During seed storage, some seeds traits might change and seed vigor may decrease in bad storage situation, to determine the effect of some hormones in different concentrations, the study was conducted in biotechnology laboratory of Agriculture University of Tehran in 2012. In this study, seeds aging were ...
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During seed storage, some seeds traits might change and seed vigor may decrease in bad storage situation, to determine the effect of some hormones in different concentrations, the study was conducted in biotechnology laboratory of Agriculture University of Tehran in 2012. In this study, seeds aging were tested for 0, 2 and 4 days and after they were primed with distilled water, salicylic acid, IAA and kinetin. Traits measured included germination percent, germination rate, shoot length, root length, seedling dry matter and vigor. The results showed that hydro priming improved many characteristics in fresh seeds but it's not very useful for seeds under ageing conditions. For rising seed vigor in these cases, it's better to use hormones, especially salicylic acid which is called tolerant hormone. Using IAA because of broadleaf control property, it doesn’t seem logically. The best treatment in this study was salicylic acid in low concentration
In order to survey the effects of dormancy-breaking methods on Kelussia odoratissmaseeds a completely randomized design was implemented at five replications in Research Institute of Forest and Rangelands, 2010. Treatments were: seed stratification (4°C for 4, 6, 8 and 10 weeks), socking in gibberllic ...
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In order to survey the effects of dormancy-breaking methods on Kelussia odoratissmaseeds a completely randomized design was implemented at five replications in Research Institute of Forest and Rangelands, 2010. Treatments were: seed stratification (4°C for 4, 6, 8 and 10 weeks), socking in gibberllic acid (250, 500 and 1000 ppm solutionfor 12 hr) and seed stratification and gibberllic acid combination (500 ppm +4°C for 4,6,8 and 10 weeks). Results showed significant differences among treatments (pKelussia odoratissma α-amylase activity obtained of 500 ppm +4°C for 8 and 10weeks (14.2 and 13.8 nm seed-1 min-2). Results indicated Kelussia odoratissma seed treatment with 500 ppm +4°C for 8 and 10weeks was the best treatment for induction Kelussia odoratissma seed germination
In order to study the effect ofhormonal andphysical priming techniques on seed germination and seedling establishment of wheat, an experiment was conducted in Islamic Azad University, Tabriz, Iran, in 3 replications during 2012-13. Studied factors were hormonal seed priming materials(gibberlic acid and ...
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In order to study the effect ofhormonal andphysical priming techniques on seed germination and seedling establishment of wheat, an experiment was conducted in Islamic Azad University, Tabriz, Iran, in 3 replications during 2012-13. Studied factors were hormonal seed priming materials(gibberlic acid and kinetin in 50, 100, 150 and 200 ppm concentrations) and physical seed priming agents (ultrasonic, laser, magnetic field, gamma and beta radiations for 5 and 10 minutes) included control. Results indicated that those seeds treated in gibberlic acid and kinetin of 50-150 ppm germinated faster. Except of 50 ppm gibberlic acid and kinetin of, other treatments had lower seedling dry weight. Effect of laser and magnetic field for 5 minutes was effective on time to final germination than other treatments. Seedling from magnetic field for 5 minutes had greater vigor than ultrasonic and beta. Wheat seeds priming before sowing with gibberlic acid and kinetin or laser and magnetic field is recommended.
Plant growth regulators are the main factors in grain yield formation However, their physiological roles have not been fully identified. On the other hand, water stress is the main factor in reducing grain yield and germination characteristics. To this end, two experiments were carried out in the research ...
