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- Title
Temperature Response and Effect of Ca<sup>2+</sup> and Mg<sup>2+</sup> on ATPases from Roots of Oats and Wheat as Influenced by Growth Temperature and Nutritional Status.
- Authors
Kähr, M.; Møller, I. Max
- Abstract
Activation by Ca2+, Mg2+ Zn2+ or Mn2+ of adenosine triphosphatases in a microsomal fraction from wheat roots depends upon the growth temperature when the plants are grown under low salt conditions, but not when the plants get a full-strength culture medium. At low ionic strength, cultivation at 25°C gives only half as high activation as cultivation at 18°C or at high ionic strength at both temperatures. Corresponding data for activation of ATPases from oats also show that low ionic strength during growth gives the highest temperature dependence. Low temperature together with low salt conditions during growth gives the highest ATPase activity after stimulation with divalent cations. High growth temperature and full-strength medium decrease the ATPase activity. Activation energies (Ea) were calculated for the two temperature intervals 35-20°C and 20-5°C. The dominating ATPase stimulation (Ca2+ in wheat, Mg2+ in oats) is characterized by high specific activity combined with a low Ea value. The differences in ATPase activity between oats and wheat can he correlated with different cultivation requirements known from agriculture.
- Subjects
ADENOSINE triphosphatase; PHOSPHATASES; WHEAT; EFFECT of temperature on plants; LOW temperatures; PLANT development; PLANT physiology
- Publication
Physiologia Plantarum, 1976, Vol 38, Issue 3, p153
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/j.1399-3054.1976.tb03982.x