mohsen zafaranieh; arman Azari
Abstract
The present study tries to quantify germination response of Guar (Cyamopsis tetragonoloba) to temperature and water potential. Performed in Vali-e-Asr University laboratory in 2020, it is a completely randomized design in a factorial arrangement with four replications. It aims at quantifying the rate ...
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The present study tries to quantify germination response of Guar (Cyamopsis tetragonoloba) to temperature and water potential. Performed in Vali-e-Asr University laboratory in 2020, it is a completely randomized design in a factorial arrangement with four replications. It aims at quantifying the rate of Guar germination in response to temperature, and water potential. The seeds have been germinated at seven temperatures (5, 10, 15, 20, 25, 30, and 35°C) and six water potentials (0, -0.2, -0.4, -0.6, -0.8, and -1 MPa). The results reveal that the Beta function is suitable for describing the response of seed germination temperature, and water potential. Under different water potentials, base, optimum, and maximum temperatures have been 7.3-12°C, 22.1-25.8°C, and 32.2-36°C, respectively. The hydrothermal time parameters are 268.3 bar °C h, -1.103 MPa and, 8.36°C for ɵHT (hydrothermal time constant). The data obtained from these models can be used to establish and manage guar for cultivation in different areas.
Shirin Taghizoghi; Elias Soltani; Iraj Allahdadi; Reza Sadeghi
Abstract
This research was conducted to investigate the effects of different seed coating treatments on the seed germination of canola under drought and salinity stresses. In order to, two factorial experiments were conducted based on completely randomized design with four replications in laboratory. In both ...
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This research was conducted to investigate the effects of different seed coating treatments on the seed germination of canola under drought and salinity stresses. In order to, two factorial experiments were conducted based on completely randomized design with four replications in laboratory. In both experiments, one of the factors were 10 different seed coating treatments. The second factor was different in two experiments: in the first experiment, the levels of drought stress of 0, -0.8, -1, and -1.2 MPa were considered, and in the second experiment, the levels of salinity stress of 0, 7, 14 and 21 ds/m NaCl were investigated. Results indicated that the lowest hydrotime constant (θH) were observed in T9 (22.627 MPa h), T3 (22.538 MPa h), and T6 (22.263 MPa h). The lowest base water potential (Ψb (50)) were belonged to T4 (-1.332 MPa) and T1 (-1.324 MPa). The maximum of germination percentage under salinity stress (Gmax) was observed in T2 (86.75%). The highest threshold to salinity tolerance (Xo) was belonged to T3 (16.38 ds/m). The highest germination rate was belonged to T3 in all levels of salinity. Totally, seed coating treatments of T3, T6 and T9 were the best treatments under drought stress and T3 was the best treatment under salinity stress.
Reyhaneh Pishkam Rad; Ali Izadi Darbandi; Maryam Shahbazi; Mehdi Fazel Najaf-Abadi; Hamid Reza Nikkhah; Raha Abedini; Morteza Barati
Abstract
In order to study the reaction of barley genotypes to drought, an experiment was conducted in a factorialdesign based on CRD for two wild ecotypes and four crop genotypes of barley in greenhouse. In thisstudy, the barley genotypes and wild ecotypes as the first factor and irrigation treatment with three ...
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In order to study the reaction of barley genotypes to drought, an experiment was conducted in a factorialdesign based on CRD for two wild ecotypes and four crop genotypes of barley in greenhouse. In thisstudy, the barley genotypes and wild ecotypes as the first factor and irrigation treatment with three levelsinclude 70 percent of water holding capacity of soil, 30 and 10 percent as the second factor wereconsidered as treatments. Analysis of growth and other morphological characteristics such as tillers, plantheight and leaf number and leaf area per plant and some physiological characteristics including therelative water content, leaf chlorophyll content, osmotic potential, osmotic adjustment, stomatalconductance, canopy temperature in each three treatments were measured. Analysis of variance showedthat the effect of drought on all traits and differences between genotypes were significant. Results ofcorrelation revealed that there is a significant and direct relationship between relative water content withosmotic potential and percentage of dried material. Path analysis identified that osmotic potential had themost direct effect on died material. The 41-1 and Morocco genotypes showed greater sensitivity thanother genotypes to the applied stress.