Abstract
The lignification process and lignin heterogeneity of fibre, vessel and parenchyma cell walls for various age classes of bamboo stems of Phyllostachys pubescens Mazel were investigated. It was shown that protoxylem vessels lignified in the early stage of vascular bundle differentiation, metaxylem vessel and fibre walls initiated lignification from the middle lamella and cell corners after the completion of vascular bundle differentiation. Most of the parenchyma cell walls lignified after the stem reached its full height, while a few parenchyma cells remained non-lignified even in the mature culm. The cell walls of fibres and most parenchyma cells thickened further during the stem growth to form polylamellate structure and the lignification process of these cells may last even up to 7 years. The fibre walls were rich in guaiacyl lignin in the early stage of lignification, and lignin rich in syringyl units were deposited in the later stage. Vessel walls mainly contained guaiacyl lignin, while both guaiacyl and syringyl lignin were present in the fibre and parenchyma cell walls.
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