Comparison on stress memory of two Hypnaceae moss species to haze  

两种灰藓科植物对雾霾胁迫记忆的比较研究

作　　者：Binyang Liu Xinru Zhang Gaoming Jiang 

机构地区：[1]College of Life Sciences,Hebei Normal University,Shijiazhuang 050024,China [2]State Key Laboratory of Vegetation and Environment Change,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China

出　　处：《Journal of Plant Ecology》2024年第6期49-60,共12页植物生态学报(英文版)

基　　金：supported by the National Science for Youth Foundation(No.31500404);China Postdoctoral Science Foundation(No.2015M571155);Science and Technology Project of Hebei Education Department(No.QN2019194).

摘　　要：Industrialization and the rapid growth of economies have caused severe environmental pollution,which might impact the survival of sensitive species.In this study,we investigated the defense responses of two common mosses with varying anti-haze capacities,Hypnum callichroum and Homomallium incurvatum,in response to simulated haze pollution.Photoprotection and antioxidant mechanisms of both mosses were measured immediately after the first exposure to the haze treatment,followed by the initial recovery stage and again after exposure to secondary stress and secondary recovery.Haze exposure caused severe oxidative stress and photodamage in both H.callichroum and H.incurvatum.Metabolic processes such as photorespiration,the ascorbate-glutathione cycle and secondary metabolism-which play roles in defense responses-were significantly activated in both moss species after haze treatment.During the recovery following haze stress,H.callichroum exhibited a significant stress memory response,as evidenced by the greater accumulation of several memory substances,including xanthophylls and phenolic acids.However,H.incurvatum did not exhibit a strong stress memory response,which might explain its relatively inferior anti-haze capacity in the natural environment.随着工业化进程的加快和经济的快速增长,环境污染问题日趋严重,这可能会对敏感物种的生存造成威胁。本文选择了两种常见且具有不同抗雾霾能力的灰藓科植物:尖叶灰藓(Hypnum callichroum)和毛灰藓(Homomallium incurvatum),研究其对模拟雾霾污染的防御机制。实验共分第一次雾霾处理、第一次恢复、第二次雾霾处理及第二次恢复等4个阶段,并在每个阶段结束后立即对两种苔藓的光保护和抗氧化机制进行测定。研究结果表明:雾霾处理会导致尖叶灰藓和毛灰藓产生严重的氧化胁迫和光损伤。两种苔藓光呼吸、抗坏血酸-谷胱甘肽循环和酚类次生代谢等机制均在雾霾处理后被显著激活,表明这些机制在植物抗雾霾中发挥了重要作用。在雾霾处理后的恢复过程中,尖叶灰藓表现出明显的胁迫记忆机制,包括叶黄素和酚酸在内的几种记忆物质在此过程中均积累显著。然而,毛灰藓并没有表现出明显的胁迫记忆反应,这或许是它在自然环境中对雾霾污染的抗性相对较差的原因。

关 键 词：HAZE stress memory environmental pollution MOSS resistance 

分 类 号：Q945.78[生物学—植物学]