Abstract
Grasses are a predominant source of nutritional energy for livestock systems around the world. Grasses with high lignin content have lower energy conversion efficiencies for production of bioenergy either in the form of ethanol or to milk and meat through ruminants. Grass lignins are uniquely acylated with p-coumarates (pCA), resulting from the incorporation of monolignol p-coumarate conjugates into the growing lignin polymer within the cell wall matrix. The required acyl-transferase is a soluble enzyme (p-coumaroyl transferase, pCAT) that utilizes p-coumaroyl-CoenzymeA (pCA-CoA) as the activated donor molecule and sinapyl alcohol as the preferred acceptor molecule. Grasses (C3and C4) were evaluated for cell wall characteristics; pCA, lignin, pCAT activity, and neutral sugar composition. All C3 and C4 grasses had measurable pCAT activity, however the pCAT activities did not follow the same pattern as the pCA incorporation into lignin as expected.
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Abbreviations
- CW:
-
Cell wall
- pCA:
-
p-Coumarates
- FA:
-
Ferulates
- S:
-
Syringyl
- G:
-
Guaiacyl
- CA-pCA:
-
Coniferyl p-coumarate
- SA-pCA:
-
Sinapyl p-coumarate
- pCAT:
-
p-Coumaroyl transferase
- dHSA:
-
Dihydrosinapyl alcohol
- dHCA:
-
Dihydroconiferyl alcohol
- EtOH:
-
Ethanol
- MeOH:
-
Methanol
- TFA:
-
Trifluoroacetic acid
- Tris:
-
2-Amino-2-(hydroxymethyl)-1,3-propanediol
- MOPS:
-
4-Morpholinepropanesulfonicacid
- GLC–FID:
-
Gas liquid chromatography–flame ionization detection
- Glc:
-
Glucose
- Xyl:
-
Xylose
- Ara:
-
Arabinose
- GAX:
-
Glucuronoarabinoxylans
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Acknowledgments
This work was supported with funding from NRI-CGP (Plant Biochemistry Section—Grant No. 2004-03034) and was partially funded by Monsanto Company (CRADA No. 58-3K95-2-938) and ArborGen, LLC (CRADA No. 58-3K95-8-598). Mention of a trademark or proprietary product does not constitute a guarantee or warranty of product by the USDA and does not imply its approval to the exclusion of other products that may also be suitable. A special thanks to Lindsay Stafslien for her dedication and help in processing the samples.
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Hatfield, R.D., Marita, J.M., Frost, K. et al. Grass lignin acylation: p-coumaroyl transferase activity and cell wall characteristics of C3 and C4 grasses. Planta 229, 1253–1267 (2009). https://doi.org/10.1007/s00425-009-0900-z
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DOI: https://doi.org/10.1007/s00425-009-0900-z