Study On Biology Of Boschniakia Rossica

Detail biological studies of Boschniakia rossica using normal paraffin and electron microscopy methods have been presented in this paper。 The main content of this abservation is investigation of entironment of Boschniakia rossica,studies on morphology and anatomy of vegetative organs,and studies on the reproductive biology. The main results are as follows:1 Boschniakia rossica is one of parasitic plants by root and its structure is very simple. Boschniakia rossica has no chlorophyll. The alimentation is absorbed by haustellum from the side root of the host. Its anthotaxy is spica, and amphimixis flowers is serried inserted on the thick rachis. There are four androeciums in a flower, the anther is near sphericity and and roeciums protrude after florescence.2. Mature anther has four clinandrium and the development of anther wall follows the dicotyledon type. Tapetum is the secretory type. The microspore mother cell undergoes meiosis before it turns into microapore tetrad. Its cytokinesis belongs to simultaneous type,and microspore tetrads are often differ from tetrahedral to eudipleural,and the tetrahedral is the most.The mature pollen grains are two-celled。There are three shallow channels on the surface of mature pollens.3. Gynoecia is consist of two carpels, monolovary. There are many ovnles in a ovary, the ovnle is anatropous and tenuinucallate,and the megaspore archesporial cell under epidermis acts as the megasporocyte. After meiosis, the megasporocyte divides into linear megaspore tetrad. Under most circumstances, three of the megaspores degenerate. Only one of them can be reserved and turned into the functional magaspore. Finally, it develops into eight-nucleus mature embryo sac. It belongs to the polygonum type.4. Porogamy, the fertilization of polay nuleus(secondary nuleus) is earlier than that of the egg cell. The growth of embryo is cell-type ；the endosperm is cellular type and there are haustellum of endosperm.The embryo is remains as a globose embryo.