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《Acta Botanica Boreali-occidentalia Sinica》 2003-07
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Studits on the morphogenesis of rhizome from seedling and the accumulation of dioscin of Dioscorea zingiberensis

CAO Yu fang 1,2 ,HU Zheng hai 1,* (1 Institute of Botany,Northwest University, Xi'an 710069,China;2 Laboratory of Botonical Research,Laiyang Agricultural College, Laiyang, Shandong 265200,China)  
Studies on the morphogenesis and development of rhizome from seedling and the accumulation of dioscin of Dioscorea zingiberensis C. H. Wright have been made in this article. After germination, the knot expands into spheroid whose diameter is about 1.5cm. The apical cone of embryo bud gives rise to 4 tubercles early or late, which develop into primordial meristems of buds respectively. The first bud develops into twining stem, and the others develop into rhizomes. Some of the primordial meristems form two buds, this leads the rhizome to form branches. The primordial meristem at the tip of rhizome is surrounded by lepises. There is primary thickening meristem at the lower part of rhizome tip under protoderm. The increase in cells number derived from primary thickening meristem and in cells volume make the rhizome thicken rapidly. Full developed rhizome is composed of periderm, ground tissue and vascular bundle.After histochemistry determination, it shows that dioscin take the form of liquid drop and exists mainly in the cells of parenchyma of ground tissue. The primordial meristem and the procambium strand do not contain dioscin and the xylem and the phloem fiber of the vascular bundle do not contain dioscin either, but the life cells of phloem and the cells of vascular bundle sheath accumulate dioscin. Dioscin does not take the form of liquid drop in ground meristem near the tip of rhizome, but liquid drop that contain dioscin is formed in the cells of ground tissue along with the cease of cell division. Dioscin that accumulated and distributed in ground tissue with small vascular bundle is the most abundant in the rhizome. The amount of dioscin of biennial is higher than that of annual rhizome.
【CateGory Index】: S567.2
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