Cell wall-bound trans- and cis-ferulic acids in growing maize roots
1994
Locher, R. | Martin, H.V. | Grison, R. | Pilet, P.-E. (Lausanne Univ. (Switzerland))
The levels of cell wall-bound trans- and cis-ferulic acids in roots of dark grown Zea mays cv. LG11 plants were measured. They were quantified after alkaline hydrolysis of purified cell walls by reversed phase HPLC using trans-cinnamic acid as internal standard. The total amount of ferulic acid (trans-and cis-ferulic acid) in the root base was 3-4 times higher than in the root tip. Cis-ferulic acid represented between 2% (tip) and 18% (base) of the total ferulic acid content. The total content of trans-and cis-ferulic acids was approximately the same in the stele and the cortex, but the level of cis-ferulic acid in the stele was 5-6 times higher than in the cortex. Trans-and cis-ferulic acid Ievels 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-bound ferulic acids, particularly cis-ferulic 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 cis-ferulic acids is discussed in the context of root growth and differentiation
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