六种苋属外来植物幼苗的显微结构特征比较

Comparison of Microstructure Traits of Seedlings of 6 Amaranthus Alien Plants

以苋属的6种外来植物,即绿穗苋(Amaranthus hybridus L.)、凹头苋(A.lividus L.)、长芒苋(A.palmeri S.Watson)、反枝苋(A.retroflexus L.)、刺苋(A.spinosus L.)、皱果苋(A.viridis L.)的三叶一心期幼苗为材料,通过表皮撕片法和木质部导管离析法,对6种苋属植物第一片真叶的叶表皮显微结构特征和叶脉导管特征进行了研究.结果表明,苋属6个外来植物幼叶的表皮细胞周长、面积、密度及导管宽度方面均存在显著差异,其中单位面积内的表皮细胞密度在不同种之间的差异性最大.上述研究预示着在不同苋属植物种间鉴别时,可以将叶表皮细胞显微结构特征和叶脉导管特征作为参考依据.

The seedlings at the three-leaf-one-apical stage were taken as materials to study the microstructure Traits of six alien plants of the genus Amaranthus,namely A.hybridus L.,A.lividus L.,A.palmeri S.Watson,A.retroflexus L.,A.spinosus L.,and A.viridis L.The cell traits of the leaf epidermis and xylem vessels of main veins for the first leaf of the seedlings were compared by peeling the epidermis and segregating the vascular bundles.The results showed that there were significant differences in the perimeter,area,and density of leaf epidermal cells and vessel widths of leaf vein in six alien plants’seedlings of Amaranthus plants,and that the cell density per unit area had the most significant difference among 6 alien plants.The present research indicated that the microstructure Traits of leaf epidermis cells and leaf vein vessels could be used as the reference indicators for distinguishing different Amaranthus plants.