Research Article

Loss of an MDR Transporter in Compact Stalks of Maize br2 and Sorghum dw3 Mutants

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Science  03 Oct 2003:
Vol. 302, Issue 5642, pp. 81-84
DOI: 10.1126/science.1086072

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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.

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