OSMOTIC ADAPTATION IN ULVA-LACTUCA UNDER FLUCTUATING SALINITY REGIMES
OSMOTIC ADAPTATION IN ULVA-LACTUCA UNDER FLUCTUATING SALINITY REGIMES
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DOI：
10.1007/bf00394469
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发表时间：
1982-01-01
期刊：
影响因子：
4.3
通讯作者：
DAVENPORT, J
中科院分区：
文献类型：
--
作者：
DICKINSON, DMJ;JONES, RGW;DAVENPORT, J
本文研究了绿色潮间带植物乌藨子（U.莴苣，在2个波动的盐度制度;正弦和方波波动之间的30和100%的海水在12小时的周期。这些制度非常相似的盐度潮汐波动所遇到的在其自然河口栖息地。无机离子，K，Na，Cl和硫酸盐的变化的数据，在有机溶质，dimethylsulfoniopropionate，在总糖水平和估计的渗透压和膨压下的2个盐度制度的报告。在这些不同条件下的溶质响应的显着差异进行检测。更好地控制离子通量似乎是行使正弦条件下，也缓冲二甲基磺基丙酸盐水平的变化。钾的流入是高度依赖于光。氯离子水平显着未能达到稳定状态的水平，在6-h-高渗透压的突然或渐进的周期的一部分。这些数据，这可能更好地反映在自然环境中的渗透变化，和遇到的一些问题，特别是在某些条件下的电荷平衡占可能的意义，进行了讨论。
The osmotic responses were studied of the green intertidal alga, U. lactuca, under 2 fluctuating salinity regimes; sinusoidal and square-wave fluctuations between 30 and 100% sea water in a 12 h cycle. These regimes closely resemble the tidal fluctuation of salinity encountered by the alga in its natural estuarine habitat. Data on changes in the inorganic ions, K, Na, Cl and sulfate; in the organic solute, dimethylsulfoniopropionate; in the total sugar levels and estimated osmotic and turgor pressures under the 2 salinity regimes are reported. Significant differences in the solute responses under these different conditions were detected. Better control of ion fluxes appeared to be exercised under the sinusoidal conditions which also buffered changes in dimethylsulfoniopropionate levels. Influxes of K were highly light-dependent. Cl levels conspicuously failed to reach the steady-state levels in the 6-h-hyper-osmotic part of either the abrupt or gradual cycle. The possible significance of these data, which may better reflect osmotic changes in the natural environment, and some of the problems encountered, particularly in accounting for charge balance under some conditions, are discussed.