University of Tehran perss Journal of Crops Improvement 2008-8337 17 1 2015 04 21 Stomatal behavior of two rose cultivar under different light intensities Stomatal behavior of two rose cultivar under different light intensities 1 11 54777 10.22059/jci.2015.54777 FA Mansoureh Hatamian Former M.Sc. Student, Department of Horticulture, College of Aburaihan, University of Tehran, Pakdasht, Tehran, Iran Mostafa Arab Assistant Professor, Department of Horticulture, College of Aburaihan, University of Tehran, Pakdasht, Tehran, Iran Mahmoud Reza Roozban Assistant Professor, Department of Horticulture, College of Aburaihan, University of Tehran, Pakdasht, Tehran, Iran 0000-0001-9982-8761 Journal Article 2014 01 12 <strong>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/m^2­­/s. Based on the results, the highest stomatal length and width were found in 640 mmol/m^2­­/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.</strong> <strong>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/m^2­­/s. Based on the results, the highest stomatal length and width were found in 640 mmol/m^2­­/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.</strong> https://jci.ut.ac.ir/article_54777_311781cfcacc371cf8c958a4ea7e0235.pdf