Distribution and generic composition of culturable marine actinomycetes from the sediments of Indian continental slope of Bay of Bengal

从孟加拉的海湾的大陆坡沉积的放射菌类人口被学习。样品在 2004 在 FORV Sagar Sampada 的二次航行期间被收集(5 月 6 月) 并且 2005 (我的) 分别地从 11 横断(每横断有 ca。200 m， 500 m，和 1 000 m 深度驻扎) 。overlying 的物理化学的参数流水，并且沉积样品也被记录。放射菌类人口分别地在二巡航期间从 5.17 ～ 51.94 CFU/g 干燥沉积重量和 9.38 ～ 45.22 CFU/g 干燥沉积重量。没有放射菌类殖民地在 1 000 m 深度从车站被孤立。双向方差分析在车站之中显示出重要变化(ANOVA 双向， P < 0.05 ) ，但是没有意义在二巡航之间被发现(ANOVA 双向， P < 0.05 ) 。在在在两巡航的 500 m 深度的车站的人口比有统计上不足道的差别的 200 个 m 深度车站的高(ANOVA 双向， P > 0.05 ) 。三个放射菌类类被识别。Streptomyces 被发现是在两个的统治的那巡航，由 Micromonospora，和放线菌列在后面。Streptomyces 的孢子孤立在螺线孢子链显示出丰富。孢子表面是光滑的。揭示的多重回归分析影响物理化学的因素是沉积氢指数，沉积温度， TOC，孔，咸度，和压力。在现在的学习使用的媒介与海水被准备。因此，他们可以代表本土的海洋的植物群并且为改编否认陆地流量马车的理论进海到海水和沉积的咸度。

Actinomycetes population from continental slope sediment of the Bay of Bengal was studied. Samples were collected during two voyages of FORV Sagar Sampada in 2004 （May-June） and 2005 （July） respectively from 11 transects （each transect had ca. 200 m, 500 m, and 1 000 m depth stations）. The physicochemical parameters of overlying water, and sediment samples were also recorded. The actinomycete population ranged from 5.17 to 51.94 CFU/g dry sediment weight and 9.38 to 45.22 CFU/g dry sediment weight during the two cruises respectively. No actinomycete colony was isolated from stations in 1 000 m depth. Two-way analysis of variance showed significant variation among stations （ANOVA two-way, P〈0.05）, but no significance was found between the two cruises （ANOVA two-way, P〈0.05）. Populations in stations in 500 m depth in both cruises were higher than that of 200 m depth stations with statistically insignificant difference （ANOVA two-way, P〉0.05）. Three actinomycetes genera were identified. Streptomyces was found to be the dominating one in both the cruises, followed by Micromonospora, and Actinomyces. The spore of Streptomyces isolates showed the abundance in spiral spore chain. Spore surface was smooth. Multiple regression analysis revealed that the influencing physico-chemical factors were sediment pH, sediment temperature, TOC, porosity, salinity, and pressure. The media used in the present study was prepared with seawater. Thus, they may represent an autochthonous marine flora and deny the theory of land runoff carriage into the sea for adaptation to the salinity of the seawater and sediments.