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Molecular genetic basis of pod corn (Tunicate maize).

ABSTRACT: Pod corn is a classic morphological mutant of maize in which the mature kernels of the cob are covered by glumes, in contrast to generally grown maize varieties in which kernels are naked. Pod corn, known since pre-Columbian times, is the result of a dominant gain-of-function mutation at the Tunicate (Tu) locus. Some classic articles of 20th century maize genetics reported that the mutant Tu locus is complex, but molecular details remained elusive. Here, we show that pod corn is caused by a cis-regulatory mutation and duplication of the ZMM19 MADS-box gene. Although the WT locus contains a single-copy gene that is expressed in vegetative organs only, mutation and duplication of ZMM19 in Tu lead to ectopic expression of the gene in the inflorescences, thus conferring vegetative traits to reproductive organs.

SUBMITTER: Wingen LU

PROVIDER: S-EPMC3344968 | biostudies-literature | 2012 May

REPOSITORIES: biostudies-literature

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Molecular genetic basis of pod corn (Tunicate maize).

Wingen Luzie U LU Münster Thomas T Faigl Wolfram W Deleu Wim W Sommer Hans H Saedler Heinz H Theißen Günter G

Proceedings of the National Academy of Sciences of the United States of America 20120418 18

Pod corn is a classic morphological mutant of maize in which the mature kernels of the cob are covered by glumes, in contrast to generally grown maize varieties in which kernels are naked. Pod corn, known since pre-Columbian times, is the result of a dominant gain-of-function mutation at the Tunicate (Tu) locus. Some classic articles of 20th century maize genetics reported that the mutant Tu locus is complex, but molecular details remained elusive. Here, we show that pod corn is caused by a cis- ...[more]

PMID: 22517751

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