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THE PLANT CELL, Vol 3, Issue 8 801-807, Copyright © 1991 by American Society of Plant Biologists
Sectors of liguleless-1 Tissue Interrupt an Inductive Signal during Maize Leaf Development
P. W. Becraft and M. Freeling
Plant Biology Department, University of California, Berkeley, California 94720
The ligule and auricles separate the blade and sheath of normal maize
leaves and are absent in liguleless-1 (lg1) mutant leaves. We induced
chromosome breakage using X-rays to create plants genetically mosaic for
lg1. In genetically mosaic leaves, when an lg1 mutant sector interrupts the
normal ligule, the ligule is often displaced basipetally on the marginal
side of the sector. Therefore, lg1 mutant sectors not only fail to induce
ligule and auricle, but are also disrupting some form of intercellular
communication that is necessary for the normally coordinated development of
the ligular region. Our data are consistent with a model in which an
inductive signal originates near the midvein, cannot traverse the lg1
mutant sector, and reinitiates in the wild-type tissue across the sector
toward the leaf margin. The lg1 gene product, therefore, appears to be
required for the transmission of this signal and could be involved with
reception.
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