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Salinity response of a freshwater charophyte, Chara vulgaris
Author(s) -
WINTER U.,
KIRST G. O.
Publication year - 1990
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1990.tb01284.x
Subject(s) - turgor pressure , chara , sucrose , salinity , osmoregulation , osmotic pressure , osmotic shock , osmotic concentration , botany , sodium , chemistry , biology , horticulture , food science , biochemistry , ecology , organic chemistry , gene
. 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 + , Mg 2+ , 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 π i 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 π i under osmotic stress was exclusively due to an accumulation of Na + and Cl ‐ . In fertile plants, sucrose accounted for about 35% of π i and ions for about 51% Under osmotic stress, sucrose content increased together with the ionic content of Na + and Cl ‐ .