Relation Between Calcium and Strontium Transport Rates as Determined Simultaneously in the Primary Root of <i>Zea mays</i>

Hutchin, Maxine E.; Vaughan, B.E.

doi:10.1104/pp.42.5.644

Cited by 10 publications

(6 citation statements)

References 8 publications

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“…E = E. - (11,20 16 mv/log unit between 0.01 and l.OX and 11 mv/log unit between 1.0 and lOX are appreciably less than those for similar concentrations of KI salts alone (Fig. 2).…”

Section: Theorymentioning

confidence: 76%

Effects of External Cations and Respiratory Inhibitors on Electrical Potential of the Xylem Exudate of Excised Corn Roots

Davis

Higinbotham

1969

Plant Physiol.

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Abstract. Glass capillary microelectrodes were used to study the electrical potential difference (PD) between the xylem exudate of excised corn roots, Zea mays L. Golden Bantam hybrid, and the external solution. A survey of the effects of various ions on the PD was made. With 1 mM single salt solutions, the PD was between 25 and 50 mv, exudate negative. The PD responded to concentration differences in single salt solutions of K+, Na, and Ca2 in a manner suggestive of cation selectivity and cation diffusion potentials. With Ca2+ present, the PD was insensitive to concentration changes of other cations. Substitution of N03-for ClI in K+ solutions increased the PD by 2 to 5 mv, although in general the PD showed little response to anion concentration changes. The PD was partially abolished by cyanide. The remaining fraction of the PD was sensitive to concentration changes in external K+, and we postulate that the PD is the result of both a diffusion potential and an eleotrogenic pump. Electrical potential differences (PD's) of about 50 mv, exudate negative, exist between the xylem exudate of excised roots and the medium (1,2,3,19,25,31,32,35,36). Bowling and associates considered these PD's to be diffusion potentials (1, 2, 3).These workers also considered cation influx to be passive but anion influx, an electrochemically uphill process, wvas ascribed to an active transport process.Lundegardh (25, 26) and others (31, 35, 36) considered the PD to result from hydrogen ion diffusion potentials between the root surface and the external medium; deviation from hydrogen electrode ideality was thought to result from the modifving action of metal ions. Recently Shone (32) has studied the electrochemical relations of K+, Ca , Cl-and S042 in transport to the exudate and the effect of 2,4-dinitrophenol on these relations. His data suggest that electrochemical gradients may not permit a clear (listinction between passive and active transport in the root system.

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“…E = E. - (11,20 16 mv/log unit between 0.01 and l.OX and 11 mv/log unit between 1.0 and lOX are appreciably less than those for similar concentrations of KI salts alone (Fig. 2).…”

Section: Theorymentioning

confidence: 76%

Effects of External Cations and Respiratory Inhibitors on Electrical Potential of the Xylem Exudate of Excised Corn Roots

Davis

Higinbotham

1969

Plant Physiol.

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“…Mean values and SEM were calculated between the indicated perfusion times. The corn data are from a previotus report (15). Difference significant at P <0.05 is denoted by* (Cochran "t" test).…”

Section: Methodsmentioning

confidence: 99%

“…Earlier work done in this Laboratory established polar transport characteristics of calcium and strontium in isolated segments of Zea wilavs (10,32 of competitive inhibition were studied also in corn (15). The purpose of the present studies was to compare vetch, barley and pine tunder the same conditions previously used for corn.…”

mentioning

confidence: 95%

Relation Between Simultaneous Ca and Sr Transport Rates in Isolated Segments of Vetch, Barley, and Pine Roots

Hutchin¹,

Vaughan²

1968

Plant Physiol.

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Abstract. Root segments of vetch, barley, and pine were exposed to a nutrient solution containing 85Sr and 45Ca tracers. Translocation was measured from solutions containing stable ions at concentrations of 2.5 mM Ca, and at either 0.5 mM or 2.5 mM Sr. Polar transport was established between 12 and 18 hr in barley, and between 16 and 22 hr in vetch. Acropetal transport remained below 5 % of basipetal transport of tracer during these intervals. Transport in both vetch and barley usually deolined before an elapsed time of 24 hr unlike corn, which maintained its steady state beyond 24 hr. Pine was radically different in that it showed no difference between acropetal and basipetal transport rates and had very low rates. Sr transport in all plants studied to date paralleled that of Ca and the ratio Sr:Ca transported was equal to the ratio Sr:Ca in the nutrient. In vetch, stable Ca transport was reduced to one-fifth when Sr concentration was increased from 0.5 mM to 2.5 mM. Yet stable Sr transport did not change, indicating that the effect on transport was not due to competitive inhibition. A similar effect was less pronounced in barley, but could not be detected in pine. The magnitude of the transport rates varied considerably among the various species, corn having the greatest followed by barley, vetch, and pine in decreasing order. Transport did not correlate with root weight or surface area; it amounted to from 0.03 to 0.60 nanomoles per hr in these experiments as oompared to 7 nanomoles per hr previously established in corn (in all cases, 55 mm segments, sectioned 10 mm from apex).Several investigators have shown that the rates of translocation of strontium or calcium tracers from the roots can vary significantlv among different plants (11,18,20, 23,26,28,29 of competitive inhibition were studied also in corn (15). The purpose of the present studies was to compare vetch, barley and pine tunder the same conditions previously used for corn. Vicia sativa (common vetch) was cho-en as a representative dicotyledon, and its roots could be studied in the perfusion bridge previously described (10, 32). Also. since it is a common pasture plant. measurement of its strontium transport might be directly applicable to fallout contamination problems. Pinlts radiata was selected as a representative gymnosperm. Barley was included as an additional monocotyledon that has been widely studied. Materials and Methods

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“…We interpret the relatively high strontium concentrations found in A. bivenosa as an effect of high calcium uptake. Strontium is recognized as a biogeochemical analogue for calcium (Ichikuni and Musha, 1978;Pors Nielsen, 2004), and investigators have long acknowledged a relationship between their uptake in vascular plants (Williams and David, 1963;Hutchin and Vaughan, 1967). This relationship is reflected by a correlation between calcium and strontium in every species in this study (Fig.…”

Section: Discussionmentioning

confidence: 64%

Excessive sulphur accumulation and ionic storage behaviour identified in species ofAcacia(Leguminosae: Mimosoideae)

Reid

Robson

Radcliffe³

et al. 2016

Ann Bot

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The thiophores studied exhibit a tight coupling between sulphur and calcium uptake and storage, and apparently store these elements as inorganic salts within the cells of their foliage. Thiophore behaviour is a constitutive trait shared by closely related Acacia but is not highly prevalent within, nor exclusive to, xerophytes. Several of the newly identified thiophores occupy coastal or riparian habitats, suggesting that the evolutionary and ecophysiological explanations for this trait do not lie solely in adaptation to arid conditions or gypsiferous soils.

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Relation Between Calcium and Strontium Transport Rates as Determined Simultaneously in the Primary Root of Zea mays

Abstract: Suimnory}. Root

Cited by 10 publications

References 8 publications

Effects of External Cations and Respiratory Inhibitors on Electrical Potential of the Xylem Exudate of Excised Corn Roots

Effects of External Cations and Respiratory Inhibitors on Electrical Potential of the Xylem Exudate of Excised Corn Roots

Relation Between Simultaneous Ca and Sr Transport Rates in Isolated Segments of Vetch, Barley, and Pine Roots

Excessive sulphur accumulation and ionic storage behaviour identified in species ofAcacia(Leguminosae: Mimosoideae)

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