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E. 1994. Cell wall-bound trans-and cis-ferulic acids in growing maize roots -Physiol. Plant. 90; 734-738.The levels of ceil wall-bound trans-and ci's-ferulic acids in roots of dark grown Zea mays cv.LGl 1 plants were measured. They were quantified after alkaline hydrolysis of purified cell walls by reversed phase HPLC using fran.!-cinnamic acid as internal standard. The total amount of ferulic acid (trans-and cH-feruilc acid) in the root ba.se was 3-4 times higher than in the root tip. Cu-ferulic acid represented between 2% (tip) and 18% (base) of the total ferulic acid content. The total content of trans-and f is-femlic acids was approximately the same in the stele and the cortex, but the level of CK-ferulic acid in the stele was 5-6 times higher than in the cortex. Trans-and cK-ferulic acid levels as well as the percentage of cis-ferulic acid in the elongation zone were steady between 48 and 96 h after the beginning of germination. Slowly growing roots contained more wall-hound ferulic acids, particularly m-femlic acid, than fast growing roots. This relationship was found in the differentiation zone but not in the elongation zone. The importance of cell wall-bound trans-and ci.s-ferulic acids is discussed in the context of root growth and differentiation.

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