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首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Effect of Temperature and Light on Growth of and Photosynthesis by Synechococcus Isolates Typical of Those Predominating in the Octopus Spring Microbial Mat Community of Yellowstone National Park
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Effect of Temperature and Light on Growth of and Photosynthesis by Synechococcus Isolates Typical of Those Predominating in the Octopus Spring Microbial Mat Community of Yellowstone National Park

机译：温度和光照对黄石国家公园八达通春季微生物垫群落中典型菌群的典型球菌的生长和光合作用的影响

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Previous molecular analysis of the Octopus Spring cyanobacterial mat revealed numerous genetically distinct 16S rRNA sequences from predominant Synechococcus populations distantly related to the readily cultivated unicellular cyanobacterium Synechococcus lividus. Patterns in genotype distribution relative to temperature and light conditions suggested that the organisms contributing these 16S rRNA sequences may fill distinct ecological niches. To test this hypothesis, Synechococcus isolates were cultivated using a dilution and filtration approach and then shown to be genetically relevant to natural mat populations by comparisons of similarities of 16S rRNA genes and 16S-23S internal transcribed spacer (ITS) regions. Most isolates were identical or nearly identical at both loci to predominant mat genotypes; others showed 1- to 2-nucleotide differences at the 16S rRNA locus and even greater difference in ITS sequences. Isolates with predominant mat genotypes had distinct temperature ranges and optima for growth that were consistent with their distributions in the mat. Isolates with genotypes not previously detected or known to be predominant in the mat exhibited temperature ranges and optima that were not representative of predominant mat populations and also grew more slowly. Temperature effects on photosynthesis did not reflect temperature relations for growth. However, the isolate with the highest temperature optimum and upper limit was capable of performing photosynthesis at a higher temperature than other isolates. Growth rate and photosynthetic responses provided evidence for light acclimation but evidence of, at best, only subtle light adaptation.
机译：先前对章鱼春季蓝细菌垫的分子分析显示，与主要与容易培养的单细胞蓝藻Syechococcus lividus密切相关的主要Syechococcus种群具有许多遗传上不同的16S rRNA序列。基因型分布相对于温度和光照条件的模式表明，贡献这些16S rRNA序列的生物可能填补了不同的生态位。为了验证该假设，使用稀释和过滤方法培养了球菌分离株，然后通过比较16S rRNA基因和16S-23S内部转录间隔区（ITS）区域的相似性，证明与自然垫种群具有遗传相关性。大多数分离株在两个基因座上都与主要垫基因型相同或几乎相同。其他人在16S rRNA位点显示1至2个核苷酸的差异，甚至在ITS序列中差异更大。具有主要垫基因型的分离物具有不同的温度范围和最适生长，这与其在垫中的分布相一致。具有以前未检测到或已知在席子中占主导地位的基因型的分离株显示的温度范围和最佳值不能代表席子的优势种群，并且生长速度也较慢。温度对光合作用的影响并未反映出生长的温度关系。然而，具有最高温度最佳值和上限的分离株能够在比其他分离株更高的温度下进行光合作用。生长速度和光合作用的反应为光的适应提供了证据，但充其量只是微妙的光适应性的证据。

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