生物多样性 ›› 2024, Vol. 32 ›› Issue (7): 23498.  DOI: 10.17520/biods.2023498  cstr: 32101.14.biods.2023498

• 研究报告: 微生物多样性 • 上一篇    下一篇

北京地区油松与大叶黄杨叶际表生真菌多样性及群落组成

崔玉进(), 李婉莹, 周青青, 赵恒, 吴芳*()(), 员瑗*()()   

  1. 北京林业大学生态与自然保护学院, 林木资源高效生产全国重点实验室, 北京 100083
  • 收稿日期:2023-12-28 接受日期:2024-05-06 出版日期:2024-07-20 发布日期:2024-06-12
  • 通讯作者: *E-mail: fangwubjfu2014@bjfu.edu.cn; yuanyuan1018@bjfu.edu.cn
  • 基金资助:
    中央高校基本科研业务费专项资金(QNTD202307)

Diversity and community composition of epiphytic fungi in the phyllosphere of Pinus tabuliformis and Euonymus japonicus in Beijing, northern China

Yujin Cui(), Wanying Li, Qingqing Zhou, Heng Zhao, Fang Wu*()(), Yuan Yuan*()()   

  1. State Key Laboratory of Efficient Production of Forest Resources, School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083
  • Received:2023-12-28 Accepted:2024-05-06 Online:2024-07-20 Published:2024-06-12
  • Contact: *E-mail: fangwubjfu2014@bjfu.edu.cn; yuanyuan1018@bjfu.edu.cn
  • Supported by:
    Central Universities(QNTD202307)

摘要:

叶际真菌在影响植物健康和促进生物地球化学循环等方面发挥着重要作用。然而, 目前还缺乏北京城市绿化树木叶际表生真菌多样性与群落组成的研究。本研究以北京常见的绿化树木油松(Pinus tabuliformis)与大叶黄杨(Euonymus japonicus)为研究对象, 对市中心向北的4个采样点(安定门地区、和平街地区、亚运村地区和北七家地区), 及4个月份(一月、四月、七月和十一月)的树木叶际表生真菌通过高通量测序技术进行多样性及群落组成研究。结果表明, 油松与大叶黄杨分别得到2,051和1,970个扩增子变异特征序列(ASVs), 其中座囊菌纲、锤舌菌纲和银耳纲是优势菌纲。不同地点间, 叶际表生真菌的α多样性指数由市中心向北呈现先降低后升高的变化趋势; 4个月份间, 油松的α多样性指数存在差异, 大叶黄杨则均为十一月最高。NMDS分析表明两种常绿树木间叶际表生真菌群落组成存在显著差异(ANOSIM, P = 0.001)。线性判别分析表明, 油松的差异指示属为短柄霉属(Aureobasidium)拟盾壳霉属(Paraconiothyrium)圆盘菌属(Orbilia)等7属, 大叶黄杨为白粉菌属(Erysiphe)链格孢属(Alternaria)黑孢霉属(Nigrospora)等7属。回归分析表明, 平均降水与油松叶际表生真菌丰富度呈显著正相关关系, 与大叶黄杨叶际表生真菌丰富度呈显著负相关。通过网络分析将油松中的空泡茎点霉属(Vacuiphoma)和大叶黄杨中的空泡茎点霉属(Vacuiphoma)、木拉克属(Mrakia)、弯孢属(Curvularia)、白粉菌属(Erysiphe)确定为核心节点菌属。真菌群落功能预测得出腐生功能类群和病理功能类群分别是油松和大叶黄杨叶际表生真菌的主要类群。深入研究绿化树木的叶际表生真菌多样性及其作用有助于在未来城市绿化管理中更科学地发挥叶际表生真菌的生态功能。

关键词: 叶际表生真菌, 城市绿化树木, Illumina MiSeq测序, 真菌多样性, 核心菌群, 网络分析

Abstract

Aims Phyllosphere fungi play crucial roles in influencing plant health and contributing to biogeochemical cycling. This study aims to investigate the diversity and community structure of epiphytic fungi in the phyllosphere of two most common evergreen trees in Beijing, namely Pinus tabuliformis and Euonymus japonicus to provide the basic data for management of urban evergreen trees.

Methods In this study, we collected leaves samples from four sites in Beijing (Andingmen area, Hepingjie area, Yayuncun area, and Beiqijia area) during four seasons (January, April, July and November) and analyzed the diversity and community composition of epiphytic fungi using high-throughput sequencing technique.

Results A total of 2,051 amplicon sequence variants (ASVs) was obtained from epiphytic fungi on P. tabuliformis while 1,970 ASVs were obtained from those on E. japonicus. The epiphytic fungi were dominated by Dothideomycetes, Leotiomycetes, and Tremellomycetes. Alpha diversity indices (Shannon diversity index, Chao1 richness index, Pielou evenness index) for epiphytic fungi varied among sampling plots but consistently showed lowest values at Hepingjie. The diversity showed a decreasing and then increasing trend from the center to north of the city. The three alpha diversity indices of fungi in P. tabuliformis varied in different months, while November had the highest index of fungi in E. japonicus during the four seasons. Result of non-metric multidimensional scaling revealed significant differences between composition patterns of epiphytic fungal communities associated with these two species (ANOSIM, P= 0.001). Linear discriminant analysis effect size identified significant biomarkers specific to each studied species, seven genera (e.g., Aureobasidium, Paraconiothyrium, Orbilia) served as biomarkers for P. tabuliformis, while seven fungal genera (e.g., Erysiphe, Alternaria, Nigrospora) represented biomarkers for E. japonicus. Regression analyses showed that mean precipitation was significantly and positively correlated with the abundance of epiphytic fungi in P. tabuliformis, and significantly and negatively correlated with the abundance of epiphytic fungi in E. japonicus. Network analysis identified the dominant core fungal genera for E. japonicus are Vacuiphoma, Mrakia, Curvularia, and Erysiphe, whereas Vacuiphoma was single core fungal genus for P. tabuliformis. The main functional groups of epiphytic fungi in the phyllosphere of P. tabuliformis and E. japonicus were pathotrophic and saprotrophic, respectively.

Conclusion The results of this study indicate that there is a significant difference in the composition of the epiphytic fungi in the phyllosphere between the two evergreen trees species and there are some patterns in the α diversity changes of different sites and seasons. Plant leaf diseases are most severe in April and should be emphasized for prevention and control.

Key words: epiphytic fungi in the phyllosphere, urban greening trees, Illumina MiSeq sequencing, fungal diversity, core fungal communities, network analysis