Work

Aluminum Effects on Calcium Fluxes at the Root Apex of Aluminum-Tolerant and Aluminum-Sensitive Wheat Cultivars

Year: 1992

Type: article

Abstract: The role of Ca(2+) transport in the mechanism of Al toxicity was investigated, using a Ca(2+)-selective microelectrode system to study Al effects on root apical Ca(2+) fluxes in two wheat (Triticum aestivum L.) cultivars: Al-tolerant Atlas 66 and Al-sensitive Scout 66. Intact 3-day-old low-salt-grown (100 micromolar CaCl(2), pH 4.5) wheat seedlings were used, and it was found that both cultivars maintained similar rates of net Ca(2+) uptake in the absence of Al. Addition of Al concentrations that were toxic to Scout (5-20 micromolar AlCl(3)) immediately and dramatically inhibited Ca(2+) uptake in Scout, whereas Ca(2+) transport in Atlas was relatively unaffected. The Al-induced inhibition of Ca(2+) uptake in Scout 66 was rapidly reversed following removal of Al from the solution bathing the roots. Similar studies with morphologically intact root cell wall preparations indicated that the Al effects did not involve Al-Ca interactions in the cell wall. These results suggest that Al inhibits Ca(2+) influx across the root plasmalemma, possibly via blockage of calcium channels. The differential effect of Al on Ca(2+) transport in Al-sensitive Scout and Al-tolerant Atlas suggests that Al blockage of Ca(2+) channels could play a role in the cellular mechanism of Al toxicity in higher plants.

Source: PLANT PHYSIOLOGY

DOI: 10.1104/pp.98.1.230

Authors: Jianwei W. Huang, Jon E. Shaff, David L. Grunes, Leon V. Kochian

Institution: Cornell University

Language: English

Topic: Aluminum toxicity and tolerance in plants and animals

Subfield: Plant Science

Field: Agricultural and Biological Sciences

Domain: Life Sciences

SDG: Zero hunger

Open Access status: green

OpenAlex ID: W1966908922