SOME ANATOMICAL CHARACTERS OF STEM IN DIFFERENT POPULATION OF BROMUS INERMIS

Resistance of plants has a great importance in cultivation and more dependent on the anatomic construction stem and leaf. Bromus inermis(smooth brome) is a perennial plant. Seeds remain viable for 2-10 years. B. inermis can spread by rhizomes and seed dispersed by wind. Seeds can be dispersed by ants and birds. Bromus inermis occurs on roadsides, riverbanks, edges of fields, prairies, woods and pastures. It prefers sandy soils to salty ones (Sather, 1987). B. inermis needs well aerated soils with a pH from 5.5-8. B. inermis is not tolerant of anaerobic, calcareous, or salty conditions, but can tolerate temperatures as low as negative 38 degrees Celsius (ANHP, 2004). It is also very drought tolerant which can be attributed to its deeply penetrating root system (Sather, 1987) B. inermis is not shade tolerant, and seed production, number of shoots and rhizomes, and dry weight of plant decreases when B. inermis does not receive sufficient sunlight. B. inermis is planted to increase forage or to reduce erosion after fire (Grace et al, 2002). Smooth brome is used as hay, pasture, or silage for livestock, as it is high in protein. It works well in a cropping system with alfalfa or other legumes. B. inermis' massive root system makes it a very effective erosion control. There are investigated some anatomic characters of stem and leaf, those organs are playing very important role on the yield production. On the cross section of stem and leaf 10 individuals to three locations are analyzed : number of stomas, number vascular bundles, number of sclerenchymal cell rows, thickness of mechanic tissue. Achieved results shows that those parameters have varied subject to the populations and internodes position on the stem and leaf.