H. Farhadi; M. Azizi; S.H. Nemati
Abstract
Introduction: Drought is an event that happens due to lack of rainfall in a period of time. The occurrence of drought, reduces available soil water, but water losses through evaporation and transpiration is constantly increasing. The first stage of the plant, which may be faced with drought, is ...
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Introduction: Drought is an event that happens due to lack of rainfall in a period of time. The occurrence of drought, reduces available soil water, but water losses through evaporation and transpiration is constantly increasing. The first stage of the plant, which may be faced with drought, is germinating. Since Germination begins with water uptake, lack of water at this stage in terms of duration and intensity of the stress causes or reduce germination percentage and germination rate. Because of the heterogeneity of soils in the field and lack of control of the environmental factors such as drought, laboratory research on the stress is considered. Some of these methods can be used to study the reaction of the landraces to the solutions from materials polyethylene glycol. This study aimed to investigate the characteristics of the native population of fenugreek germinating rate under drought stress conditions and identify landrace was incurred.
Materials and Methods: To investigate the effect of drought stress on germination and seedling growth characteristics of native landrace fenugreek, an experiment was conducted in a Completely Randomized Design with three replications in Seed Laboratory of University of Mashhad in 2014. The experiment treatments consisted of eight landraces of fenugreek of Esfahan, Tabriz, Hamedan, Sari, Challous, Amol, Mashhad and Yassooj on polyethylene glycol 6000 (PEG 6000) at four levels: (0, 3, 6 and 9 times) were replicated three times. The stress test for the simulation of polyethylene glycol 6000 was used and the amount of material needed to create each of the stress levels using the formula Michel and Kaufmann respectively. To (control) and distilled water was used. Landraces seed of fenugreek the city of Esfahan, Tabriz, Hamedan, Sari, Challous, Amol, Mashhad and Yassooj purchased before the start of the experiment with a three percent solution of hypochlorite for two minutes to disinfect and then were washed three times with distilled water on the twelfth day, seeds and traits such as root length and root out the Petri measure.
Results and Discussion: In the study the interactions between landrace and drought, the rate of decline in most of the traits was related to native populations of fenugreek, Tabriz, Hamadan, Sari, Challous, Amol, Yasuj and Mashhad, respectively (-9 times) compared to control (0 times). As can be seen, the Isfahan landrace was more stable in most of the traits due to changes in drought levels. On the other hand, as the drought stress increased, the percentage and rate of germination of fenugreek seeds decreased. Fenugreek seed germination rate and percentage with increased drought stress the germination rate under drought stress sensitivity was higher than the percentage of germinating. The plants grow in different stages react differently to drought show seed germination and seedling production and a dry condition indicates that the plant is a potential for drought tolerance but that does not mean that the seedlings start to grow in dry conditions, can continue to grow in the same conditions.
simin irankhah; Ali Ganjeali; Mehrdad Lahouti; Mansour mashreghi
Abstract
Introduction: Fenugreek (Trigonellafoenum-graecum L.) is a traditional medicinal plant belonging to the legume family Fabaceae. Diverse groups of microorganisms are symbiotic with Fenugreek roots system. This integration leads to significant increases in the development and production by increasing nitrogen ...
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Introduction: Fenugreek (Trigonellafoenum-graecum L.) is a traditional medicinal plant belonging to the legume family Fabaceae. Diverse groups of microorganisms are symbiotic with Fenugreek roots system. This integration leads to significant increases in the development and production by increasing nitrogen fixation, phytohormones production, siderophores and phosphate solubilization. Plant growth-promoting bacteria increase plant growth byimproving nutrientuptake and phytohormones production. In addition, the beneficial effect of these bacteria could be due totheirinteractionwithArbuscularMycorrhizal fungi(VAM). Drought is one of the major limiting factors for crop production in many parts of the world including Iran. Symbiotic microorganisms can enhance plant tolerance to drought. This experiment was carried out to investigate the effect of Vesicular ArbuscularMycorrhiza (VAM) and Plant Growth Promoting Rhizobacteria (PGPR) on morphological and biochemical characteristics of Fenugreek in drought stress conditions.
Materials and Methods: The experiment was carried out in completely random design with 3 replications.There were four treatments including inoculation with Pseudomonas putida, inoculation with Glomusintraradices, combined association of Pseudomonas putida and Glomusintraradices and untreated as a check under drought stress (40% of field capacity) and non-stress conditions (80% of field capacity). In this experiment fiveseeds were sowninplastic pots. Before sowing, seeds were inoculated with microorganisms. In order to inoculation ofseed with Mycorrhizal fungi, for each kilogram of soil, 100 grams of powder containing 10 to 15 thousand spores of fungal soil (produced by the biotech company Toos) was added to three centimeters of soil in the pot. For seed inoculation with Plant Growth Promoting Rhizobacteria, the growth curve of the bacteria was drawn at first and then the best time for the growth of bacteria was determined. The bacteria at the best time and at a dilution of 0.5 McFarland was added to the seed.Pots were placed in a growth chamber (with a temperature of 25 ° C and 16 hours of light and 8 hours of darkness photoperiod).After ten days of planting, the water treatment was applied and continued until the end of the experiment.
Results and Discussion:The results showed that the use of co -inoculation treatment ofP.putidaandG.intraradicesand application of G.intraradices aloneat non-stress conditions did not make a significant difference on the amount of plant biomass. In drought conditions, application of G.intraradice alone had significant difference (P≤0.05) compare with control (no inoculation microorganisms) for biomass.In stress conditions, P.putida inoculation and also in combination with G.intraradicesincreased biomass in compare with control (no inoculation of micro-organisms), but this increasing was not statistically significant.VAMare important ecological symbiotic with roots are important component of the ecosystem and affect the absorption of minerals through the roots. The results of the present study showed that the amount of phosphorus in all of treatments was increased and the greatest increase was related to G.intraradicetreatment.The results also showed that drought stress increased the leaf soluble proteins in compared with non-stress condition. Increasing the concentration of soluble proteins under drought stress can be related to increased protein synthesis that maybe related to adaptation and reprogramming under new situation and itprotect the cells against stress. The results showed that the use of co -inoculation treatment ofP.putidaand G.intraradices, as well as each individual treatment, increased the amount of soluble proteins in leaves.In the case of the Diosgenin percentage, drought stress reduced the amount of Diosgenin percentage. Underdrought stress conditions, use of co -inoculation treatment ofP.putidaand G.intraradicesand application of G.intraradicewithout presence of bacteria made a significant increase in plant Diosgenin concentration.
Conclusion: Theresults revealed that seed treatment with Pseudomonas putida and Glomusintraradices increased the biomass, protein content, phosphorus uptake and diosgenin percent in Fenugreek under drought stress condition. Since Diosgenin is very important medicinal compound, inoculation of fenugreek with these microorganisms can be a way to increase the Diosgenin production.
