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

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.

Key Words: Acid detergent lignin (ADL) • Acid detergent fiber (ADF) • Cell wall constituents (CWC) • Plant parts

² Assistant Professor of Animal Science, Purdue University; Research Agronomist, Plant Science Research Division, Agricultural Research Service, U.S. Department of Agriculture, U.S. Regional Pasture Research Laboratory, University Park, Pa. 16802 (formerly at Lafayette, Indiana); Professor of Agronomy; and Associate Professor of Animal Science. Purdue University, Lafayette, Ind. 47907.

Received for publication November 6, 1970.

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