Abstract
Suberin is a lipid-phenolic biopolymer present in the cell walls of specialized plant cell types. Due to its insolubility and impermeability, suberin forms an important barrier to the transport of water, ions and gases in certain plant tissues, such as the root endodermis, the periderm and the bundle sheath of C4 plants. In sugarcane forage, supplied in tropical countries as complement to animal livestock, the cell walls of most tissues that build up the stem are progressively suberized. Suberin biochemical features and significant content in the stem make this biopolymer an extra factor influencing sugarcane biomass recalcitrance, decreasing digestibility. Here, we summarize the latest data on the biosynthesis, transport and deposition of suberin in plants, with a special focus on sugarcane forage, and discuss how this biopolymer affects biomass digestibility.
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Abbreviations
- ASFT:
-
Aliphatic suberin feruloyl transferase
- C4H:
-
cinnamate 4-hydroxylase
- CoA:
-
Coenzyme A
- COMT:
-
Caffeic acid O-methyltransferase
- CYP:
-
Cytochrome P450 monooxygenase
- DM:
-
Dry matter
- FAR:
-
Fatty acyl-CoA reductase
- FACT:
-
Fatty alcohol:caffeoyl-CoA transferase
- FTIR:
-
Fourier transform infrared
- F5H:
-
Ferulate 5-hydroxylase
- GPAT:
-
Glycerol-3-phosphate acyltransferase
- G:
-
Guaiacyl
- H:
-
p-hydroxyphenyl
- IVDMD:
-
in vitro dry matter disappearance ()
- KCS:
-
β-ketoacetyl-CoA synthase
- PAL:
-
Phenylalanine ammonia-lyase
- NADP-ME:
-
NADP-malic enzyme
- NDF:
-
Neutral detergent fiber
- S:
-
Syringyl
- TEM:
-
Transmission electron microscopy
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Acknowledgments
RF would like to thank the Foundation for Research of the State of São Paulo for a post-doctoral fellowship (Fapesp grant 2015/05437-3); IC would like to thank FAPESP for the Young Investigators Awards research fellowship (grant 2015/02527-1); and PM would like to thank the National Council of Scientific and Technological Development (CNPq – Brazil) for a research fellowship. Marvin was used for drawing the chemical structures shown in Fig. 1, Marvin 15.3.30 (version number), 2015, ChemAxon (http://www.chemaxon.com). The authors would like to thank the Writing Department – University General Coordinator – UNICAMP – for the language services provided.
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Communicated by: Paulo Arruda
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Figueiredo, R., Cesarino, I. & Mazzafera, P. Suberin as an Extra Barrier to Grass Digestibility: a Closer Look to Sugarcane Forage. Tropical Plant Biol. 9, 96–108 (2016). https://doi.org/10.1007/s12042-016-9166-3
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DOI: https://doi.org/10.1007/s12042-016-9166-3