Page 74 - 《广西植物》2023年第11期
P. 74
2 0 3 4 广 西 植 物 43 卷
(1. Institute of Marine Drugsꎬ Guangxi University of Chinese Medicineꎬ Nanning 530200ꎬ Chinaꎻ 2. Guangxi Key Laboratory of Chinese Medicine
Foundation Researchꎬ Guangxi Scientific Experimental Center of Traditional Chinese Medicineꎬ Guangxi University of Chinese Medicineꎬ Nanning
530200ꎬ Chinaꎻ 3. Guangxi Key Laboratory of Marine Drugsꎬ Guangxi University of Chinese Medicineꎬ Nanning 530200ꎬ China )
Abstract: In order to explore the antibacterial activity of endophytic fungi derived from Aegiceras corniculatumꎬ
antibacterial activity of ferment extract of endophytic fungi was used as evaluation index to screen active strainsꎬ the
chemical constituents were separated on the basis of bioactivity ̄guiding method combined with various chromatographic
techniques and identified by spectral technique together with comparison with literature dataꎬ and the antibacterial
activity of pure compounds was determined by microplate method. The results were as follows: (1) Sixteen taxa of
endophytic fungi isolated from A. corniculatum were distributed in 2 classesꎬ 7 ordersꎬ 10 families and 10 genera.
Fusarium was dominant genus. The ferment extract of endophytic fungi GXIMD02029 and GXIMD02039 displayed
different levels of inhibitory effects on Bacillus subtilisꎬ Staphylococcus epidermidisꎬ methicillin ̄resistant S. aureusꎬ
Micrococcus luteusꎬ Actinomyces viscosityꎬ and Staphylococcus aureus when that of GXIMD02038 against methicillin ̄
resistant S. aureusꎬ Micrococcus luteusꎬ and Staphylococcus aureus. (2) Seven pure compounds were isolated from
endophytic fungi Phomopsis sp. GXIMD02029 and identified as (15R) ̄acetoxydothiorelone A (1)ꎬ cytosporone B (2)ꎬ
pestalotiopsone H (3)ꎬ pestalotiopsone B ( 4)ꎬ p ̄hydroxybenzaldehyde ( 5)ꎬ p ̄hydroxybenzoic acid ( 6)ꎬ N ̄( 2 ̄
phenylethyl)acetamide (7). (3) Compounds 1 and 2 showed different levels of antibacterial effects. Compound 1
exhibited inhibitory effect on Bacillus subtilisꎬ Staphylococcus epidermidis and methicillin ̄resistant S. aureus with MIC
 ̄1  ̄1
value of 15.625 mgmL ꎬ Micrococcus luteus and Actinomyces viscosity with MIC value of 7.812 5 mgmL ꎬ and
 ̄1
Staphylococcus aureus with MIC value of 31.25 mgmL . Compound 2 displayed inhibitory effect on Micrococcus luteus
 ̄1
with MIC value of 62.5 mgmL ꎬ Bacillus subtilisꎬ Staphylococcus epidermidisꎬ methicillin ̄resistant S. aureus and
 ̄1
Actinomyces viscosity with MIC values of 125 mg mL ꎬ and Staphylococcus aureus with MIC value of 250 mg
 ̄1
mL . Three active strains were reported in the project. It is reported that Compound 1 shows the antibacterial activity for
the first time. The result provides the basis for the antibacterial values of endophytic fungi of Aegiceras corniculatum.
Key words: Aegiceras corniculatumꎬ endophytic fungiꎬ antibacterial activityꎬ chemical constituentsꎬ Phomopsis
桐花树( Aegiceras corniculatum) 是红树林的重 pestalol C 还对多个肿瘤细胞有细胞毒活性( Sun et
要组成之一ꎬ从中分离得到的甾醇、三萜、醌类、黄 al.ꎬ 2014)ꎮ 内生真菌 Fusarium incarnatum 从桐花
酮、有机酸等化合物具有抗炎镇痛、抗肿瘤、抗菌、 树内果实分离得到ꎬ其代谢产物中的 3 个结构独
抗氧化、降血糖、抗疟疾、止泻、保肝、抗凝血等药 特生物碱对 HUVEC、K ̄562 和 HeLa 细胞系有较弱
理活性(田晓萌等ꎬ2017ꎻBibi et al.ꎬ 2019)ꎮ 这些 的抗增殖和细胞毒活性(Ding et al.ꎬ 2012)ꎮ 蒽醌
活性物质的提取需要砍伐大量的桐花树ꎬ易破坏 二聚体衍生物 alterporriols K-M 从桐花树内生真菌
红树林生态系统ꎮ 为了保护且合理利用桐花树的 Alternaria sp. ZJ9 ̄6B 分离得到ꎬalterporriols K 和 L
药用资源ꎬ桐花树内生菌及其代谢产物研究在近 对肿瘤细胞有一定的细胞毒作用( Huang et al.ꎬ
年来受到了更多的关注ꎮ 李菲等(2020) 报道桐花 2011)ꎮ 多个特特拉姆酸和聚酮类化合物从桐花
树内生细菌具有抗血栓作用ꎬ是发掘溶血栓活性 树内生真菌 Penicillium sp. 中分离ꎬ有较好的抑制
物质的资源ꎮ 目前活性代谢产物多来源于桐花树 肿瘤细胞增殖作用(Lin et al.ꎬ 2008aꎬ b)ꎮ 虽然桐
内生真菌ꎬ主要包括生物碱、蒽醌、聚酮类、酚类 花树内生真菌有较高的药用开发潜能ꎬ但关于其
等ꎬ它们在抗病毒、抗肿瘤等方面具有潜在的价值 抗菌化学成分报道较少ꎮ
(Wang et al.ꎬ 2014ꎻCadamuro et al.ꎬ 2021)ꎮ 从桐 本研究以采自广西茅尾海康熙岭红树林自然
花树内生真菌 Pestalotiopsis sp.中分离到的含有不 保护区的桐花树为材料ꎬ分离其中的内生真菌ꎬ以
饱和脂肪链的苯酚和 苯 甲 醛 类 化 合 物 ( pestalols 内生真菌发酵产物的抑菌活性为指标筛选活性菌
A-E)和甾醇化合物对甲型流感病毒亚型( H3N2) 株ꎬ通过抑菌活性导向分离活性菌株的次级代谢
和甲 型 病 毒 ( H1N1) 有 抑 制 作 用ꎬ pestalol B 和 产物ꎬ采用微孔板法测定次级代谢产物的抗菌作