A. Pasandi Pour; H. Farahbakhsh
Abstract
Higher plants are self-supporting organisms that can build their organic molecular compounds from mineral nutrients absorbed from the environment. Therefore, sufficient access to the optimum level of nutrients in the environment is very important. The main objective of this study was to determine ...
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Higher plants are self-supporting organisms that can build their organic molecular compounds from mineral nutrients absorbed from the environment. Therefore, sufficient access to the optimum level of nutrients in the environment is very important. The main objective of this study was to determine the nutritional requirements of different ecotypes of henna (Lowsonia inermis L.) as a medicinal- industrial plant (Bam, Shahdad and Roodbar) based on nitrogen, phosphorus and potassium (N: K: P, 0: 0: 0, 100: 50: 50 , 200: 100: 100, 300: 200: 150 Kg ha-1) in Kerman climatological condition. The results showed that the interaction of ecotype × fertilizer was significant only for leaf and total dry yield at the probability level of 5%. Mean comparison of this interaction showed that all three examined ecotypes had the highest leaf dry yield in the fertilizer ratio of 300: 200: 150 and did not have a significant difference with each other. The effect of ecotype was significant only on net photosynthesis and stomatal conductance and the highest mean of these traits belonged to the Shahdad ecotype. In this study, the simple effect of fertilizer treatment was significant for all traits studied except for specific leaf area and specific leaf weight. The highest mean of leaf area index, net photosynthesis and stomatal conductance was recorded for the 300: 200: 150 fertilizer ratio, while in the case of transpiration rate and crop growth rate there was no significant difference between 300: 200: 150 and 200: 100: 100 combination treatments. In general, in order to achieve maximum crop growth rate and suitable leaf area index to produce the highest leaf dry yield of henna in Shahdad and Roodbar ecotypes, the fertilizer ratio of 300: 200: 150, and in the Bam ecotype, the fertilizer ratio of 200: 100: 100 under similar conditions of this study seems to be appropriate.
F. Salarpour; H. Farahbakhsh
Abstract
Recently, the application of SA has increased to improve plants’ resistance to stresses such as drought. Hence to investigate SA effects on morphophysiological characteristics of Fennel (Foeniculum vulgare Mill.) under drought stress, a split plot experiment based on latin square design with three ...
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Recently, the application of SA has increased to improve plants’ resistance to stresses such as drought. Hence to investigate SA effects on morphophysiological characteristics of Fennel (Foeniculum vulgare Mill.) under drought stress, a split plot experiment based on latin square design with three replications was carried out at the research farm of Shahid Bahonar University of Kerman in 2012. Three levels of drought stress (50, 75 and 100% of field capacity) and three concentrations of SA (0, 0.5 and 1mM) were considered as main and sub-plot treatments, respectively. Foliar application of SA was performed at 3-to 4-leaf growth stage and before application of drought stress. Results showed that the drought stress reduced the number of fertile umbel/plant, the number of fertile umbellate/umbel, the number of grains/umbellate, relative water content, chlorophyll, carotenoids and grain yield, while increased electrolyte leakage when compared with control. Salicylic acid reduced electrolyte leakage, while increased the number of fertile umbel/plant, the number of fertile umbellate/umbel, the number of grains/umbellate, RWC, chlorophyll, carotenoids and grain yield when compared to control (No SA application). Interaction of drought stress × SA on the number of fertile umbel/plant, the number of fertile umbellate/umbel, RWC, carotenoids and grain yield was significant. Increasing photosynthetic pigments, RWC and decreasing electrolyte leakage indicates a reduction in oxidative damage and implies SA role in tolerance of fennel to drought stress.
R. Kabiri; H. Farahbakhsh; F. Nasibi
Abstract
This research was aimed to evaluate the effect of drought stress, induced by polyethylene glycol (PEG6000), on physiological and biochemical parameters of black cumin (Nigella sativa L.). The traits were included: shoot dry weight, electrolyte leakage, relative water content, photosynthetic pigments ...
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This research was aimed to evaluate the effect of drought stress, induced by polyethylene glycol (PEG6000), on physiological and biochemical parameters of black cumin (Nigella sativa L.). The traits were included: shoot dry weight, electrolyte leakage, relative water content, photosynthetic pigments (chlorophyll a, b, total chlorophyll and carotenoids), malondialdehyde and other aldehyde's contents, anthocyanines, polyphenol compounds, flavonoids, phenylalanine ammonialayse activity, soluble sugar content and protein. An experiment was conducted as a completely randomized design with three replications under hydroponic culture at research laboratory of Shahid Bahonar University of Kerman in 2011. Treatments were four levels of drought stress (0, -0.2, -0.4 and -0.6 MPa). Results showed that drought stress caused a significant reduction in shoot dry weight, relative water content, photosynthetic pigments, anthocyanines, polyphenol compounds, flavonoids and protein and an increase in electrolyte leakage, malondialdehyde content, phenylalanine ammonialayse activity and soluble sugar. Based on the obtained results, it seems that this plant is sensitive to drought stress, and the application of exogenous protective compounds could increase the antioxidant capacity of plant against stress condition.
