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Lignin Down-regulation of Zea mays via dsRNAi and Klason Lignin Analysis

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Model studies of ferulate-coniferyl alcohol cross-product formation in primary maize walls: implications for

John H Grabber¹, John Ralph, Ronald D Hatfield

¹U.S. Dairy Forage Research Center, Agricultural Research Service, U.S. Department of Agriculture, 1925 Linden Drive West, Madison, Wisconsin 53706, USA. jgrabber@facstaff.wisc.edu

Journal of Agricultural and Food Chemistry

|October 3, 2002

Summary

This summary is machine-generated.

Ferulate and diferulate compounds are key in grass cell walls. They copolymerize with coniferyl alcohol, influencing lignin formation and acting as nucleation sites during early lignification.

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Area of Science:

Plant Biology
Biochemistry
Biomaterials Science

Background:

Ferulate and diferulates are crucial for cell wall cross-linking in grasses.
Their specific roles in monolignol cross-coupling and primary cell wall lignin formation are not well understood.

Purpose of the Study:

To investigate the cross-coupling reactions between ferulates, diferulates, and monolignols.
To elucidate the role of these compounds in the initial stages of lignin formation in maize primary cell walls.

Main Methods:

Artificial lignification of feruloylated maize primary walls.
Saponification to release cross-products.
Analysis using Gas Chromatography-Flame Ionization Detection (GC-FID), Gas Chromatography-Mass Spectrometry (GC-MS), and Nuclear Magnetic Resonance (NMR) spectroscopy.

Main Results:

Ferulate and 5-5-coupled diferulate showed higher copolymerization with coniferyl alcohol than 8-coupled diferulates.
Predominant cross-coupled structures formed were 4-O-beta' and 8-beta', with some 8-O-4' and 8-5'.
Initially de-esterified 8-beta' xylan cross-links were replaced by stable 8-coupled diferulate-lignin structures.

Conclusions:

Ferulate and diferulate cross-products with coniferyl alcohol are integral to early lignin polymerization.
These cross-products serve as nucleation sites, initiating lignin formation in primary cell walls.