ATP-Dependent Calcium Transport in Plasmalemma Preparations from Soybean Hypocotyls : EFFECT OF HORMONE TREATMENTS.
TLDR
A plasmalemma-enriched membrane preparation from etiolated soybean possesses an active ATP-dependent calcium pump which leads to calcium accumulation when assayed by the methods of Gross and Marmé.Abstract:
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 Marme (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.read more
Citations
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Molecular and Biochemical Evidence for the Involvement of Calcium/Calmodulin in Auxin Action
Tianbao Yang,B. W. Poovaiah +1 more
TL;DR: The use of 35S-labeled calmodulin (CaM) to screen a corn root cDNA expression library has led to the isolation of a CaM-binding protein, encoded by a cDNA with sequence similarity to small auxin up RNAs (SAURs), a class of early auxin-responsive genes, which provides the first direct evidence for the involvement of calcium/CaM-mediated signaling in aux in-situ signal transduction.
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A Ca2+/H+ Antiport System Driven by the Proton Electrochemical Gradient of a Tonoplast H+-ATPase from Oat Roots
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H. David Hammond,Emanuel Epstein +1 more
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CHAPTER TWO – The Essential Nutrient Elements: Requirements and Interactions in Plants
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Effect of External K, NH4, Na, Ca, Mg, and H Ions on the Cell Transmembrane Electropotential of Avena Coleoptile
TL;DR: The results of similar studies of animal cells and of giant cells of algae show that the resting electropotentials have an approximate quantitative relationship to the concentration gradient at equilibrium of the ions K+, Na+, and Cl-.
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Relation of 2,4-D-Induced Growth Aberrations to Changes in Nucleic Acid Metabolism in Soybean Seedlings
TL;DR: The results are consistent with the view that the herbicidal action of 2,4-D is associated with the renewal of RNA and protein synthesis leading to massive tissue proliferation, disorganized growth, and finally death of the plant.