Zagdańska B
Department of Plant Biochemistry and Physiology, Institute of Plant Breeding and Acclimatization, Warszawa, Poland.
Acta Biochim Pol. 1990;37(3):385-9.
Total NAD kinase activity remained unaltered in the drought non-adapted wheat leaves under water deficit, but gradually decreased with water deficit in the adapted ones. The share of the calmodulin-dependent enzyme was significantly higher in the drought-hardened than in non-hardened plants; however, under severe water deficit the activity of the enzyme dropped by half. It seems, therefore, that NAD kinase activity does not limit phosphorylation of NAD in dehydrated plant tissues.
在水分亏缺条件下，未适应干旱的小麦叶片中总NAD激酶活性保持不变，但适应干旱的小麦叶片中该活性随水分亏缺而逐渐降低。在干旱锻炼的植株中，依赖钙调蛋白的酶的占比显著高于未锻炼的植株；然而，在严重水分亏缺时，该酶的活性下降了一半。因此，似乎NAD激酶活性并不限制脱水植物组织中NAD的磷酸化。
