Salinity response of a freshwater charophyte, Chara vulgaris
Salinity response of a freshwater charophyte, Chara vulgaris
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淡水轮藻植物 Chara vulgaris 的盐度响应
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
G. Kirst
中科院分区：
文献类型：
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作者：
U. Winter;G. Kirst
摘要普通轮藻生长在寡盐湖适应实验室条件，并进行长期的盐度处理范围从0至350摩尔m-3 NaCl添加到湖水（40-680 mosmol kg-1）。测定了中央节间细胞液泡液中K+、Na+、Mg ~（2+）、Cl和蔗糖的渗透势和浓度。C.寻常型调节膨压，但不完全。膨压从335 mosmol kg-1在控制条件下下降到52-111 mosmol kg-1在350 mol m-3 NaCl。增加离子浓度和蔗糖浓度均能提高πi值。不育株和可育株对渗透胁迫的反应不同。在不育植株中，离子约占液泡渗透势的87%。渗透胁迫下πi的增加完全是由于Na+和Cl-的积累。在可育植株中，蔗糖约占πi的35%，离子约占51%。在渗透胁迫下，蔗糖含量随Na+和Cl-离子含量的增加而增加。
Abstract.Chara vulgaris L. growing in an oligohaline lake was adapted to laboratory conditions and subjected to long-term salinity treatments ranging from 0 to 350 mol m 3 NaCl added to the lake water (40–680 mosmol kg 1). Osmotic potential and concentration of the main osmotically active solutes (K+, Na+, Mg2+, Cl and sucrose) in the vacuolar sap of the central internodal cells were estimated. C. vulgaris did regulate turgor but incompletely. Turgor decreased from 335 mosmol kg 1 under control conditions to 52–111 mosmol kg 1 at 350 mol m 3 NaCl. The enhancement of πi was achieved by increase in both ions and sucrose. Sterile and fertile plants differed in their response to osmotic stress. In sterile plants, the ions accounted for about 87% of the vacuolar osmotic potential. The increase of πi under osmotic stress was exclusively due to an accumulation of Na+ and Cl-. In fertile plants, sucrose accounted for about 35% of πi and ions for about 51% Under osmotic stress, sucrose content increased together with the ionic content of Na+ and Cl-.