The occurrence of Phycocalidia tanegashimensis (Bangiaceae) in the splash zone may be related to the tolerance of photochemical efficiency to temperature, irradiance, desiccation, and salinity
The occurrence of Phycocalidia tanegashimensis (Bangiaceae) in the splash zone may be related to the tolerance of photochemical efficiency to temperature, irradiance, desiccation, and salinity
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DOI：
10.1007/s10811-021-02498-w
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发表时间：
2021-05
影响因子：
3.3
通讯作者：
Gangping Xu;Ryuta Terada;Yuki Watanabe;Gregory N. Nishihara
中科院分区：
文献类型：
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作者：
Gangping Xu;Ryuta Terada;Yuki Watanabe;Gregory N. Nishihara
研究了温度和光照的联合作用以及干燥和盐度对日本谷儿岛岛亚热带红藻藻类光化学效率的影响，以揭示该物种如何适应飞溅区的栖息地。在12℃、20℃和28℃下，光系统II(−2s−1)的有效量子产率(ΔF/Fm‘)在12℃、20℃和28℃下连续暴露6小时后，光系统II的最大量子产率(Fv/Fm)几乎恢复到20℃和28℃时的初始值，显示出其高恢复能力。相反，在12℃的低照度和高照度下，即使在14小时的暗光驯化后，也没有恢复到初始值，这表明低温照度下的抑制作用增强。在24℃、50%湿度下连续干燥(~ 480min)的响应表明，ΔF/Fm‘随绝对含水率的降低而减小。然而，对于AWC10%以上的样品，ΔF/Fm‘在随后的海水中复水1d后基本恢复到初始水平，表明其对脱水的耐受性较强。在3天的暴露下，这种藻类还能耐受大范围的盐度(即10-60PSU)。《OFP》的改编。相对较高的光照、温暖的温度和较强的渗透(干燥和盐度)耐受性可能是其在日本亚热带环境中飞溅带繁衍的高能力的原因。
The combined effects of temperature and irradiance and the influences of desiccation and salinity on the photochemical efficiency in a subtropical red alga,Phycocalidia tanegashimensis(=Pyropia tanegashimensis, Bangiaceae) from Tanegashima Island, Japan, were determined to reveal how this species has adapted to its habitat in the splash zone. Continuous 6-h exposure to irradiance of 200 (low) and 1000 (high) µmol photons m−2s−1at 12, 20, and 28 °C showed a decline in the effective quantum yields (ΔF/Fm′) of photosystem II (PSII) during the exposures; nevertheless, the maximum quantum yields (Fv/Fm) of PSII measured in subsequent 14-h dim-light acclimation almost returned to initial values at 20 and 28 °C, revealing its high capacity to recovery. In contrast, those under both low and high irradiances at 12 °C did not recover to initial values even after 14-h dim-light acclimation, signifying enhanced inhibition under irradiance at low temperature. The response to continuous desiccation (~ 480 min) under 50% humidity at 24 °C showed that theΔF/Fm′decreased with decreasing absolute water content (AWC). However, for the samples with an AWC above 10%,ΔF/Fm′mostly recovered to initial levels after subsequent 1-day rehydration in seawater, suggesting relatively strong tolerance to desiccation. This alga also tolerated a broad range of salinity (i.e., 10–60 psu) under 3-day exposures. The adaptations ofP. tanegashimensisto relatively high irradiance, warm temperature, and a strong osmotic (desiccation and salinity) tolerance may explain its high capacity to flourish in the splash zone in the subtropical environment of Japan.