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Effects of cold on NAD + kinase activity in winter rape plants
Author(s) -
Maciejewska Urszula
Publication year - 1990
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1990.tb04386.x
Subject(s) - nad+ kinase , calmodulin , brassica , kinase , chemistry , enzyme , biochemistry , biology , botany
Low temperature (2°C) caused an increase in the activity of NAD + kinase (EC 2.7.1.23) in leaves of winter rape plants ( Brassica napus L. var. oleifera L. cv. Górezański). The enzyme activity markedly increased between day 4 and 11 of plant exposure to cold, then tended to decrease. Changes in activity of NAD + kinase coincided with the previously observed changes in the levels of pyridine nucleotides, NADP(H) (U. Maciejewska and A. Kacperska, Physiol. Plant. 69: 687–691, 1987). As a result of cold treatment, Ca 2+ –calmodulin–dependent and Ca 2+ –calmodulin–independent NAD + kinase activities increased to almost the same extent. It seems therefore, that the cold–induced activation of NAD + kinase does not depend on the Ca 2+ –calmodulin complex.