双穗雀稗(Paspalum distichum)通透性生理和茎解剖结构补充研究

双穗雀稗根外皮层，茎角质层和茎节中的质外体屏障结构阻挡黄连素示踪液透过植物体。茎中机械组织包括周缘厚壁机械组织层，厚壁组织层和维管系统，髓部和皮层的蜂窝状厚角组织。茎中通气组织包括茎节间髓部和皮层的蜂窝状通气组织，茎节内的通气组织。双穗雀稗茎节间具有外侧、内侧和维管系统的质外体屏障，以及茎节周围质外体屏障的封闭结构。因此，该植物体完善的机械组织、通气组织、质外体屏障结构及其离子不通透性是其适应湿地环境的重要结构。

Permeability and Supplement Structures of Stems of Paspalum distichum

The permeability of knotgrass (Paspalum distichum) experiment results showed the exodermis, cuticle and apoplastic barriers in nodes blocked the berberine tracer. The mechanical tissue in stems included the peripheral mechanical ring, sclerenchyma ring, vascular tissue system, and the honeycomb-like collenchyma in the pith and cortex. Air space in stems consisted of honeycomb in the pith and cortex, and aerenchyma in the nodes. The apoplastic barriers included in the inner, outer and vascular tissue system on the internodes, and around the nodes are prevented structures. Overall, the perfect mechanical tissue, air space, apoplastic barriers and its blocked property are the key structures of knotgrass adapted to wetland environment.