Studies On Micromorphological Characters Of Leave Of Lycoris Herb. In China

In the first, the research development and problems in the taxonomical systematics of Lycoris were summarized in the article, including the research of germplasma resources and exploitations, artificial cultivation, tissue culture, physiology, morphology, pharmacology, decorative values and molecule. The classification system among species of Lycoris was discussed through morphology, chromosome, molecule. The systematical relationship among 12 species of Lycoris has been discussed. The problems in the taxonomical systematics are as follows: (l)The results of cytology are different from that of molecule, but results of karyotype analycis and that of RAPD are same .So it is seem too hard to divide Lycoris two subgenus according to corolla regularity. (2)The views on systematical tree of those species of Lycoris which have fairly more hybrid body are different . (3)The research of Lycoris on the systematical relationship of micro-morphology and anatomy is absent. It is essential to generalize the character indexes of morphology, anatomy, cytology, palynology and molecular physiology. So We can establish classification system of Lycoris and draw a reasonable family tree of Lycoris. Based on the reseaching of Lycoris leaf micro-morphology characters by SEM scanning, light microscope viewing and using paraffin method in the article,we try to provide the proofs of experiment and the efffective characer indexes to discuss the system and evolution of the Lycoris.we find these microscopecharacers through reseach are as follows: the arrangement type ,density and the length of stoma; the shape and length of the epidermal cells; the ridge of epidermis; the transverse shape of leaf; the number of the vascular bundle ; the style of vessel arrangement of vascular bundle in the middle vein ; the layers of palisade tissue ; the ratio of the thicken of palisade tissue to that of spongy tissue ; the angle number of the middle leaf; the type of ventilating cavity etc. These characters are different from those of species in Lycoris, meanwhile these characters are similar to those of some species in Lycoris. So these characters can be used as the character indexes for differentiating species and reseaching systematic evolution of Lycoris; We can divide Lycoris into two subgenus by these characteristic indexes: the species of one subgenus are L. aurea (L' Her.) Herb,, chinensis Traub, L. caldweUii Traub, L. anhuiensis Y. Hsu et Q. J. Fan, L. longituba Y. Hsu et Q. J. Fan ; the species of another subgenus are L. houdyshelii Traub, L. albiflora Koidz., L. rosea Traub et Moldenke, L. straminea Lindl. Meanwhile, some characters of L. sprengeri Comes ex Baker and L. squamigera Maxim, are close to the genetic relationship among one subgenus and other characters are close to that among the another subgenus . Two species may be transitional taxa.