Stomatal behavior of two rose cultivar under different light intensities

Light as an important environmental factor، influences many aspects of plant growth and development. Leaves are different in some characters including stomatal behavior under shade or light conditions. In this study، the effects of different levels of light intensity on stomatal behavior of two rose cultivars، ‘Gulmira’ and ‘Red One’، were evaluated under controlled conditions. To obtain different light intensities، green polyethylene nets were used. Treatments were light intensities of 1200 (Control)، 640، 520 and 240 mmol/m2­­/s. Based on the results، the highest stomatal length and width were found in 640 mmol/m2­­/s in both cultivars. Regarding stomatal density، there were no significant differences among different levels of light intensities، although cultivar effect was significant. Therefore، stomatal density was higher in ‘Gulmira’ than ‘Red One’. Also، stomatal conductance was significant only between cultivars، and there was no significant difference among light treatments. However there was an increasing trend of stomatal conductance with increasing light intensities.