Temperature‐dependent phagotrophy and phototrophy in a mixotrophic chrysophyte
Temperature‐dependent phagotrophy and phototrophy in a mixotrophic chrysophyte
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混合营养金藻植物中温度依赖性吞噬和光养
DOI：
10.1111/jpy.12405
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发表时间：
2016
影响因子：
2.9
通讯作者：
R. Sanders
中科院分区：
文献类型：
--
作者：
S. D. Princiotta;B. Smith;R. Sanders
研究了温度和光照对常见的淡水兼养型生物--社会甲藻（Dinobryonsociale）的放牧和光合作用的影响。测定了D. sociale适应温度为8，12，16和20°C，光合有效辐射光辐照度为25，66和130 μmol光子· m−2 · s−1，同时测量细菌摄入在所有温度下的中等和高光（66和130 μmol光子· m−2 · s−1）。在两种较高光照条件下，摄食率和光合作用率随温度升高而增加，在16°C时达到最大值，在20°C时下降。尽管光和温度对光合作用都有显着影响，但在任何给定温度下，中、高辐射下的噬菌作用均无显着差异。在最低光照条件下（25 μmol光子· m−2 · s−1），光合作用在所有温度下都保持较低且相对稳定。D.在8°C下，群居蜂的光合速率较低，但摄食速率没有下降，说明在低温下，食菌性活动可能占总碳收支的20%-30%。在营养改良培养基中的放牧实验表明，当溶解氮或磷减少时，这种混合营养体的摄食率增加。这项工作增加了我们的理解环境对兼养营养的影响。虽然非生物因素对纯异养生物和光养生物的食养和光养的影响已经得到了很好的研究，但对兼养生物的影响知之甚少。
The roles of temperature and light on grazing and photosynthesis were examined for Dinobryon sociale, a common freshwater mixotrophic alga. Photosynthetic rate was determined for D. sociale adapted to temperatures of 8, 12, 16, and 20°C under photosynthetically active radiation light irradiances of 25, 66, and 130 μmol photons · m−2 · s−1, with concurrent measurement of bacterial ingestion at all temperatures under medium and high light (66 and 130 μmol photons · m−2 · s−1). Rates of ingestion and photosynthesis increased with temperature to a maximum at 16°C under the two higher light regimes, and declined at 20°C. Although both light and temperature had a marked effect on photosynthesis, there was no significant difference in bacterivory at medium and high irradiances at any given temperature. At the lowest light condition (25 μmol photons · m−2 · s−1), photosynthesis remained low and relatively stable at all temperatures. D. sociale acquired the majority of carbon from photosynthesis, although the low photosynthetic rate without a concurrent decline in feeding rate at 8°C suggested 20%–30% of the carbon budget could be attributed to bacterivory at low temperatures. Grazing experiments in nutrient‐modified media revealed that this mixotroph had increased ingestion rates when either dissolved nitrogen or phosphorus was decreased. This work increases our understanding of environmental effects on mixotrophic nutrition. Although the influence of abiotic factors on phagotrophy and phototrophy in pure heterotrophs and phototrophs has been well studied, much less is known for mixotrophic organisms.
影响因子：
2.2
作者：
Johnson, Matthew D.
通讯作者：
Johnson, Matthew D.
DOI：
10.1073/pnas.1118179109
发表时间：
2012-04-10
影响因子：
11.1
作者：
Hartmann, Manuela;Grob, Carolina;Zubkov, Mikhail V.
通讯作者：
Zubkov, Mikhail V.