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首页> 外文期刊>Marine biology >Daily and seasonal variations of optimum quantum yield and phenolic compounds in Cystoseira tamariscifolia (Phaeophyta)
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Daily and seasonal variations of optimum quantum yield and phenolic compounds in Cystoseira tamariscifolia (Phaeophyta)

机译：番茄（Cystoseira tamariscifolia）（Phaeophyta）的最佳量子产率和酚类化合物的每日和季节性变化

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摘要

Effects of solar radiation on phenolic compound concentrations and photosynthetic activity, estimated as in vivo chlorophyll fluorescence, in the brown alga Cystoseira tamariscifolia (Hudson) Papenfuss were analyzed in southern Spain from June 1988 to July 2000. Annual and diurnal variations of optimum quantum yield were negatively correlated with incident irradiance. Optimum quantum yield decreased as irradiance increased at noon, and yield values recovered in the afternoon suggesting a dynamic photoinhibition. The annual and daily fluctuations of phenolic compound concentration in the tissue of C. tamariscifolia showed contrasting patterns. There was an annual cycle of phenolic compound concentration in the apical thallus, which was positively correlated with incident irradiance. The increase in phenolic compounds, however, was twofold greater in the first half of the year than the decrease during the second half of the year. In contrast to the annual cycle, there appeared to be a negative correlation between phenolic compound concentration and irradiance in the summer months while no specific relationship was observed in the fall-winter months. Loss of phenolic compounds from the tissue to the surrounding water was increased as irradiation dosage increased. This suggests that the decrease of phenolic compounds during the diurnal cycle might be regulated by the exudation of these compounds at high irradiances in the field. Collectively, our results suggest that, like dynamic photoinhibition, the rapid synthesis and turnover time of phenolic compounds in the tissue of C. tamariscifolia might serve as photoprotective mechanisms against high irradiances.
机译：1988年6月至2000年7月在西班牙南部分析了褐藻Cystoseira tamariscifolia（Hudson）Papenfuss中太阳辐射对酚类化合物浓度和光合活性（据体内叶绿素荧光估计）的影响。最佳量子产率的年度和日变化为与入射辐照度负相关。最佳量子产率随着中午辐照度的增加而降低，并且在下午恢复了产率值，表明存在动态光抑制作用。柳叶卷柏组织中酚类化合物浓度的年和日波动呈现出相反的模式。顶端th体中酚类化合物的浓度存在一个年度循环，与入射辐照度呈正相关。但是，酚类化合物的增加在上半年是下半年的减少两倍。与年度周期相反，夏季月份中酚类化合物的浓度与辐照度之间存在负相关关系，而在秋冬季月份中则没有特别的关系。随着辐照剂量的增加，酚类化合物从组织到周围水体的损失增加。这表明在田间日照周期中酚类化合物的减少可能受到这些化合物在高辐照度下渗出的调节。总的来说，我们的结果表明，像动态光抑制一样，柳叶卷柏组织中酚类化合物的快速合成和转换时间可能是针对高辐照度的光保护机制。

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