The maize Brown midrib1 locus affects cell wall composition and plant development in a dose-dependent manner View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2002-05-27

AUTHORS

W Vermerris, K J Thompson, L M Mcintyre

ABSTRACT

The four brown midrib (bm) mutants of maize have a reduced content and altered subunit composition of the cell wall polymer lignin. The bm mutations have traditionally been considered completely recessive, because the brown midribphenotype is only apparent in plants homozygous for the mutation. In addition to an effect on cell wall composition, some bm mutations have been shown to affect flowering time. We had preliminary evidence for a dosage effect of the Bm1 locus on flowering time, which prompted this detailed study on the Bm1 locus. In this study, near-isogenic lines (in an A619 background) with zero, one or two bm1 mutant alleles were compared. The bm1 heterozygotes flowered significantly earlier than both the wild-type plants and bm1 mutants. This difference can at least be partly attributed to an accelerated growth rate in the later stages of plant development. Furthermore, Fourier transform infrared spectroscopy revealed that the cell wall composition of the bm1 heterozygous plants is distinct from both the bm1 and wild-type homozygotes. The combination of the data on flowering time and the data on cell wall composition provide evidence for a dosage effect at the Bm1 locus. More... »

PAGES

450-457

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/sj.hdy.6800078

DOI

http://dx.doi.org/10.1038/sj.hdy.6800078

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1002081344

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/12180087


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