文献类型：期刊文献

英文题名：Potential of a halophyte-associated endophytic fungus for sustaining Chinese white poplar growth under salinity

作者：Pan, Xueyu[1,2] Qin, Yuan[2,3] Yuan, Zhilin[1,2]

第一作者：Pan, Xueyu

通信作者：Yuan, ZL[1];Yuan, ZL[2]

机构：[1]Chinese Acad Forestry, Inst Subtrop Forestry, Hangzhou, Zhejiang, Peoples R China;[2]Chinese Acad Forestry, State Key Lab Tree Genet & Breeding, Beijing, Peoples R China;[3]Chinese Acad Sci, Inst Genet & Dev Biol, Beijing, Peoples R China

年份：2018

卷号：76

期号：2

起止页码：109-116

外文期刊名：SYMBIOSIS

收录：;Scopus(收录号：2-s2.0-85045149831);WOS:【SCI-EXPANDED(收录号:WOS:000444580100003)】；

基金：This work was financially supported by the National Natural Science Foundation of China (No. 31370704 and No. 31722014) and the Fundamental Research Funds for the Central Non-profit Research Institution of RISF-CAF (RISF2013005). We greatly appreciated Dr. Shengqing Shi (Institute of Forestry, Chinese Academy of Forestry, Beijing) for providing the poplar clone materials. We would like to extend our sincerest thanks and great appreciation to Dr. Jessy Labbe, Oak Ridge National Labor, for his useful suggestions and technical assistance.

语种：英文

外文关键词：Poplar; Fungal endophytes; Salinity; Symbiosis

摘要：Endophyte-mediated plant growth and stress tolerance have been increasingly acknowledged. Our knowledge of functions of endophytes from saline environments, however, is currently scant indeed. In this work, we found that an endophytic ascomycetous Curvularia sp. isolated from a halophytic plant Suaeda salsa was able to establish beneficial symbiosis with poplar (Populus tomentosa). Microscopic staining technique confirmed that the Curvularia sp. can penetrate the poplar roots after two week inoculation and readily form sclerotia-like structures and monilioid hyphal cells in root hair and/or cortex cells, both intercellularly and intracellularly. This implied that this fungus can be referred to as a dark septate endophyte. Pot experiments revealed that Curvularia sp. significantly promoted the poplar growth and resulted in increased production of the antioxidant enzymes, particularly the superoxide dismutase (SOD) and ascorbate peroxidase (APX) under salinity stress condition. The presence of Curvularia sp. also enhanced chlorophyll a, b and proline contents in leaves, although not all differences were significant. Compared to the non-inoculated plants, the photosystem II-based electron transport rate (ETR), actual quantum yield in the light-adapted steady state (phi PSII) and photochemical quenching values (qP) was significantly higher in colonized plants, despite there were only slight differences in the values of the maximum quantum yield in the dark-adapted state (F-v/F-m) and in the light-adapted sate (F'(v)/F'(m)). Collectively, our data supports the evidence of the ability of Curvularia sp. to alleviate the adverse effects of salinity stress on poplar growth and highlights the potential use of endophytes from extreme conditions as novel probiotics in improving salt tolerance of tree seedlings.