| Title: | Pre-harvest UV-C irradiation triggers VOCs accumulation with alteration of antioxidant enzymes and phytohormones in strawberry leaves |
| Author(s): | Xu Y; Luo Z; Charles MT; Rolland D; Roussel D; |
| Address: | "Zhejiang University, College of Biosystems Engineering and Food Science, Key Laboratory of Agro-Products Postharvest Handling Ministry of Agriculture, Hangzhou, 310058, People's Republic of China; Agriculture and Agri-Food Canada, Saint-Jean-sur-Richelieu Research and Development Centre,430 Boulevard Gouin, Saint-Jean-sur-Richelieu, Quebec, J3 B 3E6, Canada. Zhejiang University, College of Biosystems Engineering and Food Science, Key Laboratory of Agro-Products Postharvest Handling Ministry of Agriculture, Hangzhou, 310058, People's Republic of China. Electronic address: luozisheng@zju.edu.cn. Agriculture and Agri-Food Canada, Saint-Jean-sur-Richelieu Research and Development Centre,430 Boulevard Gouin, Saint-Jean-sur-Richelieu, Quebec, J3 B 3E6, Canada. Electronic address: marietherese.charles@agr.gc.ca. Agriculture and Agri-Food Canada, Saint-Jean-sur-Richelieu Research and Development Centre,430 Boulevard Gouin, Saint-Jean-sur-Richelieu, Quebec, J3 B 3E6, Canada" |
| DOI: | 10.1016/j.jplph.2017.09.002 |
| ISSN/ISBN: | 1618-1328 (Electronic) 0176-1617 (Linking) |
| Abstract: | "Recent studies have highlighted the biological and physiological effects of pre-harvest ultraviolet (UV)-C treatment on growing plants. However, little is known about the involvement of volatile organic compounds (VOCs) and their response to this treatment. In this study, strawberry plants were exposed to three different doses of UV-C radiation for seven weeks (a low dose: 9.6kJm(-2); a medium dose: 15kJm(-2); and a high-dose: 29.4kJm(-2)). Changes in VOC profiles were investigated and an attempt was made to identify factors that may be involved in the regulation of these alterations. Principle compounds analysis revealed that VOC profiles of UV-C treated samples were significantly altered with 26 VOCs being the major contributors to segregation. Among them, 18 fatty acid-derived VOCs accumulated in plants that received high and medium dose of UV-C treatments with higher lipoxygenase and alcohol dehydrogenase activities. In treated samples, the activity of the antioxidant enzymes catalase and peroxidase was inhibited, resulting in a reduced antioxidant capacity and higher lipid peroxidation. Simultaneously, jasmonic acid level was 74% higher in the high-dose group while abscisic acid content was more than 12% lower in both the medium and high-dose UV-C treated samples. These results indicated that pre-harvest UV-C treatment stimulated the biosynthesis of fatty acid-derived VOCs in strawberry leaf tissue by upregulating the activity of enzymes of the LOX biosynthetic pathway and downregulating antioxidant enzyme activities. It is further suggested that the mechanisms underlying fatty acid-derived VOCs biosynthesis in UV-C treated strawberry leaves are associated with UV-C-induced changes in phytohormone profiles" |
| Keywords: | Antioxidants/*metabolism/radiation effects Fragaria/metabolism/*radiation effects Fruit/growth & development Plant Growth Regulators/*metabolism/radiation effects Plant Leaves/metabolism/radiation effects *Ultraviolet Rays Volatile Organic Compounds/*meta; |
| Notes: | "MedlineXu, Yanqun Luo, Zisheng Charles, Marie Therese Rolland, Daniel Roussel, Dominique eng Germany 2017/09/18 J Plant Physiol. 2017 Nov; 218:265-274. doi: 10.1016/j.jplph.2017.09.002. Epub 2017 Sep 8" |
