Significance of HCO3- alkalinity in calcification and utilization of dissolved inorganic carbon in Chara vulgaris

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2017-11-02 DOI:10.3354/AB00684

Heyun Wang, L. Ni, Dan Yu

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引用次数: 2

Abstract

To investigate the influence of HCO3 alkalinity on calcification in thalli of the genus Chara, we studied the effects of increased light level and additional HCO3 on calcification rate in C. vulgaris at various hours (30 min, 8 h, 12 h, 12.5 h, 20 h and 24 h after treatment) in a 24 h experiment (12 h light:12 h dark). We identified a significant Pearson’s correlation between exogenous dissolved inorganic carbon (DIC) concentrations and the utilization of DIC (μmol C g−1 fresh weight). Plotting the daily rhythm of DIC utilization produced negative quadratic curves. Furthermore, calcification rate (μmol Ca h−1 g−1) was linearly related to DIC utilization rate (DICuptake; μmol C h−1 g −1), indicating that the calcification rate is dependent on DICuptake. However, ratios of calcification to the utilization of DIC were decreased at high light intensity and increased with HCO3 addition, which was mainly ascribed to changes in the ratio of calcification to photosynthesis. Chlorophyll fluorescence results provided direct evidence for the promotion of photosynthesis in Chara thalli by both high light and DIC addition and their positive influence on maximum relative electron transport rate. These results suggest that calcification in calcareous C. vulgaris is mainly restrained by HCO3 alkalinity, which could explain the correlation between calcification of Chara thalli and alkalinity of water bodies in the field.

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HCO3-碱度在Chara vulgaris钙化及溶解无机碳利用中的意义

为了研究HCO3碱度对Chara属菌体钙化的影响，我们在24 h(光照12 h:黑暗12 h)试验中，研究了不同时间(处理后30 min、8 h、12 h、12.5 h、20 h和24 h)增加光照水平和添加HCO3对C. vulgaris钙化率的影响。我们发现外源溶解无机碳(DIC)浓度与DIC (μmol C g−1鲜重)的利用率之间存在显著的Pearson相关。绘制DIC利用的每日节律产生负二次曲线。钙化率(μmol Ca h−1 g−1)与DIC利用率(DICuptake;μmol C h−1 g−1)，表明钙化速率依赖于dici的摄取。然而，在强光下，钙化与DIC利用率之比降低，随着HCO3的加入而增加，这主要归因于钙化与光合作用之比的变化。叶绿素荧光结果为强光和DIC添加对查拉菌体光合作用的促进及其对最大相对电子传递速率的积极影响提供了直接证据。这些结果表明，钙质C. vulgaris的钙化主要受到HCO3碱度的抑制，这可以解释田间菌体钙化与水体碱度的相关性。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.

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