负面影响。将0、1、10和50 mM的镉以氯化镉溶液的形式添加到土壤（盆栽植物）中对植物进行处理，并施加高光胁迫。最高剂量（50 mM）诱导了显著的氧化胁迫，降低了与光系统II功能相关的叶绿素荧光参数，并增加了能量耗散机制。镉含量升高损害了电子传递并限制了光系统II的效率。OJIP分析揭示了镉诱导的K带和L带出现，证明了光系统II捕光复合物的受限。镉与高光胁迫的共同作用导致了光系统II中的光抑制效应，即光系统II的潜在产量和有效产量降低。
