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Plant Physiology 69:187-191 (1982)
© 1982 American Society of Plant Biologists

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Articles

ATP-Dependent Calcium Transport in Plasmalemma Preparations from Soybean Hypocotyls 1

EFFECT OF HORMONE TREATMENTS

B. Dorota Kubowicz2, Larry N. Vanderhoef3 and John B. Hanson

Department of Botany, University of Illinois, Urbana, Illinois 61801

A plasmalemma-enriched membrane preparation from etiolated soybean (Glycine max L., cv. Wayne) hypocotyls possesses an active ATP-dependent calcium pump which leads to calcium accumulation when assayed by the methods of Gross and Marmé (1978, Proc Natl Acad Sci USA 75: 1232-1236). Two-hour treatment of segments from the elongating zone of the hypocotyl with growth-promoting concentrations of indoleacetic acid gives up to 100 percent increase in the calcium transport activity. Conversely, similar pretreatment with zeatin or other cytokinins is inhibitory. In the meristematic and maturing zones of the hypocotyl, zeatin has the opposite effect of promoting calcium transport activity. One facet of cell-growth regulation may lie with hormonally mediated changes in efflux pumping of calcium.

2 Present address: Department of Plant Biology, Warsaw Agricultural University (SGGW), 26/30 Rakowieka Street, Warsaw 02-528, Poland.

3 Present address: Division of Agricultural and Life Sciences, University of Maryland, College Park, MD 20742.

1 Supported by National Science Foundation Grants PCM 77-14175 (to L. N. V.) and PCM 79-13406 (to J. B. H.).




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