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.
Hossein Sadeghi; Babak Mirshekarnejhad; Saman Sheidaei; Bita Oskouei
Abstract
To evaluate the germination traits and mechanical damage of soybean seed during processing stages, anexperiment was conducted in a factorial experiment based on completely randomized design with 18treatments at Mazandaran province (Sari) in 2009-10. The experiment factors included different seedprocessing ...
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To evaluate the germination traits and mechanical damage of soybean seed during processing stages, anexperiment was conducted in a factorial experiment based on completely randomized design with 18treatments at Mazandaran province (Sari) in 2009-10. The experiment factors included different seedprocessing stages (before cleaning, after elevator, after pre cleaning, after cleaning, after drying and afterpackaging) and three cultivars (‘Telar’, ‘Sari’ and ‘Line 033’). Results showed that cultivar 033 had thehighest germination percentage (83.5%), germination percentage after accelerated aging (71.6%) andseedling vigor index (12.76) and lowest electrical conductivity (41.73μScm-1gr-1) and it was noticed that‘Telar’ cultivar had the highest cracked seed percentage (10.38). Effect of different seed processing stepswas significant on all traits. So that, the lowest germination percentage (78.36%), highest rate of brokenseed percentage (16.72%) and highest cracked seed percentage (13.55%) was obtained after elevator step.Interaction effect of cultivar × different processing steps were not significant on all traits, but meanscomparison showed that the highest (86.9%) was obtained in 033 cultivar after drying step and lowest(77.8%) germination percentage was attained from ‘Telar’ cultivar after elevator.