Mansoureh Hatamian; Mostafa Arab; Mahmoud Reza Roozban
Abstract
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 ...
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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.
Mahdiye Askary; aliakbar Maghsoudi Moud; Vahidreza Saffari
Abstract
Salt stress is a factor limiting crop growth and productivity around the world. Developing salt tolerant cultivars using desired plant features has been considered as a way to cope with the problem. In this study, a factorial experiment was used in order to determine the effects of salt stress on stomatal ...
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Salt stress is a factor limiting crop growth and productivity around the world. Developing salt tolerant cultivars using desired plant features has been considered as a way to cope with the problem. In this study, a factorial experiment was used in order to determine the effects of salt stress on stomatal length at abaxial and adaxial leaf surfaces, relative water content (RWC) and transpiration rate (TR) under controlled condition. In another experiment yield performance (GY) of the same hybrids was evaluated in a split-plot experiment under field growing condition. Both experiments were based on a RCBD with 3 replications and conducted at the Faculty of Agriculture, Shahid Bahonar University of Kerman in 2011. Results showed that salt stress and hybrid have significant effects on all plant characteristics. Generally, all plant characteristics were decreased by increasing salt stress level. Significant correlation coefficients were found between TR and GY and also RWC and GY. Results also showed that the hybrid SC-704 has the highest levels of RWC and GY under salt stress conditions compared to the others indicating that it can be considered as a salt tolerant one.