بررسي ساختار تشريحي ساقه تعدادي از گونه هاي ASTRAGALUS L. مولد كتيرا در ايران

Investigation on stem cross section and wood analysis kinds of gun producer Astragalus L. species in Iran.

Stem cross section of 23 species of Astragalus L.were prepared by microthomal methods. Materials were divided into 3 groups: less than 3 years old, 3 years old and 3 or more than 3 years old. These are as follows: Species of tragacantha sect. Microphysa, sect, sugenus sect. Microphysa, sect. Campylantus: sec. Hymenostegies, sect. Poterion, sect. megalocystis, sect. Acidodes, sect, Acantophace, sect. Tricholabus. Stems were cut by microthome and painted by saffranin and fast-green. Also, stem of A. cordatus {sect.Hymeostegies), A. microphysa (sect. Microphysa) A. horridus (sect. Acntophace) and A. keyserlengii {Tragacantha subgenus) were placed in Jeffery solution for 5 days and were macerated. In all species, wood is diffuse porous, compact tension wood. They have apotracheal boundry axial parenchyma that is terminal and diffuse parenchyma. The ray is heterocellular and multiseriate. A. fasciculifolium contains scleried and all of them have gelatinous fiber. Type of vessel member perforation plate is simple and with tail. Vessal membrane has reticulated thickening, opposite pitted, Alternate pitted and minute alternate pitted, some times bordered tit is changed by simple pit. Scleried are branched- mainly trichoscleried. Vessel membrane is very narrow and long and arrangement is oblique and radial chain pore.