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Crop Science Abstract -

Variations in Lignin and Other Structural Components of Brown Midrib Mutants of Maize1


This article in CS

  1. Vol. 11 No. 3, p. 413-415
    Received: Nov 6, 1970

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  1. L. D. Muller,
  2. R. F. Barnes,
  3. L. F. Bauman and
  4. V. F. Colenbrander2



Three brown midrib (mutant) genotypes of maize (Zea mays L.) in inbred Tr background, bm1, bm3, and bm1/bm3 were harvested at 10, 35, and 55 days post-silking and compared to the normal inbred line, Tr. Plants were separated into leaf blade, leaf sheath, stem, and a composite of husk, kernel, cob, and tassel tissue. Structural and nonstructural constituents were determined for component parts, and a weighted mean was obtained for the whole plant. Acid detergent lignin (ADL) values of the whole plant for normal, bm1, bm3, and bm1/bm3 were 6.08, 5.13, 4.37, and 4.60%, respectively, for plants harvested 35 days post-silking. The leaf blade, stem, and leaf sheath tissue of the three brown midrib genotypes contained lower ADL (P < .05) than the normal maize. Similar differences existed at 10 and 55 days post-silking. The brown midrib genotypes, bm3 and bm1/bm3, were consistently lower in ADL than was bm1 over harvests and plant parts. Other structural and nonstructural constituents measured were variable. The normal counterpart had higher ADL/acid-detergent fiber (ADF) and ADL/cellulose ratios than the three brown midrib genotypes for leaf blade, stem, and leaf sheath tissue.

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