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Plant growth regulators are the main factors in grain yield formation However, their physiological roles have not been fully identified. On the other hand, water stress is the main factor in reducing grain yield and germination characteristics. To this end, two experiments were carried out in the research farm and laboratory of Campus of Agriculture and Natural Resources of Razi University in Iran during 2010-2011 and 2011-2012 years in a split-plot factorial arranged in a randomized complete blocks design with three replications. The irrigation treatments including non water stress and water deficiency stress (from anthesis and continued until physiological maturity). The wheat cultivars including Pishtaz, Marvdasht, DN-11and 336 and the foliar application of indole acetic acid (dose of 50 μM)treatments including control, used at the beginning of grain growth (from anthesis) and at the beginning of grain filling (from 14 days after anthesis) at the entire plants. Under non water stress, the grain yield of Marvdasht was greater than other cultivars. More yield reduction of this Marvdasht in water deficiency compared to other cultivars showed more sensitivity of this cultivar to post-anthesis water deficiency and DN-11 in this situation had the lowest grain yield reduction. Foliar application of indole acetic acid (IAA) at the beginning of grain growth caused the most increase in grain yield. In this situation, IAA caused more increase in the grain yield of Marvdasht cultivar. But, this treatment at the beginning of grain filling did not have such effect. Seeds were obtained from the field were studied in the view of germination and seedling growth characteristics in the laboratory and the result showed that, plumule length and germination percentage were not affected by post-anthesis water deficiency. Under post-anthesis water deficiency, Plumule to radicle ratio and germination rate significantly increased and other parameters showed a significant decrease. Mean comparison of foliar application of IAA at the beginning of grain filling showed that this significantly increased germination characteristics. With respect to these results, Auxin may via positive effects on seed quality and not quantity (seed weight) may be had positive effects on seed germination characteristics.
In order to evaluate cardinal temperatures of milk thistle (Silybum marianum)germination an experiment was carried out in the laboratory of Plant Production College, Gorgan University Agricultural Science and natural resources. Seven temperatures in a completelyrandomized design with four replications ...
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In order to evaluate cardinal temperatures of milk thistle (Silybum marianum)germination an experiment was carried out in the laboratory of Plant Production College, Gorgan University Agricultural Science and natural resources. Seven temperatures in a completelyrandomized design with four replications was used. Temperatures were 5 to 35ºC by 5ºC intervals. The seeds with 2 mm radicles were counted as germinated seeds.The germination rate percentage and cumulative seed germination percentage were calculated for each given temperatures.Cardinal temperatures (T-base, T-optimum and T-ceiling), also, were estimated using eight non linear regression models. The effect of temperature on total germination percentage, time to 50% germination (D50) and germination rate based on 1/D50 and mean germination time inverse (1/MGT) was significant at 1% of probability level. Results indicated that by increasing temperature up to 15ºC germination increased and after that declined. Based on the highest R² and the lowest MAE and RMSE segmented model was determined as the superior model. Thus, Tb, To and Tc for D50 (time to %50 germination) were estimated as 2.75, 31.51 and 38 using segmented model.To calculate germinationrate 1/D50 index was better than 1/MGT due to higher regression coefficient and less RMSE.
Due toproblems arising from the use of natural methods acceptable herbicides for weed control has been identified. Allelopathyby releasing allochimical be one way to control weeds is worthwhile. In order to show the effects of aqueous extracts of Tarrgon and Savory on germination and growth ...
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Due toproblems arising from the use of natural methods acceptable herbicides for weed control has been identified. Allelopathyby releasing allochimical be one way to control weeds is worthwhile. In order to show the effects of aqueous extracts of Tarrgon and Savory on germination and growth of weeds Savory Oats seed in greenhouse, in College of Agricultural of azad university of shiraz, shiraz, Fars provenice, Iran wasconducted.experimentin a randomized complete block design with three replications and three factors were performed(The first factorin both savory and tarragon plant surface and the second factor and the third factor 4 levels in both leaf and stem). 7, 9, 11 and 13 days after sowing germinated seeds counted and the various parameters, was measured. resultsindicated that theuse ofsavory andtarragonleaves andstems of plantsmay reducethegermination andearly growthtraitsandoatsvehiclehas affected.SavoryTarragonplantdebriseffectwas moreandmoretraitshas reducedby 6%. A recentevaluationofallelopathiceffectsonweeds,crop residues, andothermaterialstoreduce reliance onherbicidesisnormaldamage. Future studies of this plant can be used to control weeds, oats .
To investigate the role of mucilage in germination of medicinal plants in drought stress conditions, germination test conducted on 4 replications of 25 seeds of 13 species of medicinal plants with mucilage from the families of Lamiaceae, Brassicaceae, Fabaceae, Linaceae and Plantaginaceae in 9 cm diameter ...
