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THE PLANT CELL, Vol 7, Issue 4 407-416, Copyright © 1995 by American Society of Plant Biologists

RESEARCH ARTICLES

The brown midrib3 (bm3) Mutation in Maize Occurs in the Gene Encoding Caffeic Acid O-Methyltransferase

F. Vignols, J. Rigau, M. A. Torres, M. Capellades and P. Puigdomenech
Departament de Genetica Molecular, Centro de Investigacion y Desarrollo, Consejo Superior de Investigaciones Cientificas, Jordi Girona 18, 08034 Barcelona, Spain

The brown midrib mutations are among the earliest described in maize. Plants containing a brown midrib mutation exhibit a reddish brown pigmentation of the leaf midrib starting when there are four to six leaves. These mutations are known to alter lignin composition and digestibility of plants and therefore constitute prime candidates in the breeding of silage maize. Here, we show that two independent brown midrib3 (bm3) mutations have resulted from structural changes in the COMT gene, which encodes the enzyme O-methyltransferase (COMT; EC 2.1.1.6), involved in lignin biosynthesis. Our results indicate that the bm3-1 allele (the reference mutant allele) has arisen from an insertional event producing a COMT mRNA altered in both size and amount. By sequencing a COMT cDNA clone obtained from bm3-1 maize, a retro-transposon with homology to the B5 element has been found to be inserted near the junction of the 3[prime] coding region of the COMT gene intron. The second bm3 allele, bm3-2, has resulted from a deletion of part of the COMT gene. These alterations of the COMT gene were confirmed by DNA gel blot and polymerase chain reaction amplification analyses. These results clearly demonstrate that mutations at the COMT gene give a brown midrib3 phenotype. Thus, the gene genetically recognized as bm3 is the same as the one coding for COMT.


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