About the Cover
On the Cover: Aluminum-resistant (alr)
mutants were isolated from Arabidopsis and found to possess two
distinctly different mechanisms of Al resistance. alr
mutants that mapped to a locus on chromosome 1 exhibited a root apex
Al-exclusion mechanism that correlated with increased release of
Al-chelating organic acids. An alr mutant that mapped to
a locus on chromosome 4 excluded Al from the root apex via a different
mechanism involving an Al-induced stimulation of H+ influx
along the root apex. This mutant provides the first evidence for an Al
resistance mechanism based on Al-induced increase in root surface pH.
In Larsen et al. (pp. 9-17) and Degenhardt et al. (pp. 19-27), a
detailed genetic and physiological analysis of these two types of
alr mutants is presented.
[Table of Contents]
Copyright © 2007 by the American Society of Plant Biologists
