MICRONUTRIENT UPTAKE AND TRANSLOCATION BY MACROCYSTIS-PYRIFERA (PHAEOPHYTA)
MICRONUTRIENT UPTAKE AND TRANSLOCATION BY MACROCYSTIS-PYRIFERA (PHAEOPHYTA)
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DOI：
10.1111/j.0022-3646.1984.00192.x
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发表时间：
1984-01-01
影响因子：
2.9
通讯作者：
MANLEY, SL
中科院分区：
文献类型：
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作者：
MANLEY, SL
M. pyrifera （L.）微量元素（Mn、Co、Cu、Zn、Mo和I）的放射性核素c Ag)。在人工海水中采用适当的放射性核素测定叶片成熟组织的微量营养素吸收率。通过使用合适的洗涤溶液，将细胞摄取与自由空间摄取区分开来。然后将吸收速率转换到海洋环境中，并做出了几个假设。测定了去除细胞外微量元素处理前后叶片成熟组织的微量元素含量。对叶片生长的数学描述是从先前发表的数据中发展出来的，并用于推导与微量营养素同化（组织结合）和叶片吸收有关的方程，两者都用mg .cntdot表示。第一天，到前台长度。计算表明，在一定的叶长（xi）下，同化等于Mn、Co和Fe的吸收。长度大于xi的叶片吸收大于同化，长度小于xi的叶片吸收小于同化。Mn和Co在xi处的大同化值进一步表明，这些元素有时可能限制大囊藻的生长。计算还表明，铜、锌、钼、镍和镍的吸收大于同化，这表明这些元素被运输到其他组织中储存（例如，在holdfast中）或释放（例如，从叶尖）。
Radionuclides of the micronutrients (Mn, Co, Cu, Zn, Mo and I) of M. pyrifera (L.) C. Ag. and the nonnutrient Ni were concentrated in sieve tube sap. Micronutrient uptake rates of mature blade tissue were determined using the appropriate radionuclide in artificial seawater. Cellular uptake was distinguished from free space uptake by the use of suitable wash solutions. The uptake rates were then transposed to conditions in the sea, with several assumptions being made. Micronutrient content was determined for mature blade tissue before and after treatment to remove extracellular micronutrients. A mathematical description of frond growth was developed from previously published data and used to derive equations relating micronutrient assimilation (tissue incorporation) and uptake by fronds, both expressed in mg .cntdot. day-1, to frond length. Calculations revealed that at a certain frond length (xi) assimilation equaled uptake for Mn, Co and Fe. Uptake was greater than assimilation for fronds longer than xi and less than assimilation for fonds shorter than xi. The large assimilation values at xi for Mn and Co further indicate that these elements, at times, may limit Macrocystis growth. Calculations also showed that Cu, Zn, Mo, I and Ni uptake was greater than their assimilation for all frond lengths, which suggested that these elements are transported to other tissues for storage (e.g., in holdfast) or release (e.g., from frond apices).