Abstract
Agriculturally advantageous reduction in plant height is usually achieved by blocking the action or production of gibberellins. Here, we describe a different dwarfing mechanism found in maize brachytic2 (br2) mutants characterized by compact lower stalk internodes. The height reduction in these plants results from the loss of a P-glycoprotein that modulates polar auxin transport in the maize stalk. The sorghum ortholog of br2 is dwarf3 (dw3), an unstable mutant of long-standing commercial interest and concern. A direct duplication within the dw3 gene is responsible for its mutant nature and also for its instability, because it facilitates unequal crossing-over at the locus.
MeSH terms
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ATP Binding Cassette Transporter, Subfamily B / chemistry
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ATP Binding Cassette Transporter, Subfamily B / genetics*
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ATP Binding Cassette Transporter, Subfamily B / metabolism
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Alleles
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Amino Acid Sequence
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Base Sequence
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Biological Transport
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Cloning, Molecular
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Crossing Over, Genetic
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Gene Duplication
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Genes, Plant*
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Genes, Recessive
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Indoleacetic Acids / metabolism*
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Light
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Molecular Sequence Data
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Mutation
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Plant Proteins / chemistry
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Plant Proteins / genetics
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Plant Proteins / metabolism
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Plant Stems / cytology
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Plant Stems / metabolism
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Poaceae / cytology
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Poaceae / genetics
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Poaceae / growth & development
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Poaceae / metabolism*
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Recombination, Genetic
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Zea mays / cytology
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Zea mays / genetics
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Zea mays / growth & development
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Zea mays / metabolism*
Substances
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ATP Binding Cassette Transporter, Subfamily B
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Indoleacetic Acids
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Plant Proteins
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indoleacetic acid