The Form,Structure and Element Component of Mycorrhizas in Dendrobium spp.

The Mycorrhizas in Dendrobium candidum, D. nobile Lindl. and D. moniliforme are composed by velamen, cortex, stele under the microscope. The germ is living and growing inside the cell of cortex as a peloton. According to the analysis for both mycorrhizas organ and nonmycorrhizas one, the contents of N,P,K in the former are about 2 5 times more than in the later, but the contents of microelment, such as Cu, Fe, Mn, Ca, Mg etc.