针对分离自内蒙古自治区巴彦淖尔地区的3株形态一致的菌株BM-9、BM-12和BM-15进行鉴定并分析其抗马铃薯晚疫病菌活性。形态鉴定结果表明,三个菌株菌落形态呈透明或半透明状,颜色为乳白色或肉粉色,表面凸起,边缘光滑,出现完整菌膜,在涂...针对分离自内蒙古自治区巴彦淖尔地区的3株形态一致的菌株BM-9、BM-12和BM-15进行鉴定并分析其抗马铃薯晚疫病菌活性。形态鉴定结果表明,三个菌株菌落形态呈透明或半透明状,颜色为乳白色或肉粉色,表面凸起,边缘光滑,出现完整菌膜,在涂有大肠杆菌的培养基上培养6 d左右可观察到棕色颗粒状物质。细胞呈短杆状,(0.425~0.51)μm×(0.425~1.7)μm。16S r DNA序列分析表明,这三个菌株的16S r DNA序列同微枝形杆菌属(microvirga sp.)的序列相似度均达到98%以上。结合形态特征及16S r DNA序列分析结果,菌株BM-9、BM-12和BM-15属于微枝形杆菌属。三个菌株均有明显的溶大肠杆菌活性及不同程度的抗马铃薯晚疫病菌活性。其中菌株BM-9抗马铃薯晚疫病菌活性最强,平板对峙抑制距离为15 mm,菌丝的生长抑制率达到60%。本研究进一步加深了对微枝形杆菌属的了解,为未来微枝形杆菌属针对性的研究提供了一定的参考。展开更多
The toxic effects of benzo[α]pyrene （B[α]P） at different concentrations （0.1, 0.5, 1, 2.5 and 7.5 μgL^-1） on scallop （Chlamys farreri） immune system were studied. The results showed that B[α]P had significan...The toxic effects of benzo[α]pyrene （B[α]P） at different concentrations （0.1, 0.5, 1, 2.5 and 7.5 μgL^-1） on scallop （Chlamys farreri） immune system were studied. The results showed that B[α]P had significant toxic effects on the haemocyte counts, neutral red uptake, phagocytosis, bacteriolytic and antibacterial activity （P〈0.05）, while the seawater control and acetone control had no significant differences. The haemocyte counts, neutral red uptake, phagocytosis and bacteriolytic activity in all B[α]P treatment groups as well as antibacterial activity in groups of 0.5, 1, 2.5 and 7.5 μgL^-1·B[α]P decreased significantly （P〈0.05）. Some of these indices tended to be stable on the sixth day and others on the ninth day, and the indices showed clear time- and concentration-response to B[α]E Bactenolytic activity in 0.1 μgL^-1 B[α]P treatment group and antibacterial activity in 0.1 ggLl and 0.5 μgL^-1 B[α]P treatment groups increased at the beginning of exposure and reached their peaks on day 1 and day 6, respectively. Following that, both activities decreased gradually and became stable after day 9. When all the indices reached stability, they were significantly lower than those in control group （P〈0.05）, except for antibacterial activity in 0.1 μgLl B[α]P treatment group （P〉0.05）. Thus, B[α]P has evident toxic effects on scallop immune system, which supports the view that a relationship exists between pollution and lmmunomodulation in aquatic organisms.展开更多
文摘针对分离自内蒙古自治区巴彦淖尔地区的3株形态一致的菌株BM-9、BM-12和BM-15进行鉴定并分析其抗马铃薯晚疫病菌活性。形态鉴定结果表明,三个菌株菌落形态呈透明或半透明状,颜色为乳白色或肉粉色,表面凸起,边缘光滑,出现完整菌膜,在涂有大肠杆菌的培养基上培养6 d左右可观察到棕色颗粒状物质。细胞呈短杆状,(0.425~0.51)μm×(0.425~1.7)μm。16S r DNA序列分析表明,这三个菌株的16S r DNA序列同微枝形杆菌属(microvirga sp.)的序列相似度均达到98%以上。结合形态特征及16S r DNA序列分析结果,菌株BM-9、BM-12和BM-15属于微枝形杆菌属。三个菌株均有明显的溶大肠杆菌活性及不同程度的抗马铃薯晚疫病菌活性。其中菌株BM-9抗马铃薯晚疫病菌活性最强,平板对峙抑制距离为15 mm,菌丝的生长抑制率达到60%。本研究进一步加深了对微枝形杆菌属的了解,为未来微枝形杆菌属针对性的研究提供了一定的参考。
基金supported by Science and Technology Development Project of Qingdao,China (06-2-2-21-jch)
文摘The toxic effects of benzo[α]pyrene （B[α]P） at different concentrations （0.1, 0.5, 1, 2.5 and 7.5 μgL^-1） on scallop （Chlamys farreri） immune system were studied. The results showed that B[α]P had significant toxic effects on the haemocyte counts, neutral red uptake, phagocytosis, bacteriolytic and antibacterial activity （P〈0.05）, while the seawater control and acetone control had no significant differences. The haemocyte counts, neutral red uptake, phagocytosis and bacteriolytic activity in all B[α]P treatment groups as well as antibacterial activity in groups of 0.5, 1, 2.5 and 7.5 μgL^-1·B[α]P decreased significantly （P〈0.05）. Some of these indices tended to be stable on the sixth day and others on the ninth day, and the indices showed clear time- and concentration-response to B[α]E Bactenolytic activity in 0.1 μgL^-1 B[α]P treatment group and antibacterial activity in 0.1 ggLl and 0.5 μgL^-1 B[α]P treatment groups increased at the beginning of exposure and reached their peaks on day 1 and day 6, respectively. Following that, both activities decreased gradually and became stable after day 9. When all the indices reached stability, they were significantly lower than those in control group （P〈0.05）, except for antibacterial activity in 0.1 μgLl B[α]P treatment group （P〉0.05）. Thus, B[α]P has evident toxic effects on scallop immune system, which supports the view that a relationship exists between pollution and lmmunomodulation in aquatic organisms.
