滸苔(Ulva prolifera)共附生細(xì)菌群落結(jié)構(gòu)分析的方法學(xué)創(chuàng)新與CFB類群的初步研究
[Abstract]:The large green tide of Huang Hai over the years is composed of a single ecotype of Enteromorpha enteromorpha, indicating that its biological characteristics are one of the important causes of green tide outbreak. Algae co-epiphytic bacteria are closely involved in the host nutrient absorption, morphogenesis and other key processes, which provides a new perspective for the genetic traceability and outbreak mechanism of Huang Hai green tide. The specificity of endophytic bacteria and host is more stable than that of epiphytic bacteria, so it is necessary to carry out diversity analysis, but the methodological basis of related studies has not been established. In this paper, using 16s rDNA universal primers, the community structure of coepiphytic bacteria of floating and stationary Enteromorpha enteromorpha was compared and analyzed. It was found that the following laws and question: 1) were found to be at the level of phylum and family. There were significant differences between floating and metaplastic populations (2) the functional groups such as CFB and floating fungi were found, but CFB was lack of functional verification method, and the proportion of floating fungi was significantly different from that in literature. It is suggested that the difference between endophytic and epiphytic bacteria should be studied. 3) chloroplast DNA of Enteromorpha enteromorpha has a serious effect on amplification and primer optimization or design should be carried out. In view of the above methodological bottlenecks, we have developed a highly efficient method of eliminating epiphytic bacteria thoroughly by shaking together with quartz sand and enteromorpha with specific particle size by comparing a dozen disinfection methods such as chemistry, physics and enzymatic hydrolysis, and optimizing the parameters of DGGE. The new method has little effect on endophytic bacteria and can be used to analyze the difference of endophytic bacteria community structure. In order to eliminate the serious influence of the 16s rDNA homologous sequence encoded by algae chloroplast on the analysis of endophytic community structure, two primer optimization schemes were established: one was to optimize the existing 799F primers from three aspects: primer design, hot start and annealing temperature. By comparing the 16s homologous sequences of chloroplasts with 31 bacteria species, we found the only double base difference site located in highly conserved region of Enteromorpha enteromorpha by reducing the proportion of chloroplast products derived from chloroplast and revealing the principle of optimization, and comparing the 16s homologous sequences of chloroplasts with 31 bacterial families. A new primer 1525 Rwas designed and sequenced. Green tide Enteromorpha enteromorpha is highly branched and easy to float, which is a significant morphological difference from Dingsheng population. CFB bacteria are important functional groups involved in the morphogenetic (MG) of Enteromorpha enteromorpha. In this paper, CFB bacteria specific primers were used to analyze and compare 8 floating and stationary populations of Enteromorpha enteromorpha. The culturable CFB strains were isolated and identified. The aseptic development test system of Enteromorpha margin was established by using antibiotic method, which will be used to verify the MG function of the strains. In this paper, the key methods, such as the optimization and design of 16s primer for selective removal of epiphytic bacteria and the construction of aseptic development experiment system, were established for the subsequent development of Enteromorpha enteromorpha. The difference analysis of epiphytic community structure and the examination of functional groups lay the necessary methodological foundation.
【學(xué)位授予單位】:中國科學(xué)院研究生院(海洋研究所)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:X55
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