三种江蓠共附生细菌多样性及抑菌活性分析

Diversity of epiphytic bacteria of three species of Gracilaria and their bacteriostatic activities

  • 摘要: 【目的】研究广西北部湾涠洲岛海域3种江蓠可培养共附生细菌多样性及其代谢产物的抑菌活性,为该海域海藻共附生细菌的开发利用及新型生物杀菌剂的研发提供参考依据。【方法】经稀释涂布法后观察分析3种江蓠共附生细菌的菌落形态及其分布,基于16S rRNA序列对江蓠共附生细菌的物种多样性进行分析,并利用纸片扩散法对其抑菌活性进行初步筛选。【结果】从广西北部湾涠洲岛海域的江蓠、扁江蓠和集团江蓠中共分离获得28株可培养的共附生菌株,隶属于4门13科15属(芽孢杆菌属、葡萄球菌属、弧菌属、冷杆菌属、交替单胞菌属、假交替单胞菌属、赤杆菌属、副球菌属、考克氏菌属、微球菌属、红小梨形菌属、Kytococcus sp.、Dermacoccus sp.、Maribacter sp.和Cobetia sp.)。有5株共附生菌株的代谢产物对番木瓜炭疽病原菌或荔枝炭疽病原病菌表现出较好的拮抗作用,其中,菌株GXS0044、GXS0017和GXS0035的代谢产物对荔枝炭疽病菌有较好的抑制作用(抑菌圈直径分别为15.0、14.5和15.5 mm),菌株GXS0023和GXS0031的代谢产物则对番木瓜炭疽病菌有较好的抑制作用(抑菌圈直径分别为15.0和17.0 mm)。【结论】广西北部湾海域的江蓠共附生细菌较丰富,其代谢产物活性各不相同,因此从海藻中寻找具有抗农业病原菌的微生物将成为研究抗农业病原菌杀菌剂的新方向。

     

    Abstract: ObjectiveThe present study was conducted to explore the diversity of culturable epiphytic bacteria of three species of Gracilaria and bacteriostatic activities of their metabolits in sea area around Weizhoudao Island, Beibu Gulf, Guangxi, in order to provide reference for development of these epiphytic bacteria in the sea area and new biological fungicides. MethodDilution coating method was applied to observe colonial morphology and distribution of epiphytic bac-teria of three species of Gracilaria. Diversity of the epiphytic bacteria of Gracilaria was analyzed based on 16S rRNA se-quence and their bacteriostatic activities were screened by disc diffusion method. ResultTwenty-eight strains were ex-tracted from Gracilaria verrucosa, Gracilaria textorii and Gracilaria glomerata in Beibu Gulf, Guangxi belonged to four subclasses, thirteen families and fifteen genuses(Bacillus sp.; Staphylococcus sp.; Vibrio sp.; Psychrobacter sp.; Al-teromonas sp.;Pseudoalteromonas sp.; Erythrobacter sp.; Paracoccus sp.; Kocuria sp.; Micrococcus sp.; Rhodopirellula sp.; Kytococcus sp.; Dermacoccus sp.; Maribacter sp.; Cobetia sp.). The metabolites of five strains showed obvious an-tagonistic effects against Colletrichum gloeosporiode M2 or C. gloeosporiodes Lz2. Metabolites of strains GXS0044, GXS0017 and GXS0035 showed sound inhibition effects towards C. gloeosporiodes Lz2(antibacterial circle diameters were 15.0, 14.5 and 15.5 mm, respectively). Metabolites of strains GXS0023 and GXS0031 showed obvious inhibition effects towards C. gloeosporiode M2(antibacterial circle diameters were 15.0 and 17.0 mm, respectively). ConclusionThere are resource-ful epiphytic bacteria of Gracilaria and their metabolites activities are different. Therefore, searching for pathogens that are resistant to agricultural diseases from seaweeds will become a new direction in development of new pathogen fungicides that against agricultural diseases.

     

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