Structural and compositional modifications in lignin of transgenic alfalfa down-regulated in caffeic acid 3-O-methyltransferase and caffeoyl coenzyme A 3-O-methyltransferase

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Article on the structural and compositional modifications in lignin of transgenic alfalfa down-regulated in caffeic acid 3-O-methyltransferase and caffeoyl coenzyme A 3-O-methyltransferase.

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13 p.

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Marita, Jane M.; Ralph, John; Hatfield, Ronald D.; Guo, Dianjing; Chen, Fang & Dixon, R. A. August 28, 2002.

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Article on the structural and compositional modifications in lignin of transgenic alfalfa down-regulated in caffeic acid 3-O-methyltransferase and caffeoyl coenzyme A 3-O-methyltransferase.

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13 p.

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Abstract: Isolated lignins from alfalfa deficient in caffeic acid 3-O-methyltransferase contained benzodioxanes resulting from the incorporation of the novel monomer, 5-hydroxyconiferyl alcohol. Due to the high level incorporated into the soluble lignin fraction and the use of sensitive NMR instrumentation, unique structural features were revealed. A new type of end-unit, the 5-hydroxyguaiacyl glycerol unit, was identified. It was possible to establish that coniferyl alcohol, sinapyl alcohol, and the novel 5-hydroxyconiferyl alcohol can cross-couple with the 5-hydroxyguaiacyl units that are formed in the lignin, the latter giving rise to extended chains of benzodioxane units. There is also evidence that 5-hydroxyconiferyl alcohol couples with normal (guaiacyl or syringyl) lignin units. Lignin in the alfalfa deficient in caffeoyl CoA 3-O-methyltransferase was structurally similar to the control lignin but the transgenic exhibited a dramatic decrease in lignin content (approximately 20%) and modest increase in cellulose (approximately 10%) reflecting a 30% increase in cellulose:lignin ratio. The compositional changes in both transgenics potentially allow enhanced utilization of alfalfa as a major forage crop by increasing the digestibility of its stem fraction.

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Copyright © 2003 Elsevier Science Ltd., all rights reserved. http://www.sciencedirect.com/science/article/pii/S003194220200434X

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  • Phytochemistry, 2003, New York: Elsevier Science Ltd., pp. 53-65

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  • Publication Title: Phytochemistry
  • Volume: 62
  • Issue: 1
  • Page Start: 53
  • Page End: 65
  • Pages: 13
  • Peer Reviewed: Yes

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  • July 8, 2002

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  • August 28, 2002

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  • August 28, 2002

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  • Jan. 22, 2015, 9:04 a.m.

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  • April 1, 2015, 3:31 p.m.

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Marita, Jane M.; Ralph, John; Hatfield, Ronald D.; Guo, Dianjing; Chen, Fang & Dixon, R. A. Structural and compositional modifications in lignin of transgenic alfalfa down-regulated in caffeic acid 3-O-methyltransferase and caffeoyl coenzyme A 3-O-methyltransferase, article, August 28, 2002; [New York, New York]. (digital.library.unt.edu/ark:/67531/metadc488183/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.