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THE PLANT CELL, Vol 9, Issue 12 2159-2170, Copyright © 1997 by American Society of Plant Biologists
Disruption of Interfascicular Fiber Differentiation in an Arabidopsis Mutant
R. Zhong, J. J. Taylor and Z. H. Ye
Department of Botany, University of Georgia, Athens, Georgia 30602
Arabidopsis develops interfascicular fibers in stems for needed support of
shoots. To study the molecular mechanisms controlling fiber
differentiation, we isolated an interfascicular fiber mutant (ifl1) by
screening ethyl methanesulfonate-mutagenized Arabidopsis populations. This
mutant lacks normal interfascicular fibers in stems. Interestingly, some
interfascicular cells were sclerified in the upper parts but not in the
basal parts of the ifl1 stems. These sclerified cells were differentiated
at a position different from that of interfascicular fibers in the wild
type. Lack of interfascicular fibers correlated with a dramatic change of
stem strength. Stems of the mutant could not stand erect and were easily
broken by bending. Quantitative measurement showed that it took
approximately six times less force to break basal stems of the mutant than
of the wild type. In addition, noticeable morphological changes were
asssociated with the mutant, including long stems, dark green leaves with
delayed senescence, and reduced numbers of cauline leaves and branches.
Genetic analysis showed that the ifl1 mutation was monogenic and recessive.
The ifl1 locus was mapped to a region between the 17C2 and 7H9L markers on
chromosome 5. Isolation of the ifl1 mutant provides a novel means to study
the genetic control of fiber differentiation.
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