Photosynthesis and Stress Physiology of Plants, Heinrich Heine University Düsseldorf, Düsseldorf, Germany.
Physiol Plant. 2024 Mar-Apr;176(2):e14233. doi: 10.1111/ppl.14233.
The performance and acclimation strategies of Chlamydomonas reinhardtii under stress conditions are typically studied in response to single stress factors. Under natural conditions, however, organisms rarely face only one stressor at a time. Here, we investigated the impact of combined salt and high light stress on the photoprotective response of C. reinhardtii. Compared to the single stress factors, the combination of both stressors decreased the photosynthetic performance, while the activation of energy dissipation remained unaffected. However, the PsbS protein was strongly accumulated and the conversion of violaxanthin to zeaxanthin was enhanced. These results support an important photoprotective function of PsbS and zeaxanthin independently of energy dissipation under combined salt and high light stress in C. reinhardtii.
在胁迫条件下，莱茵衣藻的性能和适应策略通常是针对单一胁迫因素进行研究的。然而，在自然条件下，生物很少会一次只面临一种胁迫源。在这里，我们研究了盐和高光联合胁迫对莱茵衣藻光保护反应的影响。与单一胁迫因素相比，两种胁迫源的组合降低了光合作用性能，而能量耗散的激活则不受影响。然而，PsbS 蛋白大量积累，紫黄质向玉米黄质的转化增强。这些结果表明，在莱茵衣藻中，PsbS 和玉米黄质在盐和高光联合胁迫下具有独立于能量耗散的重要光保护功能。
