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| Publication Type:
| Refereed |
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| Author(s): | Rengel, Zdenko;
Robinson, Donald L. |
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| Author Affiliation: | Department of Agronomy, Louisiana Agricultural Experiment Station, Louisana State University Agricultural Center, Baton Rouge, LA |
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| Title: | Competitive Al3+ Inhibition of Ner Mg2+ Uptake by Intact Lolium multiflorum Roots1 |
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| Source: | Plant Physiology. Vol. 91, No. 4, December 1989, p. 1407-1413. |
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| Publishing Information: | Lancaster, PA: American Society of Plant Physiologists |
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| Keywords: | TIC Keywords: Lolium multiflorum; Uptake; Absorption; Resistance; Ph
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| Abstract/Contents: | "Aluminum impairs uptake of Mg2+, but the mechanisms of this inhibition are not understood. The depletion technique was used to monitor net Mg2+ uptake from nutient solution by intact, 23-day-old plants of ryegrass(Lolium multiflorum Lam., cv Gulf and Wilo). Activities of Mg2+ and monomeric Al species in nutrient solution were calculated and used as the basis for expressing the results. The kinetics of net Mg2+ absorption was resolved into (a) a transpiration-dependent uptake component, (b) a metabolically mediated, discontinuous saturable component that is Al3+ sensitive and p-chloromercuribenzene sulfonic acid(PCMBS) resistant, and (c) a linear, carbonyl cyanide m-chlorophenylhydrazone resistant, Al3+ sensitive component that might be atype of facilitated diffusion. Lowering the pH from 6.0 to 4.2 exerted a noncompetitive inhibition of net Mg2+ uptake, while aluminum at 6.6 micromolar Al3+ activity exerted competitive inhibition of net Mg2+ uptake at pH 4.2. The Al3+ -induced effect was obvious after 30 minutes. Cultivar-specific ability to retain a higher affinity for Mg2+ by postulated transport protiens in the presence of Al3+ might be one of the mechanisms of differential Al tolerance among ryegrass cultivars." |
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| Language: | English |
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| References: | 34 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Rengel, Z., and D. L. Robinson. 1989. Competitive Al3+ Inhibition of Ner Mg2+ Uptake by Intact Lolium multiflorum Roots1. Plant Physiol. 91(4):p. 1407-1413. |
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