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- Title
Hormonal Regulation of Ca<sup>2+</sup>-Stimulated K<sup>+</sup> Influx and Ca<sup>2+</sup>, K<sup>+</sup>-ATPase in Rice Roots: in vivo and in vitro Effects of Auxins and Reconstitution of the ATPase.
- Authors
ERDEI, LÁSZLÓ; TÓTH, ILDIKÓ; ZSOLDOS, FERENC
- Abstract
The role of natural and synthetic auxins in regulation of ion transport and ATPase activity was studied in rice roots (Oryza saliva L. cv. Dunghan Shali). In vivo treatment of seedlings with 2,4-dichlorophenoxyacctic acid at 2 × 10-6 M for a short period enhanced subsequent Ca2+ stimulated K+ influx and Ca2+, K+ APTase activity, while a longer treatment diminished both K+ influx and ATPase activity. Indoleacetic acid at 10-10-10-8 M induced ATPase activity. In in vitro experiments both 2,4 dichlorophenoxyacetic acid and indoleacetic acid (10-10-10-8M) stimulated Ca2+, K+-ATPase activity of a plasmalemma-rich microsomal fraction from the roots. Acetone extracted ATPase preparations lost their activity. The enzyme regained its activity and its sensitivity towards ions (Ca2+ + K+) when reconstituted with phosphatidyl choline. Addition of auxins also indicated that the presence of the lipid was necessary in the interaction between the ATPase and auxins. Auxins and ions probably interact with the intact ATPase lipoprotein complex. which may possess a receptor site for the auxins, possibly as a sub unit.
- Subjects
DICHLOROPHENOXYACETIC acid; PLANT hormones; ACETIC acid; EXOCRINE secretions; SPUTUM; VITAMIN B complex
- Publication
Physiologia Plantarum, 1979, Vol 45, Issue 4, p448
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/j.1399-3054.1979.tb02612.x