Premium
Adaptation and acclimation of higher plants at the enzyme level: Speed of acclimation for apparent energy of activation of NAD malate dehydrogenase in Lathyrus Japonicus Willd. (Leguminosae)
Author(s) -
SIMON JEANPIERRE
Publication year - 1979
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.1365-3040.1979.tb00771.x
Subject(s) - acclimatization , malate dehydrogenase , nad+ kinase , isozyme , biology , enzyme , dehydrogenase , adaptation (eye) , biochemistry , lathyrus , botany , neuroscience
The speed of acclimatory changes in apparent energy of activation ( E a ) of NAD malate dehydrogenase was analysed in four clones of Lathyms japonicus Willd. collected over a 16° latitudinal gradient in eastern North America. Plants were grown initially for six months at either 7° night/15° day or 22° night/30° days. Following reciprocal switches in these two contrasting thermo‐periods, energy of activation was relatively stable for 12 h, then oscillated until 48 h, and stabilized in about 72 h. The results suggest that the acclimation response in E a is not due to near‐instantaneous conformational changes in isozymes, but is directed primarily by temperature‐mediated structural and/or functional modifications during de novo synthesis of the forms of the enzymes.