Abstract
The main degradation products of lignin in the tea-plant stems and leaves are represented by vanillin, syringic aldehyde and syringic acid, along with many unidentified compounds absent in the degradation products of standard spruce lignin. In the stem lignin guaiacyl structures dominate (81.5%) and the leaf lignin is richer in syringyl structures (56.6%). Lignins of dark grown (heterotrophic) leaf- and stem-derived callus tissues consist of not only guaicyl and syringyl structures (vanillin, vanillic acid, syringic aldehyde, and syringic acid) but also of p-hydroxyphenyl structures ( p-hydroxybenzaldehyde and p-hydroxybenzoic acid). Lignins of light grown (photomixotrophic) callus tissues are represented by guaiacyl and syringyl structures (vanillin, and syringic acid) only. This means that tissue culture conditions contribute more to lignin composi tion than the origin of the callus tissue.
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