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首页> 外文期刊>Marine biology >Variation in biochemical composition during encystment of the planktonic dinoflagellate Akashiwo sanguined in N-limited cultures
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Variation in biochemical composition during encystment of the planktonic dinoflagellate Akashiwo sanguined in N-limited cultures

机译：N限制培养中血红蛋白鞭毛藻赤潮包裹时生化组成的变化

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The planktonic dinoflagellate Akashiwo sanguinea is a commonly observed bloom-forming species in estuarine and coastal waters worldwide. Large scales of A. sanguinea bloom cause the mass mortality of fish, shellfish, and sea birds. The formation of resting cysts plays as a potential vector for its wide distribution and frequent recurrence of blooms; however, the biochemical characteristics of algal cells during their life cycle remain unclear. For the first time, the variations in cellular chlorophyll a (Chl a), protein, carbohydrate, and total lipid contents during encystment of A. sanguinea cultured in different nitrate concentrations, namely 0-, 25-, 50-, 100-, 200-, and 833-mu M N-added treatment, were studied in the present study. The results indicated that resting cysts were formed in all the N treatments, with the highest encystment ratio of 3.34 +/- 0.57% observed in the 100-mu M N-added treatment, and the lowest rate of 0.80 +/- 0.03% observed in the 883-mu M N-added treatment. The levels of the four biochemical components varied significantly during the encystment process. The Chl a and protein levels were significantly lower in newly formed cysts than in vegetative cells; however, continuous accumulation of carbohydrates and total lipids occurred with the algal growth, particularly of carbohydrates in the resting cysts, which was more than tenfold greater than those in the vegetative cells. Low initial N concentrations were more favorable for carbohydrate accumulation in cysts than high N concentrations. The accumulated components may play vital roles for the substance of A. sanguinea during resting stage. The results provided fundamental information for an improved understanding of the physiological response of A. sanguinea during encystment.
机译：浮游的鞭毛藻赤潮（Akashiwo sanguinea）是世界范围内河口和沿海水域中普遍观察到的水华形成物种。大规模的A.sanguinea绽放导致鱼类，贝类和海鸟大量死亡。静止的囊肿的形成是其广泛分布和频繁开花的潜在载体。然而，藻类细胞在其生命周期中的生化特性仍不清楚。首次在不同硝酸盐浓度（即0-，25-，50-，100-200）下培养的金黄色葡萄球菌包囊过程中，细胞叶绿素a（Chl a），蛋白质，碳水化合物和总脂质含量的变化-和833-mu M N加法，在本研究中进行了研究。结果表明，在所有的N处理中均形成了静止的囊肿，在添加100μMN的处理中，包囊率最高，为3.34 +/- 0.57％，最低的率为0.80 +/- 0.03％在添加了883亩M N的土壤中。包囊过程中四种生化成分的水平差异很大。新形成的囊肿中的Chla和蛋白质水平显着低于营养细胞。然而，随着藻类的生长，碳水化合物和总脂质的持续积累发生了，特别是静息囊肿中的碳水化合物，这比营养细胞中的碳水化合物大十倍以上。低的初始N浓度比高的N浓度更有利于囊肿中的碳水化合物积累。在休息阶段，积累的成分可能对血红曲霉的物质起着至关重要的作用。该结果提供了基础信息，可用于更好地理解包囊过程中血红曲霉的生理反应。

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  • 来源
    《Marine biology》 |2019年第9期|120.1-120.12|共12页
  • 作者

    Liu Yun; Chen Tiantian; Song Shuqun; Li Caiwen;

  • 作者单位

    Chinese Acad Sci Inst Oceanol CAS Key Lab Marine Ecol & Environm Sci Qingdao 266071 Shandong Peoples R China|Pilot Natl Lab Marine Sci & Technol Qingdao Lab Marine Ecol & Environm Sci Qingdao 266237 Shandong Peoples R China|Chinese Acad Sci Ctr Ocean Mega Sci Qingdao 266071 Shandong Peoples R China;

    Chinese Acad Sci Inst Oceanol CAS Key Lab Marine Ecol & Environm Sci Qingdao 266071 Shandong Peoples R China|Pilot Natl Lab Marine Sci & Technol Qingdao Lab Marine Ecol & Environm Sci Qingdao 266237 Shandong Peoples R China|Chinese Acad Sci Ctr Ocean Mega Sci Qingdao 266071 Shandong Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

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