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Novel lignin is formed in a mutant loblolly pine (Pinus taeda L.) severely depleted in cinnamyl alcohol dehydrogenase (E.C. 1.1.1.195), which converts coniferaldehyde to coniferyl alcohol, the primary lignin precursor in pines. Dihydroconiferyl alcohol, a monomer not normally associated with the lignin biosynthetic pathway, is the major component of the mutant's lignin, accounting for approximately 30 percent (versus approximately 3 percent in normal pine) of the units. The level of aldehydes, including new 2-methoxybenzaldehydes, is also increased. The mutant pines grew normally indicating that, even within a species, extensive variations in lignin composition need not disrupt the essential functions of lignin.

Type

Journal article

Journal

Science

Publication Date

11/07/1997

Volume

277

Pages

235 - 239

Keywords

Non-programmatic, Alcohol Oxidoreductases, Aldehydes, Lignin, Magnetic Resonance Spectroscopy, Mutation, Oxidation-Reduction, Phenols, Pinus taeda, Plant Proteins