新疆“短命植物”独行菜营养器官的解剖学科研究

A ANATOMICAL STUDY ON THE EPHEMERAL PLANT-LEPIDUM APALUM WILLD IN XINJIANG

短命植物独行菜的结构特征为:根、茎、叶有大型及特大型薄壁细胞.根的次生木质部导管腔很大,在次生的薄壁细胞有黑芥子酶,栅栏组织特别发达,叶为等面叶.叶绿体体积小而数量非常多.在上、下表皮内方的栅栏组织之间夹有类似海绵组织的结构,这种特殊结构,在中生植物中极为罕见.其叶属于C_4植物型.

There are quite large aqueus cells in the root. Stem and leaf in the Lepidium apetalum willd. The secondary Xylem of root has a large vessel diameter. In the thin cels of secondary tissue, there is enzyme. The mesophyll has relatively better developed palisade tissue than common mesophyll. The leaves are isobilateral leaves. The mesophyll contains chloroplast small in size but large in mumber. It belongs to four-carbon plant. Between the mesophylls, there are something like spongy tissue, and this special structure is rare in the half-lived plants.