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首页> 外文期刊>Harmful Algae >Interaction of nitrogen source and light intensity on the growth and photosynthesis of the brown tide alga Aureococcus anophagefferens
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Interaction of nitrogen source and light intensity on the growth and photosynthesis of the brown tide alga Aureococcus anophagefferens

机译：氮源与光强的相互作用对褐藻藻嗜藻金黄色葡萄球菌生长和光合作用的影响

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High ratios of dissolved organic nitrogen (DON) to dissolved inorganic nitrogen (DIN) have been suggested to favor the growth of the brown tide alga Aureococcus anophagefferens. DON could provide a particular advantage in low light levels, as occur when blooms induce self-shading. We examined the effects of varying DON:DIN ratios on the photosynthetic abilities of cultured Aureococcus at two light intensities, 93 and 17 μmol photons m~(-2) s~(-1). Glutamic acid and urea were used as DON sources, and the remainder of the nitrogen was added as nitrate. In experiments examining Aureococcus growth with varying ratios of DON_(Glu):DIN_(Nitrate) at two light intensities in batch culture, higher growth rates and biomass were observed in treatments containing DIN than in those with DON only, which contrasts with the results of previous studies. In semi-continuous growth experiments with varying DON_(Urea):DIN_(Nitrate) ratios, low light cultures with urea had higher growth rates than those without urea. Also, the effective target area for light absorption per cell and photosystem Ⅱ efficiency were greater for the low light cultures of each nutrient treatment, particularly when DON:DIN mixtures (33 and 67% N_(Urea)) were used. The same pattern was seen in the maximum photosynthetic rates per cell in the light-saturated (P_m~(cell)) and in the initial slope (α~(cell)) of the PE (photosynthesis versus irradiance) curve, and in PON, POC and chlorophyll a cell~(-1). This indicates that the ability of Aureococcus to acclimate to low light conditions may be enhanced by the presence of both organic and inorganic nitrogen sources. These results suggest that Aureococcus physiology and photosynthesis are different during growth on a mixture of urea-N and nitrate than when either nitrogen source is present alone. Results of this study suggest that Aureococcus may not respond to all DON substrates in the same way, and that mixtures of DON and DIN may provide for higher photosynthetic rates, especially at low light. Our results did not, however, support earlier suggestions that growth on DON alone provides the brown tide alga with a large advantage at low light levels.
机译：已提出高比例的溶解性有机氮（DON）与溶解性无机氮（DIN），有利于褐藻藻嗜藻金黄色葡萄球菌的生长。 DON可以在低光照条件下提供特殊的优势，例如在花朵引发自遮蔽时会发生这种情况。我们研究了不同的DON：DIN比对两种光强度下的培养金黄色葡萄球菌光合能力的影响，光强度分别为93和17μmol光子m〜（-2）s〜（-1）。谷氨酸和尿素用作DON源，其余的氮作为硝酸盐加入。在分批培养中以两种光强度检查DON_（Glu）：DIN_（硝酸盐）比率不同的金黄色葡萄球菌生长的实验中，与仅使用DON的处理相比，含DIN的处理观察到更高的生长速率和生物量，这与之前的学习。在具有不同DON_（尿素）：DIN_（硝酸盐）比率的半连续生长实验中，含尿素的弱光培养物的生长速率高于不含尿素的低培养物。同样，在每种营养处理的弱光条件下，每个细胞的光吸收有效目标面积和光系统Ⅱ效率更高，尤其是当使用DON：DIN混合物（33％和67％N_（尿素））时。在PE的光饱和（P_m〜（cell））和PE的初始斜率（α〜（cell））曲线中以及在PON中，每个细胞的最大光合速率观察到相同的模式POC和叶绿素a细胞〜（-1）。这表明，通过同时存在有机和无机氮源，可以提高金黄色葡萄球菌适应弱光条件的能力。这些结果表明，与单独存在任何一种氮源时相比，在尿素-N和硝酸盐混合物上生长期间，金黄色葡萄球菌的生理和光合作用不同。这项研究的结果表明，金黄色葡萄球菌可能不会以相同的方式对所有DON底物产生反应，并且DON和DIN的混合物可能提供更高的光合速率，尤其是在弱光下。但是，我们的结果并没有支持早期的建议，即仅在DON上生长，在低光照条件下，褐藻具有很大的优势。

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