Seyed Jalal Azari; Mahdi Parsa; A. Nezami; Reza Tavakkol Afshari; Jafar Nabati
Abstract
In order to determine the cardinal temperatures for seed germination of two lentil cultivars(Robat and Calposh) a factorial experimental were conducted base on completely randomized design with four replications. Germination temperatures includes 0, 5, 10, 15, 20, 25, 30 and 35°C and different priming ...
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In order to determine the cardinal temperatures for seed germination of two lentil cultivars(Robat and Calposh) a factorial experimental were conducted base on completely randomized design with four replications. Germination temperatures includes 0, 5, 10, 15, 20, 25, 30 and 35°C and different priming includes: control(non-priming), Gibberellic Acid(C19H22O6) 100 mg.l-1, Potassium Nitrate(KNO3) 500 mg.l-1, Zinc Sulfate(ZnSO4)100 mg.l-1, Dayan Seed Solution four ml.l-1 and Hydroperiming. The cumulative germination percentage and 50% germination rate were calculated and cardinal temperature diagrams of seed germination of two lentil varieties were plotted based on three regression models(Intersected line, Quadratic Plynomial and Dent- Like). The results showed that cumulative germination percentage and 50% germination rate were significantly affected by priming, cultivar, priming time, interaction of priming and cultivar, priming and time. The highest percentage of cumulative germination was obtained in interaction of Robat cultivar at 10°C. The highest germination rate of 50% was obtained in the interaction between Calposh cultivar and Gibberellic Acid. Among the models, the dent-like model had higher correlation coefficient in priming treatments. According to this model, the base temperature, lower optimum temperature, optimum upper and maximum values for Robat cultivar were 0.46, 23.82, 30.50 and 36.98, respectively, and for Calposh cultivar 1.44, 23.46, 30.30 and 36.87 °C. In generally, Robat cultivar is more cold tolerance than the Calposh cultivar and has a lower base temperature and Robat cultivar had higher vigor seed. Finally, the priming could reduce the cardinal temperatures of both cultivars and increase their germination ability at the lower temperatures.
A.R. Rabiei; A. Nezami; M. Goldani; M. Khajeh-Hosseini; M. Nassiri Mahallati
Abstract
Harvesting of medicinal plants from their natural habitats, put them in danger, hence their domestication is needed. In this context, knowledge of the properties of these plants, including the cardinal germination temperatures are necessary. In order to determine the cardinal temperatures and the effect ...
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Harvesting of medicinal plants from their natural habitats, put them in danger, hence their domestication is needed. In this context, knowledge of the properties of these plants, including the cardinal germination temperatures are necessary. In order to determine the cardinal temperatures and the effect of temperature on the percentage and rate of germination in Plantago major ecotypes (Birjand, Ghaen, Torbathydarieh, Mashhad, Kalat and Bojnord) an experiment was conducted based on factorial in a completely randomized design with 9 temperature levels (5, 10, 15, 20, 25, 30, 35, 40 and 45 °C) and four replications in Crop Physiology Laboratory, Ferdowsi University of Mashhad in 2013. To determine the cardinal temperatures Intersected-Lines Model and Five-Parameters Beta Model were used. Results showed that maximum germination percentage was obtained at 30 °C while maximum germination speed achieved at 35 °C in Bojnourd and Birjand ecotypes, respectively. The highest germination percentage was observed in Birjand ecotype at the temperature range of 20 to 35 °C. Based on models fitted depending on the ecotype, cardinal temperatures (minimum, optimum and maximum) germination were determined (6.3 to 9.8, 1.8 to 5°C) ,(31.1 to 35.9, 28.6 to 35.2°C) and (43.3 to 45.1, 45 to 45.6 °C) of Intersected-lines and Five-Parameters Beta Model, respectively. Diversity in cardinal temperature of plantago major ecotypes could be due to different environmental conditions where they were evolved and adapted
M. Janalizadeh Ghazvini; A. Nezami; H.R. Khazaie; M. Goldani; H. Feizi
Abstract
In order to investigate the effect of magneto priming on seed germination of sesame seed under water stress conditions, a factorial experiment based on a completely randomized design with three replications was carried out in 2014 in Ferdowsi University of Mashhad. Dry seeds of sesame exposed to magnetic ...
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In order to investigate the effect of magneto priming on seed germination of sesame seed under water stress conditions, a factorial experiment based on a completely randomized design with three replications was carried out in 2014 in Ferdowsi University of Mashhad. Dry seeds of sesame exposed to magnetic fields (control (no priming), 25 mT[1] for 10 minutes and 75 mT for 60 minutes) bulky, then they treated by Polyethylene glycol 6000 (PEG6000) with different potentials (control (distilled water), -2, -4, -6 and -8 bar). Finally, germination traits such as germination percentage, germination rate, plumule and radicle length, dry weight of plumule and radicle and seedling length and seedling weight vigour indices were measured. The results showed that magneto priming led to increment of germination rate, radicle and plumule length, radicle dry weight and seedling length and seedling weight vigour indices, especially in high levels of water stress compared with control treatment. Radicle length of magneto primed sesame seeds with 75 mT (for 60 minutes) in -8 bar was 16.6% and radicle dry weight of magneto primed seeds with 25 mT (for 10 minutes) at the same level of water stress, was 64.4% more than control (no priming). In addition in -8 bar potential, due to priming with 75 and 25 mT intensities of magnetic fields, seedling length and weight vigour indices enhanced 38% and 22.6%, respectively, in comparison to control treatment. [1] mili Tesla
A. Nezami; H.R. Khazaie; A.R. Barjasteh
Abstract
Because of the importance of the role of maternal environment during seed development on germination of produced seed and seedling establishment an experiment in a randomized complete block design base as a factorial was conducted to evaluate effects of drought stress (0.0, -0.2, -0.4, -0.8 and -1 MPa) ...
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Because of the importance of the role of maternal environment during seed development on germination of produced seed and seedling establishment an experiment in a randomized complete block design base as a factorial was conducted to evaluate effects of drought stress (0.0, -0.2, -0.4, -0.8 and -1 MPa) on germination and seedling growth characteristics of wild oat seed production under different irrigation regime (100,80 and 60 percentage of water requirement of wheat from stem elongation stage to the end of growth season) in Shahrood Agriculture research center. According to the results, maternal irrigation regime, drought stress and interaction effects between them had significant effect on germination and seedling characteristics of wild oat. The results showed that germination characteristics were decreased significantly with decrease of water potential to -1 MPa. The highest rate and percentage of germination and radicle length in this water potential was related to irrigation regime of 60% water requirement and the least of plumule dry weight was related to irrigation regime of 60 and 80% water requirement. Length and dry weight of plumule decreased more than those of radicle under drought stress conditions and showed greater sensitivity to reduced water potential. Lower dry weight and green area was observed in seedling that germinated at water potential more than -0.4 MPa. The results showed that drought stress during the seed formation caused significant changes in response of wild oat germination under stress condition.