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To investigate the role of mucilage in germination of medicinal plants in drought stress conditions, germination test conducted on 4 replications of 25 seeds of 13 species of medicinal plants with mucilage from the families of Lamiaceae, Brassicaceae, Fabaceae, Linaceae and Plantaginaceae in 9 cm diameter petridishes with filter paper premoistined with distilled water in the Seed Laboratory, Faculty of Agriculture, Ferdowsi University of Mashhad in 2012. Different levels of waterpotential (0, -0.1, -0.2, -0.3, -0.4 MPa) using PEG applied and germination percent and mean germination time (MGT) of the species were determined.Results showed osmotic potential levels had a significant effect on the germination percent and mean germination time (MGT) of the species (P≤0.01). P. psylliumM. officinalis and L. usitatissimum were tolerant while, S.officinalis,A.homalocarpum and P.major were sensitive species and other species showed moderate tolerance. It seems amount of the mucilage of species was effective on tolerance of the species. The positive effect of the mucilage on the reduction of stress in the majority of the species may have an ecological benefit in the harsh conditions for the germination of the species with mucilage.
Drought stresses are unfavorableenvironmentalfactors that affect crop growth especially in the early stagesof germination. Seed germination is a complex process that involves three main phases that in phases before radicle protrusion (second germination phase) many process was occurred in embryo axes ...
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Drought stresses are unfavorableenvironmentalfactors that affect crop growth especially in the early stagesof germination. Seed germination is a complex process that involves three main phases that in phases before radicle protrusion (second germination phase) many process was occurred in embryo axes as living part of seed. This study was carried out to understand the effectof drought stress onprotein patterns in the second phase of germination. In order to analysis the effects of drought stress (-12 bar) on wheatembryo proteome (Sardari and Qods respectively tolerant and susceptiblecultivar), factorialexperiment was conducted in a Randomized completely block designwith three replications. Drought stress decreased germination percentage and causedadverse effects on the proteins pattern. Two-dimensional gel electrophoresis analysis of wheat embryo axis showed 1000spotswerereproducible that 25 spots between treatments indicated significant differences on 5% level. In control condition, in comparison tolerant to susceptiblecultivar, 10 and 13 spots and in stress condition, 11 and 13 spots were down and up regulated respectively.Possible proteins such as alpha amylase inhibitor, 1–Cys peroxiredoxin and Heat shock proteins may be involve in drought stress during seed germination. The results showed that the frequency of these proteins under drought stress depends on severity and amount of stress and imbibition time.
Evaluating of an appropriate model is critical for quantifying the response of germination rate to temperature and determination of cardinal temperatures. This study was conducted to evaluate different nonlinear regression models to describe response of germination rate to temperature in Salvia species. ...
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Evaluating of an appropriate model is critical for quantifying the response of germination rate to temperature and determination of cardinal temperatures. This study was conducted to evaluate different nonlinear regression models to describe response of germination rate to temperature in Salvia species. The regression models were dent-like, segmented and beta. Root mean squareof error, coefficient of determination, correlation coefficient and regression of predicted values versus observed ones were used to find the appropriate model(s). Dent-like and segment models were superior compared to the Beta model in Salvia species. It was concluded that these models can be used to quantify response of Salvia species germination to temperature and to obtain cardinal temperature of germination. These parameters are required to predict Salvia species germination and emergence.
In order to survey the effects of dormancy-breaking methods on Kelussia odoratissmaseeds a completely randomized design was implemented at five replications in Research Institute of Forest and Rangelands, 2010. Treatments were: seed stratification (4°C for 4, 6, 8 and 10 weeks), socking in gibberllic ...
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In order to survey the effects of dormancy-breaking methods on Kelussia odoratissmaseeds a completely randomized design was implemented at five replications in Research Institute of Forest and Rangelands, 2010. Treatments were: seed stratification (4°C for 4, 6, 8 and 10 weeks), socking in gibberllic acid (250, 500 and 1000 ppm solutionfor 12 hr) and seed stratification and gibberllic acid combination (500 ppm +4°C for 4,6,8 and 10 weeks). Results showed significant differences among treatments (pKelussia odoratissma α-amylase activity obtained of 500 ppm +4°C for 8 and 10weeks (14.2 and 13.8 nm seed-1 min-2). Results indicated Kelussia odoratissma seed treatment with 500 ppm +4°C for 8 and 10weeks was the best treatment for induction Kelussia odoratissma seed germination