This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Web of Science (18) Citing Articles via Google Scholar Google Scholar Articles by Rickauer, M. Articles by Tanner, W. Search for Related Content PubMed PubMed Citation Articles by Rickauer, M. Articles by Tanner, W. Agricola Articles by Rickauer, M. Articles by Tanner, W.

Articles

Effects of Ca²⁺ on Amino Acid Transport and Accumulation in Roots of Phaseolus vulgaris¹

Institut für Botanik, Universität Regensburg, 8400 Regensburg, Federal Republic of Germany

Ca²⁺ stimulates the uptake of -aminoisobutyric acid (AIB) into excised or intact Phaseolus vulgaris L. roots by a factor of two. In roots depleted of Ca²⁺ by preincubation with ethylenediaminetetraacetate, ethyleneglycol-bis(-aminoethyl ether)-N,N'-tetraacetic acid, or streptomycin, the stimulatory effect is 7- to 10-fold. In the presence of Ca²⁺, roots accumulate AIB more than 100-fold; Ca²⁺-depleted roots only equilibrate with AIB. Radioautography shows [¹⁴C]AIB to be present in all cells after 90 min. Although Ca²⁺-depleted roots lose accumulated [¹⁴C]AIB about 10 times faster than roots supplied with Ca²⁺, this increased efflux is not the main cause for the decrease in net uptake observed. The latter is rather due to a less negative membrane potential in Ca²⁺ depleted roots (–120 mV –50 mV). The basic feature explaining all the results of Ca²⁺ deficiency is an increase in general membrane permeability. No indication of a specific regulatory function of Ca²⁺ in membrane transport of roots has been obtained.

This article has been cited by other articles:

				L. L. Ge, H. Q. Tian, and S. D. Russell Calcium function and distribution during fertilization in angiosperms Am. J. Botany, June 1, 2007; 94(6): 1046 - 1060. [Abstract] [Full Text] [PDF]

				C. Delétage-Grandon, J.-F. Chollet, M. Faucher, F. Rocher, E. Komor, and J.-L. Bonnemain Carrier-Mediated Uptake and Phloem Systemy of a 350-Dalton Chlorinated Xenobiotic with an {alpha}-Amino Acid Function Plant Physiology, April 1, 2001; 125(4): 1620 - 1632. [Abstract] [Full Text]