Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via CrossRef
Right arrow Citing Articles via Web of Science (53)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Ryan, P. R.
Right arrow Articles by Kochian, L. V.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Ryan, P. R.
Right arrow Articles by Kochian, L. V.
Agricola
Right arrow Articles by Ryan, P. R.
Right arrow Articles by Kochian, L. V.

PLANT PHYSIOLOGY , Vol 102, Issue 3 975-982, Copyright © 1993 by American Society of Plant Biologists

ENVIRONMENTAL AND STRESS PHYSIOLOGY

Interaction between Aluminum Toxicity and Calcium Uptake at the Root Apex in Near-Isogenic Lines of Wheat (Triticum aestivum L.) Differing in Aluminum Tolerance

P. R. Ryan and L. V. Kochian
United States Plant, Soil, and Nutrition Laboratory, United States Department of Agriculture-Agricultural Research Service, Cornell University, Ithaca, New York 14853

Aluminum (Al) is toxic to plants at pH < 5.0 and can begin to inhibit root growth within 3 h in solution experiments. The mechanism by which this occurs is unclear. Disruption of calcium (Ca) uptake by Al has long been considered a possible cause of toxicity, and recent work with wheat (Triticum aestivum L. Thell) has demonstrated that Ca uptake at the root apex in an Al-sensitive cultivar (Scout 66) was inhibited more than in a tolerant cultivar (Atlas 66) (J.W. Huang, J.E. Shaff, D.L. Grunes, L.V. Kochian [1992] Plant Physiol 98: 230-237). We investigated this interaction further in wheat by measuring root growth and Ca uptake in three separate pairs of near-isogenic lines within which plants exhibit differential sensitivity to Al. The vibrating calcium-selective microelectrode technique was used to estimate net Ca uptake at the root apex of 6-d-old seedlings. Following the addition of 20 or 50 [mu]M AlCl3, exchange of Ca for Al in the root apoplasm caused a net Ca efflux from the root for up to 10 min. After 40 min of exposure to 50 [mu]M Al, cell wall exchange had ceased, and Ca uptake in the Al-sensitive plants of the near-isogenic lines was inhibited, whereas in the tolerant plants it was either unaffected or stimulated. This provides a general correlation between the inhibition of growth by Al and the reduction in Ca influx and adds some support to the hypothesis that a Ca/Al interaction may be involved in the primary mechanism of Al toxicity in roots. In some treatments, however, Al was able to inhibit root growth significantly without affecting net Ca influx. This suggests that the correlation between inhibition of Ca uptake and the reduction in root growth may not be a mechanistic association. The inhibition of Ca uptake by Al is discussed, and we speculate about possible mechanisms of tolerance.


This article has been cited by other articles:


Home page
 Plant Cell PhysiolHome page
J. L. Yang, J. F. You, Y. Y. Li, P. Wu, and S. J. Zheng
Magnesium Enhances Aluminum-Induced Citrate Secretion in Rice Bean Roots (Vigna umbellata) by Restoring Plasma Membrane H+-ATPase Activity
Plant Cell Physiol., January 1, 2007; 48(1): 66 - 73.
[Abstract] [Full Text] [PDF]

Home page
 Plant Cell PhysiolHome page
P. Bhuja, K. McLachlan, J. Stephens, and G. Taylor
Accumulation of 1,3-{beta}-D-glucans, in Response to Aluminum and Cytosolic Calcium in Triticum aestivum
Plant Cell Physiol., May 15, 2004; 45(5): 543 - 549.
[Abstract] [Full Text] [PDF]

Home page
 Plant Physiol.Home page
B. Ezaki, M. Suzuki, H. Motoda, M. Kawamura, S. Nakashima, and H. Matsumoto
Mechanism of Gene Expression of Arabidopsis Glutathione S-Transferase, AtGST1, and AtGST11 in Response to Aluminum Stress
Plant Physiology, April 1, 2004; 134(4): 1672 - 1682.
[Abstract] [Full Text] [PDF]

Home page
 J Exp BotHome page
J. R. Cumming and J. Ning
Arbuscular mycorrhizal fungi enhance aluminium resistance of broomsedge (Andropogon virginicus L.)
J. Exp. Bot., May 1, 2003; 54(386): 1447 - 1459.
[Abstract] [Full Text] [PDF]

Home page
 Plant Cell PhysiolHome page
T. Sasaki, B. Ezaki, and H. Matsumoto
A Gene Encoding Multidrug Resistance (MDR)-Like Protein is Induced by Aluminum and Inhibitors of Calcium Flux in Wheat
Plant Cell Physiol., February 1, 2002; 43(2): 177 - 185.
[Abstract] [Full Text] [PDF]

Home page
 J Exp BotHome page
P. S. Kidd and J. Proctor
Effects of aluminium on the growth and mineral composition of Betula pendula Roth
J. Exp. Bot., June 1, 2000; 51(347): 1057 - 1066.
[Abstract] [Full Text] [PDF]

Home page
 Plant Physiol.Home page
M. A. Piñeros, J. E. Shaff, and L. V. Kochian
Development, Characterization, and Application of a Cadmium-Selective Microelectrode for the Measurement of Cadmium Fluxes in Roots of Thlaspi Species and Wheat
Plant Physiology, April 1, 1998; 116(4): 1393 - 1401.
[Abstract] [Full Text]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1993 by the American Society of Plant Biologists