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Cell wall-bound trans- and cis-ferulic acids in growing maize roots
Authors:Roland Locher,Hilary V. Martin,René   Grison,Paul-Emile Pilet
Affiliation:Univ. of Lausanne, Institute of Plant Biology and Physiology, Biology Building, CH-1015 Lausanne, Switzerland
Abstract: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 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-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.
Keywords:Cell wall    cis-ferulic acid    differentiation    growth    HPLC    maize    root    trans-ferulic acid    Zea mays
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