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首页> 外文期刊>Marine biology >Responses of photosynthesis and nitrogen assimilation in the green-tide macroalga Ulva prolifera to desiccation
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Responses of photosynthesis and nitrogen assimilation in the green-tide macroalga Ulva prolifera to desiccation

机译：绿潮大藻Ulva增殖中光合作用和氮同化对干燥的响应

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摘要

The Yellow Sea in China has experienced annual large-scale green tides since 2007. Ulva prolifera, the dominant causative species, originating from Pyropia yezoensis aquaculture rafts, experiences periodic tidal emersion in the intertidal nursery. It was proposed that physiological adaptations of U. prolifera may enable it to survive the harsh intertidal environment and contribute to subsequent blooms. In this paper, we measured the responses of photosynthesis and nitrogen assimilation of U. prolifera during desiccation of 0-6 h and subsequent rehydration for 0-24 h. The results suggested that both PSII photosynthesis and nitrogen assimilation were significantly reduced at the onset of desiccation. These reductions were reflected by decreases in the maximum quantum yield (F-v/F-m), effective photochemical quantum yield (YII), maximal electron transport rate (ETRmax), light utilization efficiency (alpha), NO3-N and NH4-N uptake rates, tissue nitrogen concentration (TN), and nitrate reductase activity (NRA). Desiccation temporarily lowered PSII photosynthesis, but rates recovered after algae were submerged for 24 h. Assimilation of nitrogen was also reduced during exposure to air. Although both NO3-N and NH4-N uptake rate recovered within 12 h upon rehydration, TN and NRA were not completed within 24 h. U. prolifera therefore appears well adapted to survive prolonged periods of desiccation, as it experiences growing in Pyropia farms along the Chinese Jiangsu coast. These traits, along with its ability to grow fast, may explain its success and one of the mechanisms behind the formation of the extreme blooms in the Yellow Sea.
机译：自2007年以来，中国的黄海每年都经历过大规模的绿色潮汐。Ulvaprolifera是占主导地位的致病物种，起源于yezoensis的水产养殖筏，在潮间苗圃中周期性地出现潮汐。有人提出，U。prolifera的生理适应性使其能够在恶劣的潮间环境中生存并有助于随后的开花。在本文中，我们测量了0-6小时的干燥和0-24小时的再水化过程中，U。prolifera的光合作用和氮同化的响应。结果表明在干燥开始时，PSII的光合作用和氮同化作用均显着降低。这些减少反映为最大量子产率（Fv / Fm），有效光化学量子产率（YII），最大电子传输速率（ETRmax），光利用效率（α），NO3-N和NH4-N吸收速率的降低，组织氮浓度（TN）和硝酸盐还原酶活性（NRA）。干燥暂时降低了PSII的光合作用，但藻类浸没24小时后恢复了速率。暴露于空气中氮的吸收也减少了。尽管在补液后12小时内，NO3-N和NH4-N的吸收速率均恢复了，但TN和NRA在24小时内仍未完成。因此，U。prolifera看起来很适合长期干燥，因为它在中国江苏沿海的远视养殖场中生长。这些特征以及其快速生长的能力，可以解释其成功以及黄海极端水华形成的机制之一。

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  • 来源
    《Marine biology》 |2016年第1期|9.1-9.8|共8页
  • 作者

    Xu Dong; Zhang Xiaowen; Wang Yitao; Fan Xiao; Miao Yu; Ye Naihao; Zhuang Zhimeng;

  • 作者单位

    Ocean Univ China, Coll Fisheries, Qingdao, Peoples R China|Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao, Peoples R China;

    Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao, Peoples R China;

    Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao, Peoples R China;

    Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao, Peoples R China;

    Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao, Peoples R China;

    Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao, Peoples R China|Qingdao Natl Lab Marine Sci & Technol, Funct Lab Marine Fisheries Sci & Food Prod Proc, Qingdao, Peoples R China;

    Chinese Acad Fishery Sci, Yellow Sea Fisheries Res Inst, Qingdao, Peoples R China;

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