Lignin remains one of the most significant barriers to the efficient utilization of cellulosic substrates. Up- and down-regulating genes for enzymes in the monolignol biosynthetic pathway can produce at times striking alterations in lignin composition and structure that may positively or negatively impact a given processes. A few approaches hold considerable promise for reducing the severity and energy demands of various processes. We are gaining insight into what features are required by ideal lignin monomers and are beginning explorations into possible lignin monomer replacements. And now that monomer substitution in the lignification process is well authenticated in various transgenic plants, we are beginning to actually design lignins to improve the ease with which they can be removed from the cell wall. Here we highlight recent progress in the use of monolignol conjugates that have the potential to vastly reduce the energy demands of processing.

Altering plant lignins for improved processing

245th National Meeting (2013)

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