The combined effects of PAR and temperature including the chilling-light stress on the photosynthesis of a temperate brown alga, Sargassum patens (Fucales), based on field and laboratory measurements
The combined effects of PAR and temperature including the chilling-light stress on the photosynthesis of a temperate brown alga, Sargassum patens (Fucales), based on field and laboratory measurements
复制标题
基于现场和实验室测量的 PAR 和温度（包括冷光胁迫）对温带褐藻马尾藻 (Fucales) 光合作用的综合影响
DOI：
10.1007/s10811-017-1344-7
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发表时间：
2018
影响因子：
3.3
通讯作者：
S.
中科院分区：
文献类型：
--
作者：
Terada;R.;Matsumoto;K.;Borlongan;I. A.;Watanabe;Y.;Nishihara;G. N.;Endo;H.;Shimada;S.
通过野外和室内测定，研究了光合有效辐射（PAR）和温度对日本温带棕色海藻展叶马尾藻（Fucales）光合作用的综合影响。在日本鹿儿岛对该藻自然种群的水下测量表明，有效量子产额（ΦPSII）随入射PAR的增加而下降，ΦPSII最低值出现在中午至下午早些时候，Φ PSII在傍晚恢复，表明动态光抑制。在实验室实验中，Φ PSII也与PAR呈负相关，在8、20和28 °C下连续暴露于200（低）和1000（高）μmol光子m−2s− 1 12 h后，PAR下降。在8 °C和低PAR下的最大量子产率（Fv/Fm）在黑暗驯化12 h后未能恢复，表明低温在慢性光抑制中的影响。光合-辐照（P-E）曲线同样显示8 °C下较低的净光合速率和光抑制。在一定温度范围内（8-40 °C）测定的总光合作用和暗呼吸实验表明，最大总光合速率（GPmax）发生在26.9 °C。温度暴露72小时后，Fv/Fmaf在8-32 °C下稳定;但在36和40 °C下失活。本种非常适应日本温带地区的当前温度范围（7-28 °C）。然而，低温和PAR的综合效应可能会影响藻类的光合效率，因此可能是限制在边缘地区的北方分布的这种温带物种。
The combined effects of photosynthetically active radiation (PAR) and temperature on the photosynthesis of a temperate Japanese brown alga,Sargassum patens(Fucales), were determined by field and laboratory measurements. Underwater measurements of the natural population of this alga in Kagoshima, Japan, revealed that the effective quantum yield (ΦPSII) declined with increasing incident PAR, with minimumΦPSIIoccurring during noon to early afternoon.ΦPSIIrecovered in the evening, indicating dynamic photoinhibition. In laboratory experiments,ΦPSIIwas also negatively correlated with PAR, which decreased after 12 h of continuous exposure to 200 (low) and 1000 (high) μmol photons m−2s−1at 8, 20, and 28 °C. Maximum quantum yield (Fv/Fm) at 8 °C with low PAR failed to recover after 12 h of dark acclimation, suggesting the influence of low temperature in chronic photoinhibition. Photosynthesis–irradiance (P–E) curves likewise revealed lower net photosynthetic rates and photoinhibition at 8 °C. Gross photosynthesis and dark respiration experiments determined over a range of temperatures (8–40 °C) revealed that the maximum gross photosynthetic rate (GPmax) occurred at 26.9 °C.Fv/Fmafter 72 h of temperature exposures was stable at 8–32 °C; but it was deactivated at 36 and 40 °C. This species is well-adapted to the current range of temperature in the temperate region of Japan (7–28 °C). However, the combined effects of low temperature and PAR may influence algal photosynthetic efficiency and so may be limiting at the marginal region of northern distribution of this temperate species.