Thermal sensitivities of malate dehydrogenase isozymes in Typha
- Univ. of South Carolina, Columbia
Two species of cattail, Typha latifolia L. and T. domingensis Pers., occur naturally along the shoreline of Par Pond, an 1.128 ha impoundment subjected to intermittent thermal stress at the Savannah River Plant in South Carolina. T. domingensis is not tolerant of the stresses imposed at the hottest section of this lake. Typha latifolia is established throughout the lake but at the hottest section displays an altered morphology compared with stands from ambient areas. Both T. latifolia and T. domingensis are electrophoreticaly monomorphic, and no variation in isozyme expression in ten enzyme systems was recorded in populations from Par Pond. The malate dehydrogenase (MDH) isozyme patterns for T. latifolia and T. domingensis are identical, but their thermal sensitivities differ sharply. All six major T. domingensis MDH isozymes are denatured by heating at 50/sup 0/C; whereas, T. latifolia has three isozymes which are stable at 50/sup 0/C and three isozymes which are denatured at this temperature. Tests of thermal stability are more useful than measurements of electrophoretic mobility in detecting enzyme differences and a possible biochemical basis for differences in thermal tolerance in these natural populations.
- OSTI ID:
- 6800236
- Journal Information:
- Am. J. Bot.; (United States), Journal Name: Am. J. Bot.; (United States) Vol. 65:2; ISSN AJBOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AQUATIC ORGANISMS
BIOLOGICAL EFFECTS
BIOLOGICAL STRESS
COMPARATIVE EVALUATIONS
DEHYDROGENASES
ENZYMES
ISOENZYMES
NATIONAL ORGANIZATIONS
NORTH AMERICA
OXIDOREDUCTASES
PLANTS
POLLUTION
POPULATIONS
SAVANNAH RIVER PLANT
SENSITIVITY
SOUTH CAROLINA
SOUTHEAST REGION
TEMPERATURE EFFECTS
THERMAL EFFLUENTS
US AEC
US DOE
US ERDA
US ORGANIZATIONS
USA
WATER POLLUTION