Study on the morphology and cytology of Agropyron cristatum

Agropyron cristatum belongs to crosspollination plants. The Characters of this kind of plants are big variation between strains in populations and rich genetic diversity. Research showed that A.cristatum form had many variation types; the three types of subterranean stem were axial root type，axialrhizome type and rhizome type; the types of leaves epidermis covers were upper and lower epidermis of leaves with dense bristle，upper epidermis of leaves with much fuzz lower epidermis of leaves with a little fuzz，upper epidermis of leaves with little fuzz and lower epidermis of leaves with no fuzz;the types of seeds lemma were dense villus, spacing pubescence and hairless and glabrous etc.types.Research on chromosome showed that the chromosomes of A.cristatum had two ploidy levels of diploid and triploid types.The number of diploid chromosome of A.cristatum was fourteen.The karyotype formula was 2n=14=10m（1sat）+4sm （2sat）The karyotype type was 1A；the number of tetraploid chromosome was twentyeight；the karyotype formula was 2n=28=22m+6sm and the karyotype type was 1A.