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Publication Type:
| Refereed |
Author(s): | Rengel, Zdenko;
Elliott, Daphne C. |
Author Affiliation: | School of Biological Sciences, Flinders University of South Australia, GPO Box 2100, Adelaide S.A. 5001, Australia |
Title: | Mechanism of aluminum inhibition of net 45Ca2+ uptake by Amaranthus protoplasts |
Source: | Plant Physiology. Vol. 98, No. 2, February 1992, p. 632-638. |
Publishing Information: | Lancaster, PA: American Society of Plant Physiologists |
Keywords: | TIC Keywords: Aluminum; Amaranthus tricolor; Protoplasts; Uptake; Growth factors; Calcium
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Abstract/Contents: | "Calcium ions serve as a second messenger in signal transduction and metabolic regulation. Effects of Al on calcium homeostasis remain to be elucidated. Short-term net 45Ca2+ uptake by Amaranthus tricolor protoplasts was monitored from uptake media prepared to test the influence of pH, Al, and various inhibitors. Accumulation of 45Ca2+ increased during the first 3 to 6 minutes and then leveled off or declined. Al and Ca2+ channel blockers (verapamil and bepridil) decreased net 45CA2+ uptake. This decrease was more pronounced when Al and bepridil were both present in uptake media, but Al did not aggravate verapamil-induced reduction of net 45Ca2+ uptake. Erythrosin B and calming dazolium each increased net 45Ca2+ uptake, probably by interfering with Ca2+ efflux. This effect was undetectable in the presence of Al. Mycophenolic acid decreased net 45Ca2+ uptake; guanosine alleviated this effect. Al-induced reduction of net 45Ca2+ uptake was not aggravated by mycophenolic acid. Net 45Ca2+ uptake was not aggravated by mycophenolic acid. Net 45Ca2+ uptake was generally less at pH 4.5 than at 5.5 for all treatments. It is concluded that Al ions affect net 45Ca2+ uptake by binding to the verapamil-specific channel site that is different from the bepridil-specific one, as well as by interfering with the action of guanosine 5'-triphosphate-binding proteins." |
Language: | English |
References: | 30 |
Note: | Graphs |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Rengel, Z., and D. C. Elliott. 1992. Mechanism of aluminum inhibition of net 45Ca2+ uptake by Amaranthus protoplasts. Plant Physiol. 98(2):p. 632-638. |
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