Abstract
The chemical composition of the pectin fraction of growing cells of two cereal grasses, maize and proso millet, was examined. Chelator-soluble pectin comprised less than 15 wt% of the cell wall. About one-third of this material was glucuronoarabinoxylan similar to that of the hemicellulose fraction, and about an equal amount was galacturonan and rhamnogalacturonan typical of dicot pectins. The rhamnosyl units were more highly branched than those typically found in dicots; side-chains were composed predominantly of (1→5)-linked arabinosyl and (1→4)-linked galactosyl units with numerous branches. A type II arabinogalactan containing (1→3)-, (1→6)-, and (1→3,1→6)-linked galactosyl units comprised the remainder of the pectic polysaccharides.
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