Drought stress memory in the photosynthetic mechanisms of an invasive CAM species, Aptenia cordifolia

详细信息    查看全文

• 作者：Marta Pintó-Marijuan ; Alba Cotado ; Eva Fleta-Soriano…
• 关键词：Abiotic stress ; Chloroplast pigments ; Crassulacean acid metabolism ; Photoprotection ; Photosynthesis ; Vitamin E
• 刊名：Photosynthesis Research
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：131
• 期：3
• 页码：241-253
• 全文大小：
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Plant Sciences; Plant Physiology; Biochemistry, general; Plant Genetics & Genomics;
• 出版者：Springer Netherlands
• ISSN：1573-5079
• 卷排序：131

文摘

Plants are known for their high capacity to acclimatise to fluctuating environmental conditions. A wide range of environmental conditions can lead to suboptimal physiological efficiency. However, recent studies have shown that plants can withstand repeated periods of stress. To find out how they do it, we studied photosynthetic adjustments to repeated water stress in Aptenia cordifolia: a facultative, invasive CAM species. Plants were subjected to three cycles of water deficit, and photosynthetic parameters and chloroplast antioxidants were quantified to gain an understanding of the mechanisms by which they cope with repeated stress periods. Significant modification of the photosystems’ antenna and reaction centres was observed in plants subjected to previous water stress cycles, and this led to higher PSII efficiency than in plants challenged with drought for the first time. These findings underline the biological significance of stress memory and show how plants can adjust their photosynthetic apparatus to fluctuating environmental conditions and thus optimise photosynthesis and photoprotection under drought conditions.