Gholamreza Chenarani; Mahmood Shoor; Ali Tehranifar; Seyyed Hossein Nemati; Gholamhossein Davarynejad
Abstract
CO2 enrichment in greenhouse is a suitable way which reduces production time, better growth vigor and also higher plant quality. The main aim of this study was to find out the effects of artificial CO2 enrichment under different light levels on rooting of the ornamental foliage Codiaeum variegatum. The ...
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CO2 enrichment in greenhouse is a suitable way which reduces production time, better growth vigor and also higher plant quality. The main aim of this study was to find out the effects of artificial CO2 enrichment under different light levels on rooting of the ornamental foliage Codiaeum variegatum. The experiment was planned as a split plot based on a completely randomized design. CO2 was considered as the main plots (380 as control, 750 and 1050 ppm) and these light intensities as the sub plots (10000 as control, 12000 and 14000 Lux) were used. Results showed a significant increase on measured traits with elevating levels of CO2 and light. Highest measured values of different traits were observed at 12000 Lux light intensity and 750 ppm CO2 enrichment. Light intensity × CO2 interaction had a significant effect on leaf length, leaf number, root quality, root volume, root length (P≤0.01) and rooting percentage at (P≤0.05). Spad chlorophyll unit was not noticeably significant. Rooting and plant growth generally raised along with both light intensity and CO2 elevation.
Ali Akbar Shokouhian; Gholamhossein Davarynejad; Ali Tehranifar; Ali Rasoulzadeh
Abstract
The base of nut production in almond is flower buds set with best quality and quantity. Although the process of flower buds set is controlled by genetic characteristics, however it affected with inside and outside diverse factors. To understand relationship between these factors for achieve to annual ...
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The base of nut production in almond is flower buds set with best quality and quantity. Although the process of flower buds set is controlled by genetic characteristics, however it affected with inside and outside diverse factors. To understand relationship between these factors for achieve to annual and regular nut production economically. An experiment was conducted in order to evaluate effects of effective microorganisms (EM) under water stress conditions on bud flower formation in two genotypes of almond trees in Department of Horticultural Science, Faculty of Agriculture, Ferdowsi University of Mashhad, in 2011. In this research effects of two different concentrations (0 and 5%) of EM and three levels of aridity stress treatments (100, 66, and 33% of FC) on number of flower buds in two genotypes (H1and H2) of almond was evaluated. This experiment was arranged as a factorial experiments based on a randomized complete blocks design with four replications. Results showed that the EM increased amount of leaf area, chlorophyll, storage protein, N, K and P in leaves. In this research, effects of different genotypes, EM and irrigation levels on number of flower bud set were significantly different at the %1 level. Number of flower bud formation increased by treatments of EM application, H1 genotype and irrigation level of FC% 100. There was significant interaction between treatments for this trait at %1 level. The best result was obtained from interaction between H2 genotype and irrigation using level of FC% 100 and EM application.
Zahra Setayesh-Mehr; Ali Ganjeali
Abstract
In order to study the effect of different water potential on Anethum graveolens L. an experiment was conducted. This study was carried out based on completely randomized design with three replications. In this experiment, morpho-physiological characteristics were assessed under hydroponic. Stress was ...
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In order to study the effect of different water potential on Anethum graveolens L. an experiment was conducted. This study was carried out based on completely randomized design with three replications. In this experiment, morpho-physiological characteristics were assessed under hydroponic. Stress was established with PEG 6000, and drought potentials were: 0 (control), -1.5, -2, -2.5 and -3 bar. The results showed that effect of drought stress on morphological characteristics including: shoot length, root length, surface of leaves and leaves number was significant (p≤0.01). Mean comparison of treatments showed that with increasing drought stress, all parameters decreased. Effect of drought stress on amount of a, b and total chlorophyll, carotenoid, soluble proteins, phenolic compounds and K+, P and Ca+2 concentrations in shoot and root were significant (p≤0.01). Effect of drought stress on chlorophyll a/b ratio was significant (p≤0.05). Mean comparison of treatments showed that with increasing drought stress, amount of chlorophyll, carotenoid, soluble proteins, K+, P and Ca+2 and shoot/root K+ ratio decreased where as amount of phenolic compounds in shoot and root increased. Shoot to root length ratio and shoot/root K+ ratio were not influenced by drought stress (p≤0.05). From the results of this study, it can be deducted that dill medicinal plant respond to drought stress by increasing of phenolic compounds.
Morteza Goldani; Yahya Selahvarzi; Jafar Nabati; Morteza Alirezaie Noghondar
Abstract
Salinity is one of the environmental stresses that have limited influence on the crop growth. Oxidative process is a secondary stress due to salinity. Oregano is enumerated as one of the most important of medicinal plant that its production and development is possible in Iran. In order to study the effect ...
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Salinity is one of the environmental stresses that have limited influence on the crop growth. Oxidative process is a secondary stress due to salinity. Oregano is enumerated as one of the most important of medicinal plant that its production and development is possible in Iran. In order to study the effect of exogenous application of hydrogen peroxide on salt tolerance in oregano (Origanum majorana L.) an experiment was conducted in greenhouse conditions. This study was designed as factorial based on completely randomized design with 3 replications. Different concentration of hydrogen peroxide (0, 2.5 and 5 mM) and four levels of NaCl (0, 50, 10 and 150 mM) were treated in this study. Results showed that foliar application of hydrogen peroxide can improve shoot and root dry weight and alleviate adverse effects of salinity. In the other hand, high concentration of hydrogen peroxide (5mM) increased total chlorophyll and caroteoid content about 46.6 and 100.6 percent comparing to control plant, respectively. Salt stress had no significant effect on cellular hydrogen peroxide, but it increased free proline and reduced K:Na ratio. While hydrogen peroxide content, free proline and K:Na ratio were increased 104.6, 320.7 and 77.8 percent by high level of hydrogen peroxide, respectively. The final result showed that foliar application of hydrogen peroxide decreased salt stress.
