Targeted down-regulation of cytochrome P450 enzymes for forage quality improvement in alfalfa (Medicago sativa L.)

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Article on targeted down-regulation of cytochrome P450 enzymes for forage quality improvement in alfalfa (Medicago sativa L.).

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6 p. : col. ill.

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Reddy, M. S. Srinivasa; Chen, Fang; Shadle, Gail L.; Jackson, Lisa A.; Aljoe, Hugh & Dixon, R. A. November 15, 2005.

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Article on targeted down-regulation of cytochrome P450 enzymes for forage quality improvement in alfalfa (Medicago sativa L.).

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6 p. : col. ill.

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Abstract: Improving the digestibility of forages provides a means to enhance animal performance and protect the environment against excessive animal waste. Increased lignin content during maturity, and corresponding changes in lignin composition, correlate with decreased digestibility of forages. These relationships have yet to be investigated in isogenic systems. By targeting three specific cytochrome P450 enzymes of the lignin pathway for antisense down-regulation, we generated transgenic alfalfa lines with a range of differences in lignin content and composition. There was a strong negative relationship between lignin content and rumen digestibility, but no relationship between lignin composition and digestibility, in these transgenic lines. Models for genetic manipulation of forage digestibility based on the changes in lignin composition that increase paper-pulping efficiency in trees are therefore invalid. Down-regulation of 4-coumarate 3-hydroxylase provided the largest improvements in digestibility yet seen in a forage crop.

© 2005 by The National Academy of Sciences of the USA.

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  • Proceedings of the National Academy of Sciences (U.S.), 2005, Washington D.C.: National Academy of Sciences (U.S.), pp. 16573-16578

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  • Publication Title: Proceedings of the National Academy of Sciences (U.S.)
  • Volume: 102
  • Issue: 46
  • Page Start: 16573
  • Page End: 16578
  • Pages: 6
  • Peer Reviewed: Yes

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  • November 15, 2005

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  • Jan. 22, 2015, 9:04 a.m.

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Reddy, M. S. Srinivasa; Chen, Fang; Shadle, Gail L.; Jackson, Lisa A.; Aljoe, Hugh & Dixon, R. A. Targeted down-regulation of cytochrome P450 enzymes for forage quality improvement in alfalfa (Medicago sativa L.), article, November 15, 2005; [Washington, D.C.]. (digital.library.unt.edu/ark:/67531/metadc488171/: accessed November 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.