红树植物导管数量多、管孔小、机械组织为韧型纤维，薄壁组织次生加厚明显是适应环境的特征。
Many vessel numbers, small pore, libriform fibres (mechanical tissue)and obvious secondary thickening of xylem tissue are the features of adaptation to the environment.
导管与纤维管胞均具明显的螺纹加厚。
Vessel and fibre - tracheid are both spiral thickening distinctly.
研究棉株生理年龄对棉纤维加厚发育及纤维比强度形成的影响。
Effects of physiological age of cotton plant on the physiological mechanism of fiber thickening development and fiber strength were studied.
不同部位的木质化的程度不同，原生木质部中只有轻微的加厚，而在厚壁组织和一些木质部导管中则进一步加厚，平均含25%-30%的木质素和50%的纤维素。
The degree of lignification varies from slight in protoxylem to heavy in sclerenchyma and some xylem vessels, but values of 25-30% lignin and 50% cellulose are average.
开花时，花药壁由表皮和几层薄壁细胞以及径向壁纤维加厚的变形细胞组成。
At anthesis, the mature anther wall included epidermis and some layers of parenchymal cells and several layers of endothecium cells with an evidently thickened radial wall.
开花时，花药壁由表皮和几层薄壁细胞以及径向壁纤维加厚的变形细胞组成。
At anthesis, the mature anther wall included epidermis and some layers of parenchymal cells and several layers of endothecium cells with an evidently thickened radial wall.
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