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UVB辐射在Desv.中诱导的抗氧化反应

Antioxidant Responses Induced by UVB Radiation in Desv.

作者信息

Köhler Hans, Contreras Rodrigo A, Pizarro Marisol, Cortés-Antíquera Rodrigo, Zúñiga Gustavo E

机构信息

Laboratorio de Fisiología y Biotecnología Vegetal, Departamento de Biología, Facultad de Química y Biología - Centro para el Desarrollo de la Nanociencia y Nanotecnología, Universidad de Santiago de ChileSantiago, Chile.

出版信息

Front Plant Sci. 2017 May 31;8:921. doi: 10.3389/fpls.2017.00921. eCollection 2017.

DOI:10.3389/fpls.2017.00921
PMID:28620407
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5449467/
Abstract

Desv. is one of two vascular plants that live in the Maritime Antarctic Territory and is exposed to high levels of ultraviolet-B (UVB) radiation. In this work, antioxidant physiology of was studied in response to UVB induced oxidative changes. Samples were collected from Antarctica and maintained culture during 2 years. Plants were sub-cultured in a hydroponic system and exposed to 21.4 kJ m day, emulating summer Antarctic conditions. Results showed rapid and significant increases in reactive oxygen species (ROS) at 3 h, which rapidly decreased. No dramatic changes were observed in photosynthetic efficiency, chlorophyll content, and level of thiobarbituric acid reactive species (MDA). The enzymatic (superoxide dismutase, SOD and total peroxidases, POD) and non-enzymatic antioxidant activity (total phenolic) increased significantly in response to UVB treatment. These findings suggest that tolerance of to UVB radiation could be attributed to its ability to activate both enzymatic and non-enzymatic antioxidant systems.

摘要

Desv.是生活在南极海洋区域的两种维管植物之一，且暴露于高水平的紫外线B（UVB）辐射下。在这项研究中，研究了Desv.在应对UVB诱导的氧化变化时的抗氧化生理特性。样本从南极洲采集，并在两年内保持培养状态。将植物在水培系统中进行继代培养，并暴露于21.4千焦/平方米·天的条件下，模拟南极夏季的环境。结果显示，在3小时时活性氧（ROS）迅速且显著增加，随后迅速下降。光合效率、叶绿素含量和硫代巴比妥酸反应性物质（MDA）水平未观察到显著变化。响应UVB处理，酶促抗氧化活性（超氧化物歧化酶，SOD和总过氧化物酶，POD）和非酶促抗氧化活性（总酚类）显著增加。这些发现表明，Desv.对UVB辐射的耐受性可能归因于其激活酶促和非酶促抗氧化系统的能力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/78ba/5449467/5156c9bf9adb/fpls-08-00921-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/78ba/5449467/343c9420660c/fpls-08-00921-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/78ba/5449467/f0621e4d90f7/fpls-08-00921-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/78ba/5449467/4a4ea44c6069/fpls-08-00921-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/78ba/5449467/8543ecce0d06/fpls-08-00921-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/78ba/5449467/5156c9bf9adb/fpls-08-00921-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/78ba/5449467/343c9420660c/fpls-08-00921-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/78ba/5449467/f0621e4d90f7/fpls-08-00921-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/78ba/5449467/4a4ea44c6069/fpls-08-00921-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/78ba/5449467/8543ecce0d06/fpls-08-00921-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/78ba/5449467/5156c9bf9adb/fpls-08-00921-g005.jpg

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