More than 40 monogenic dwarfing mutants have been described in maize; however, the majority of these lead to great reductions in grain yield and, consequently, they have not been used to enhance crop yield in germplasm that is sensible to lodging. An exception in terms of commercial value is the maize mutant brachytic 2 (br2). Br2 gene was cloned in 2003, and it encodes for a protein most probably involved in auxin polar transport. We have isolated a new brachytic mutation that is allelic to the br2 locus and denoted this novel mutant as br2–23. Characterization of this mutant revealed that the br2 mutation modified not only the length of the internodes, as previously reported, but the structure of the leaves as well. Br2–23/br2–23 heterozygotes have a useful intermediate phenotype in terms of plant height, ear height and leaf angle, suggesting a possible utilization of this effect in developing new hybrids. This mutant also appears to be an useful tool by which to study the switch points of the complex developmental program determining maize plant height and architecture.

Isolation and characterization of a new mutant allele of brachytic 2 maize gene / S.R. Pilu, E. Cassani, D. Villa, S. Curiale, D. Panzeri, F. Cerino Badone, M.V. Landoni. - In: MOLECULAR BREEDING. - ISSN 1380-3743. - 20:2(2007 Sep), pp. 83-91.

Isolation and characterization of a new mutant allele of brachytic 2 maize gene

S.R. Pilu
Primo
;
E. Cassani
Secondo
;
D. Villa;S. Curiale;D. Panzeri;M.V. Landoni
Ultimo
2007

Abstract

More than 40 monogenic dwarfing mutants have been described in maize; however, the majority of these lead to great reductions in grain yield and, consequently, they have not been used to enhance crop yield in germplasm that is sensible to lodging. An exception in terms of commercial value is the maize mutant brachytic 2 (br2). Br2 gene was cloned in 2003, and it encodes for a protein most probably involved in auxin polar transport. We have isolated a new brachytic mutation that is allelic to the br2 locus and denoted this novel mutant as br2–23. Characterization of this mutant revealed that the br2 mutation modified not only the length of the internodes, as previously reported, but the structure of the leaves as well. Br2–23/br2–23 heterozygotes have a useful intermediate phenotype in terms of plant height, ear height and leaf angle, suggesting a possible utilization of this effect in developing new hybrids. This mutant also appears to be an useful tool by which to study the switch points of the complex developmental program determining maize plant height and architecture.
Auxin polar transport; Brachytic 2 gene; Leaf angle; Maize; Mutant; PCR based molecular marker
Settore AGR/07 - Genetica Agraria
set-2007
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/50086
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