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(American Journal of Botany. 2002;89:203-210.)
© 2002 Botanical Society of America, Inc.

Genetics and Molecular Biology

The maize mutant barren stalk1 is defective in axillary meristem development1

Matthew K. Ritter, Christopher M. Padilla and Robert J. Schmidt2

Section of Cell and Developmental Biology, Division of Biology, University of California at San Diego, 9500 Gilman Drive, La Jolla, California 92093-0116 USA

barren stalk1 is a recessive mutant of maize that has no tassel branches, spikelets, tillers, or ears. Here we present a detailed characterization of the ba1 mutant phenotype, including scanning electron microscopy of developing inflorescences, in situ hybridization analysis using a meristem marker, molecular mapping, and genetic analysis demonstrating an epistatic relationship between ba1 and teosinte branched1 (tb1). These data show that the primary defect in the ba1 mutant is a failure in axillary meristem development.

Key Words: axillary meristem • barren stalk1 • ba1 • inflorescence • maize • spikelet • tillers




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