马来良姜花柱卷曲运动的结构基础

Structural Fundamentals of Style Curvature in Flexistylous Alpinia mutica

山姜属(Alpinia L.)植物的花柱具卷曲运动的能力,该属植物的野生种群有两种表型的个体,其花柱运动方向相反。该文通过观察马来良姜(Alpinia mutica Roxb.)花柱的显微和超微结构来研究花柱卷曲运动的结构基础。结果表明两种表型的花柱解剖结构相同。花柱仅形态学上端区域(约占花柱总长度的25%)有卷曲运动能力,其它区域不能运动。运动区近轴侧分布着几层直径较大、形状不规则、相对较短且细胞壁较薄的细胞,远轴侧的细胞直径较小、狭长;非运动区近轴和远轴侧的细胞都呈狭长形。花柱运动区域近轴侧和远轴侧细胞结构和细胞层数的不对称可能是导致花柱卷曲运动的结构原因。

The styles of Alpinia have the ability to curve.The natural population of this genus has two morphs,the styles of which move towards opposite directions.We researched the structural fundamentals of the style curvature by micrography and electron ultramicrography.The anatomy of the two morphs was the same.The apical part(about 25% of total length) can curve,and other part cannot.The abaxial side of the curvature part had long and narrow cells.The adaxial side,besides containing these cells,also contained some cells with larger diameter,irregular shape,short length and thin cell wall.The cell type in the two sides of the non-curvature part was similar:long and narrow.The differences in cell structure and magnitudes of cell layers between adaxial and abaxial sides may be the structural fundamentals of style curvature.