干旱区生态环境知识资源中心(Arid): Responses of antioxidant defense system of epilithic mosses to drought stress in karst rock desertified areas

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	Responses of antioxidant defense system of epilithic mosses to drought stress in karst rock desertified areas
	Zhang Xianqiang; Zhao Yuzhong; Wang Shijie
来源期刊	Acta Geochimica
ISSN	2096-0956
出版年	2017
卷号	36 期号:2 页码:205-212
英文摘要	Barbula fallax Hedw., Erythrodontium julaceum (Schwaegr.) Par., and Bryum argenteum Hedw. are typical rock mosses growing on rocks in different terrestrial habitats. In this study, B. fallax and E. julaceum, which are epilithic mosses growing in rock desertification in Guizhou, China, were used as ecophysiological mosses in a combination of field investigations and laboratory experiments. We also investigated the reference moss B. argenteum, which is a widely distributed moss in habitats with soil as substrate. Our research focused on the response of the antioxidant defense system of epilithic mosses to drought stress. Most antioxidant defense indicators increased initially, then declined at later stages of drought stress. In contrast, the carotenoid content increased constantly. In addition, there was an initial increase (albeit variable) in relative membrane permeability, with this parameter showing a parabolic trend in all of the epilithic mosses. Among the three species, E. julaceum demonstrated the strongest resistance followed by B. fallax and then by B. argenteum. The epilithic mosses displayed stronger resistance compared to the native mosses; the increase in O_2~(-·) content and other reactive oxygen species (ROS) at the early stage of drought stress induced the enzymatic and non-enzymatic scavenging systems to sequester ROS. Moreover, the radical scavenging ability and strong drought tolerance was maintained. The longterm growth of bryophyte under drought conditions in a karst environment can help eliminate the intense response of mosses to drought stress as they adapt.
英文关键词	Rocky desertification of karst Epilithic mosses Antioxidase system Drought stress
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:6028234
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335840
作者单位	Zhang Xianqiang, Anshun University, State Key Laboratory of Environmental Geochemistry, Anshun, Guizhou 560000, China.; Zhao Yuzhong, Guizhou Minzu University, Guiyang, Guizhou 550025, China.; Wang Shijie, Institute of Geochemistry, Chinese Academy of Sciences, State Key Laboratory of Environmental Geochemistry, Guiyang, Guizhou 550081, China.
推荐引用方式 GB/T 7714	Zhang Xianqiang,Zhao Yuzhong,Wang Shijie. Responses of antioxidant defense system of epilithic mosses to drought stress in karst rock desertified areas[J],2017,36(2):205-212.
APA	Zhang Xianqiang,Zhao Yuzhong,&Wang Shijie.(2017).Responses of antioxidant defense system of epilithic mosses to drought stress in karst rock desertified areas.Acta Geochimica,36(2),205-212.
MLA	Zhang Xianqiang,et al."Responses of antioxidant defense system of epilithic mosses to drought stress in karst rock desertified areas".Acta Geochimica 36.2(2017):205-212.