The effects of Ca2+ and K+ on the ATPase activities of microsomal fractions prepared from mature roots, cell suspension and callus cultures and redifferentiated roots of rice (Oryza sativa L. cv. Dunghan Shali) exhibit correlations with the effects of Ca2+ on the K+ influx rates. ATPase stimulated by Ca2+ and K+ and the stimulatory effect of Ca2+ on K+ influx are associated in mature roots of low‐salt status. Roots of high‐salt status also possess ATPase of this kind, but K+ influx is depressed by Ca2+. Cell suspension and callus tissue cultures do not possess K+ influx with a positive Ca2+‐response and the ATPase prepared from them is insensitive to the effects of Ca2+ and K+. Redifferentiated roots show similar transport characteristics and enzyme pattern as mature roots of high salt status. The specific transport function of the membrane, and the ATPase stimulated by Ca2+ and K+ are suggested to develop during diffrentiation.
|Number of pages||5|
|Publication status||Published - 1977|
ASJC Scopus subject areas
- Plant Science
- Cell Biology