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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Stress metabolite pattern in the eulittoral red alga Pyropiaplicata (Bangiales) in New Zealand - mycosporine-like amino acids and heterosides
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Stress metabolite pattern in the eulittoral red alga Pyropiaplicata (Bangiales) in New Zealand - mycosporine-like amino acids and heterosides

机译：新西兰eulittoral红藻Pyropiaplicata（Bangiales）的应力代谢产物模式-类霉菌素氨基酸和杂种

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摘要

Intertidal rocky shore ecosystems are affected by steep environmental gradients such as fluctuating solar irradiation and salinity along the marine-terrestrial interface. The eulittoral red alga Pyropia plicata (Bangiales) is endemic and abundant to coastal regions of New Zealand and almost unstudied in terms of ecophysiological performance under radiation and salinity stress. Therefore, the acclimation potential of this species against enhanced ultraviolet radiation (UVR) and osmotic stress was evaluated in a combination of field and laboratory experiments with an emphasis on stress metabolite concentrations (UV-sunscreens, organic osmolytes). Samples of P. plicate were collected at the same site in the intertidal zone of Wellington, New Zealand over three seasons (April-November 2016) and used in independent UV and salt stress experiments under controlled conditions. The mycosporine-like amino acids (MAA) shinorine and porphyra-334 were the quantitatively dominant UV sunscreen compounds, and the total concentrations varied over the year between 5 and 14 mg g(-1) dry weight (DW), but neither UVR nor PAR had a significant impact on the total or individual MAA concentrations. A UV radiation stress experiment was conducted, but the total MAA concentrations of 6-8 mg g(-1) DW did not change, neither did the contents of shinorine (similar to 3 mg g(-1) DW) nor that of porphyra-334 (4-5 mg g(-1) DW). This suggests, that P. plicata has sufficiently high UV-sunscreen amounts and hence does not respond to changes in UV radiation. Pyropia plicate contained three heterosides (floridoside, D- and L-isofloridoside), which act as organic osmolytes. Seasonally the total concentrations of these compounds varied between 203 and 1226 mmol kg(-1) DW, with L-isofloridoside quantitatively dominating all samples. A salt stress experiment showed an increase in the total heteroside concentrations in P. plicate with increasing salinities. However, floridoside was the most up regulated heteroside under hypersaline conditions indicating its key role in osmotic acclimation. Our data indicate that P. plicate always contains various stress metabolites in consistently high concentrations which mitigate against environmental changes typical of the intertidal zone of New Zealand.
机译：潮间带多岩石的海岸生态系统受到陡峭的环境梯度的影响，例如沿海陆界面的太阳辐射和盐度的波动。 Eulittoral红藻Pyropia plicata（Bangiales）是地方性的，在新西兰沿海地区盛产，在辐射和盐分胁迫下，其生态生理性能几乎未被研究。因此，在野外和实验室实验相结合的评估中，该物种针对增强的紫外线辐射（UVR）和渗透压的适应潜力进行了评估，重点是应力代谢物的浓度（紫外线防晒剂，有机渗透物）。在三个季节（2016年4月至11月）在新西兰惠灵顿潮间带的同一地点采集了倍数假单胞菌样品，并在受控条件下用于独立的紫外线和盐胁迫实验。霉菌素样氨基酸（MAA）的shinorine和porphyra-334是数量占主导地位的紫外线防晒化合物，其全年总浓度在5至14 mg g（-1）干重（DW）之间变化，但UVR和PAR对总或单个MAA浓度有重大影响。进行了紫外线辐射胁迫实验，但总的MAA浓度为6-8 mg g（-1）DW，丝光碱的含量（类似于3 mg g（-1）DW）和紫菜的含量均未改变-334（4-5 mg g（-1）DW）。这表明，P。plicata具有足够高的紫外线防晒剂含量，因此不响应紫外线辐射的变化。倍数近视眼含有三种杂有机物（floridoside，D-和L-isofloridoside），作为有机渗透压。季节性地，这些化合物的总浓度在203至1226 mmol kg（-1）DW之间变化，其中L-异花苷苷定量地控制了所有样品。盐胁迫实验表明，随着盐度的增加，褶皱假单胞菌中总异氰酸酯浓度增加。然而，在高盐条件下，floridoside是上调程度最高的异氰酸酯，表明其在渗透适应中的关键作用。我们的数据表明，褶皱假单胞菌始终以高浓度持续包含各种胁迫代谢物，从而减轻了新西兰潮间带典型的环境变化。

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