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This article in CS

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


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doi:10.2135/cropsci1971.0011183X001100030030x

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

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

Abstract

Abstract

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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