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Activity and properties of ribulose‐1,5‐bisphosphate carboxylase of sugarbeet plants grown under saline conditions
Year:
1982
Source of publication :
Physiologia Plantarum
Authors :
הויאר, ברוריה
;
.
פלאוט, צבי
;
.
Volume :
54
Co-Authors:
Heuer, B., Dept. of Environmental Physiology, Inst. of Soils and Water, ARO, Volcani Center, P.O.B. 6, Bet Dagan, 50-200, Israel
Plaut, Z., Dept. of Environmental Physiology, Inst. of Soils and Water, ARO, Volcani Center, P.O.B. 6, Bet Dagan, 50-200, Israel
Facilitators :
From page:
505
To page:
509
(
Total pages:
5
)
Abstract:
Activity and properties of sugar beet (Beta vulgaris var. Polyrave) leaf ribulose‐1,5‐bisphosphate (RuBP) carboxylase were investigated following the exposure of plants to NaCl in the range of 45 to 270 mM for 7 days. An enhancement in RuBP carboxylase activity was found both in crude extracts and in purified preparations following plant exposure to 180 mM NaCl. Kinetic properties of the enzyme were significantly affected by salinity as determined by a 4.5 fold increase in Km [HCO‐ 3] and Km [CO2], and a Vmax increase of 50%. Data based on polyacrylamide‐gel‐electrophoresis suggest that the molecular weight of the small subunit of RuBP carboxylase was reduced from 15,500 to 12,500 in plants grown under salinity. The large subunit was much less affected and no change was found in the whole enzyme. The enzyme isolated from plants exposed to salinity contained about 50% fewer titratable SH groups as compared with the control. The results indicate that in this plant, mild salt concentrations induced conformational changes in RuBP carboxylase which may be responsible for its tolerance to semi‐salinity. Copyright © 1982, Wiley Blackwell. All rights reserved
Note:
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More details
DOI :
10.1111/j.1399-3054.1982.tb00717.x
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
28390
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:38
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Scientific Publication
Activity and properties of ribulose‐1,5‐bisphosphate carboxylase of sugarbeet plants grown under saline conditions
54
Heuer, B., Dept. of Environmental Physiology, Inst. of Soils and Water, ARO, Volcani Center, P.O.B. 6, Bet Dagan, 50-200, Israel
Plaut, Z., Dept. of Environmental Physiology, Inst. of Soils and Water, ARO, Volcani Center, P.O.B. 6, Bet Dagan, 50-200, Israel
Activity and properties of ribulose‐1,5‐bisphosphate carboxylase of sugarbeet plants grown under saline conditions
Activity and properties of sugar beet (Beta vulgaris var. Polyrave) leaf ribulose‐1,5‐bisphosphate (RuBP) carboxylase were investigated following the exposure of plants to NaCl in the range of 45 to 270 mM for 7 days. An enhancement in RuBP carboxylase activity was found both in crude extracts and in purified preparations following plant exposure to 180 mM NaCl. Kinetic properties of the enzyme were significantly affected by salinity as determined by a 4.5 fold increase in Km [HCO‐ 3] and Km [CO2], and a Vmax increase of 50%. Data based on polyacrylamide‐gel‐electrophoresis suggest that the molecular weight of the small subunit of RuBP carboxylase was reduced from 15,500 to 12,500 in plants grown under salinity. The large subunit was much less affected and no change was found in the whole enzyme. The enzyme isolated from plants exposed to salinity contained about 50% fewer titratable SH groups as compared with the control. The results indicate that in this plant, mild salt concentrations induced conformational changes in RuBP carboxylase which may be responsible for its tolerance to semi‐salinity. Copyright © 1982, Wiley Blackwell. All rights reserved
Scientific Publication
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