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首页> 外文期刊>Phycological Research >Photosynthetic activity in two heteromorphic life-history stages of a freshwater red alga, Thorea gaudichaudii (Thoreales) from Japan, in response to an irradiance and temperature gradient
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Photosynthetic activity in two heteromorphic life-history stages of a freshwater red alga, Thorea gaudichaudii (Thoreales) from Japan, in response to an irradiance and temperature gradient

机译：来自日本淡水红藻（Thoreales）的淡水红藻（Thoreales）的两种异常寿命阶段的光合活动，以应对辐照度和温度梯度

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摘要

We determined the effect of irradiance and temperature on the photosynthesis of two heteromorphic life-history stages of an endangered freshwater red alga, Thorea gaudichaudii (Thoreales) by laboratory and field measurements. Net oxygenic photosynthesis-irradiance models of macroscopic and microscopic life-history stages revealed similar low irradiance-adapted responses, with a compensation irradiance (E-c) of 6.71 and 2.56 mu mol photons m(-2) s(-1) (4.30-9.13 and 0.13-7.19, 95% Bayesian prediction interval, BPI) and saturating irradiance (E-k) of 26.6 and 30.0 mu mol photons m(-2) s(-1) (19.0-37.4 and 12.1-63.0, BPI), respectively. A temperature-dependent model of net photosynthesis and dark respiration in macroscopic and microscopic stages also showed similar temperature responses, and the gross photosynthetic rate (GP(max)), 3.54 and 6.34 mu g O-2 g(ww)(-1) min(-1) (3.10-3.99 and 5.31-8.21, BPI), was highest at 32.1 and 35.7 degrees C (29.8-34.0 and 29.5-48.6, BPI). The maximum quantum yields (F-v/F-m) in macroscopic and microscopic stages were also similar in response with respect to temperature; however, it was somewhat steady at low temperatures with the highest value of 0.54 and 0.62 (0.54-0.55 and 0.61-0.63, BPI) at 17.8 and 15.0 degrees C (16.7-18.8 and 12.3-17.1, BPI). The effective quantum yield (phi(PSII)) in macroscopic and microscopic stages was also negatively correlated with irradiance, which decreased after 12 h of continuous exposure to 50 (low) and 1000 (high) mu mol photons m(-2) s(-1) at 12 and 22 degrees C. Large declines of phi(PSII) and subsequent failure of F-v/F-m recovery were particularly enhanced at high irradiance, signifying photoinhibition. Diurnal change of phi(PSII) and incident irradiance of the macroscopic stage under the field measurement revealed the midday depression of phi(PSII); however, there was little direct sunlight due to shading by the trees, and algae were occurring in the shaded locations in the freshwater spring.
机译：通过实验室和现场测量，我们确定了辐照度和温度对濒危淡水红藻（Thoreales）的两种异常寿命阶段的光合作用的影响。诸如宏观和微观寿命阶段的净氧化光合作用 - 辐照模型揭示了类似的低辐照度适应的反应，其补偿辐照度（EC）为6.71和2.56μmol光子M（-2）S（-1）（4.30-9.13 0.13-7.19,95％的贝叶斯预测间隔，BPI）和饱和辐照度（EK）分别为26.6和30.0μmMol光子M（-2）（-1）（19.0-37.4和12.1-63.0，BPI）。宏观和微观阶段的净光合作用和暗呼吸的温度依赖性模型也表现出类似的温度响应，以及毛的光合速率（GP（MAX）），3.54和6.34μg（WW）（ - 1） MIN（-1）（3.10-3.99和5.31-8.21，BPI），最高32.1和35.7摄氏度（29.8-34.0和29.5-48.6，BPI）。宏观和微观阶段中的最大量子产率（F-V / F-M）在相对于温度的响应中也类似;然而，在17.8和15.0摄氏度（16.7-18.8和12.3-17.1，BPI）的低温下，在低温下略微稳定为0.54和0.62（0.54-0.55和0.61-0.63，BPI）。宏观和微观阶段中的有效量子产率（PHI（PSII））也与辐照度呈负相关，其在连续暴露于50（低）和1000（高）mmol光子M（-2）S（ -1）在12和22摄氏度下，PHI（PSII）的大幅下降和随后的FV / FM恢复失效在高辐照度下特别提高，意味着光燃烧。在现场测量下宏观阶段的PHI（PSII）和入射辐照度的昼夜变化显示了PHI（PSII）的午间抑制;然而，由于树木的阴影，几乎没有直射阳光，并且在淡水弹簧的阴影位置发生藻类。

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