初级细胞壁(primary cell walls)和次级细胞壁(secondary cell walls) 答：初级细胞壁与次级细胞壁这两种细胞壁表明了细胞的不同成熟阶段。
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Pectin is the most complicated polysaccharides in all plant primary cell walls. It has good gel forming and emulsion ability.
果胶类多糖是植物细胞壁多糖类家族中结构最为复杂的一种，具有优良的胶凝性和乳化性及多种生理功效。
POD was mainly distributed in the radial walls of the cambial cells and expanding xylem cell, especially at the corner of cell wall and cell wall close to the primary pit field.
形成层细胞阶段和伸展生长阶段，POD主要分布在径壁上，尤其是细胞壁角隅处和初生纹孔场附近的细胞壁。
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