Wayne R, Staves MP, Rutzke M.

Plant Physiol. 1993 May; 102: 14.

Section of Plant Biology, Cornell University, Ithaca, NY 14853.

Three distinct classes of Ca2+ channels coexist on the plasma membrane of Chara internodal cells and we are using Sr2+ as a tracer to study Ca2+ influx through these channels. Ca2+ channel blockers, which inhibit gravisensing and E-C coupling, effectively inhibit Sr2+ influx into Chara internodal cells. The ability of the channel blockers to inhibit Sr2+ influx depends on the site of their application which corresponds to the site at which they inhibit the physiological responses. Nifedipine and verapamil, which block class I Ca2+ channels, and omega-conotoxin which blocks class II Ca2+ channels, inhibit Sr2+ influx only when applied to the ends of internodal cells, where these channels are localized. The lanthanides, which block the uniformly distributed class III Ca2+ channels, block Sr2+ influx wherever they are applied.

Publication Types:

• Meeting Abstracts

Keywords:

• Cell Membrane
• Cesium
• Chromosomes
• Nifedipine
• Verapamil
• antagonists & inhibitors
• genetics
• omega-Conotoxin GVIA
• omega-Conotoxins
• NASA Discipline Number 40-50
• NASA Discipline Plant Biology
• NASA Program Space Biology
• Non-NASA Center

Other ID:

• 95607648

UI: 102212617

From Meeting Abstracts