Osmoregulation or Turgor Regulation in Chara? | Zendy

Mary A. Bisson | Zendy; Dolores M. Bartholomew | Zendy

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Osmoregulation or Turgor Regulation in Chara?

Author(s) -

Mary A. Bisson,

Dolores M. Bartholomew

Publication year - 1984

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.74.2.252

Subject(s) - turgor pressure , chara , osmotic pressure , osmoregulation , botany , chemistry , biology , horticulture , salinity , ecology

Chara corallina Klein ex Willd. wm. R.D.W. (= C. australis R. Br.), a fresh water alga, maintains a constant internal osmotic pressure when external osmotic pressure is increased. This results in a decrease in turgor pressure. Chara osmoregulates effectively in the presence of high CaCl(2) and raffinose, but is less efficient in response to increased NaCl. Decreasing external pH from 7 to 5 results in a decrease in turgor, but increasing it to values as high as 9 has no effect. Increasing the daily amount of light from 0.5 to 24 hours has no effect on turgor.

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