Abstract Previously, we reported seasonal variation in iodine contents in the seagrass Zostera marina. Herein, we sought the factors controlling this variation, and investigated relationships between iodine and carbohydrate contents, using extracts and residues of seagrass samples extracted with 0.1 N HCl. In plants, carbohydrates in HCl-extracted and residual fractions are considered to represent storage and structural carbohydrates, respectively. On average, 44% and 56% of total iodine in samples was contained in the HCl-extracted and residual fractions, respectively. Both HCl-extracted and residual iodine contents showed seasonal trends similar to that of total iodine, being high in winter–spring and low in summer. Total and HCl-extracted carbohydrate contents showed reverse seasonal trends from those of iodine, whereas residual carbohydrate contents had comparable values throughout the sampling period. In the total and HCl-extracted fractions, negative correlations between iodine and carbohydrate contents were confirmed, suggesting that carbohydrates do not play important roles in iodine accumulation. Although most monosaccharide contents were not correlated with iodine contents in these two fractions, residual galactose content was positively correlated with residual iodine. We accordingly suggest that one or more specific structural carbohydrate constituents may potentially function as an iodine store in Z. marina.

中文翻译：

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日本中部西北太平洋沿岸海草带状藻码头碘与碳水化合物含量的关系

摘要 此前，我们报道了海草带状疱疹码头碘含量的季节性变化。在此，我们寻找控制这种变化的因素，并使用用 0.1 N HCl 提取的海草样品的提取物和残留物研究了碘和碳水化合物含量之间的关系。在植物中，HCl 提取和残留部分中的碳水化合物被认为分别代表储存和结构碳水化合物。平均而言，样品中总碘的 44% 和 56% 分别包含在 HCl 提取和残留部分中。HCl 提取的和残留的碘含量都显示出与总碘相似的季节性趋势，冬春季高，夏季低。总碳水化合物和 HCl 提取的碳水化合物含量与碘的季节性趋势相反，而残留碳水化合物含量在整个采样期间具有可比值。在总馏分和 HCl 提取馏分中，碘和碳水化合物含量之间的负相关得到证实，表明碳水化合物在碘积累中没有发挥重要作用。尽管在这两个部分中，大多数单糖含量与碘含量无关，但残留半乳糖含量与残留碘呈正相关。因此，我们建议一种或多种特定的结构碳水化合物成分可能在 Z. marina 中起到碘储存的作用。表明碳水化合物在碘积累中没有发挥重要作用。尽管在这两个部分中，大多数单糖含量与碘含量无关，但残留半乳糖含量与残留碘呈正相关。因此，我们建议一种或多种特定的结构碳水化合物成分可能在 Z. marina 中起到碘储存的作用。表明碳水化合物在碘积累中没有发挥重要作用。尽管在这两个部分中，大多数单糖含量与碘含量无关，但残留半乳糖含量与残留碘呈正相关。因此，我们建议一种或多种特定的结构碳水化合物成分可能在 Z. marina 中起到碘储存的作用。