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- W1489206827 abstract "The brown-midrib-1 (bm1) mutant of maize produces a lignin which differs in several important respects from the lignin of normal plants. First, the color of alkali lignin or lignin in situ of the bm1 mutant is red-brown as opposed to a grey-tan for normal plants. Alkaline hydrolysis of native lignin, dioxane-hydrochloric acid lignin, pyridine lignin, or lignin in situ shows that the bm1 lignin has considerably less p-hydroxycinnamic acid bound by ester linkages to the lignin “core.” Nitrobenzene oxidation of the bm1 lignin “core” shows a lower recovery of phenolic monomers with a larger amount of residue resistant to nitrobenzene oxidation. The phenolic monomers, however, are obtained in approximately the same ratio from both normal and mutant alkali lignin and lignin in situ. The mutant plants have a lower lignin content throughout growth and at maturity have 86% as much lignin as normal plants. Further, the methoxyl content of alkali lignins from the stalk of normal and bm1 strains is 14.6 and 12.3%, respectively. Tracer experiments with uniformly labeled phenylalanine-C14 and tyrosine-C14 show that radioactivity from these precursors is incorporated more rapidly into the alkali lignin fraction of normal plants than into the same fraction of brown-midrib plants. It is suggested that the primary action of the non-mutant (Bm1) gene at the bm1 locus is to exert a measure of control over the manner of incorporation of the phenolic building blocks into the lignin polymer. When the mutant (bm1) gene is present, the lignin “core” has fewer sites at which p-hydroxycinnamic acid can be esterified." @default.
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- W1489206827 date "1964-04-01" @default.
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- W1489206827 title "The abnormal lignins produced by the brown-midrib mutants of maize" @default.
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- W1489206827 doi "https://doi.org/10.1016/0003-9861(64)90240-1" @default.
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