Effects of different treatments on seed dormancy breaking in Syrian Thistle (Notobasis syriaca) as the first report in Iran

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Zare Ahmad; Moosavi Seyed Amir

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Journal Paper

Paper Information

Journal: Iranian Journal of Field Crop Science Year:2021 | Volume: | Issue: Page(s): 133-144

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Information Journal Paper

Title

Effects of different treatments on seed dormancy breaking in Syrian Thistle (Notobasis syriaca) as the first report in Iran

Author(s)

Zare Ahmad | Moosavi Seyed Amir | Issue Writer Certificate

Keywords

chillingQ4

Germination percentageQ4

gibberrelinQ4

Sulfuric acidQ4

vigor indexQ4

Abstract

To evaluate the effects of different treatments on seed dormancy breaking of Notobasis, two separate experiments were conducted at Agricultural Sciences and Natural Resources University of Khuzestan, in 2017 with three replications. The first experiment included nine physical, mechanical and chemical treatments (control, surface scarification, intense scarification, one and two weeks of chilling at 4°C, soaking into hot water for two hours without scarification , soaking in 25°C distilled water for two hours with scarification and acid treatment for six and 12 minutes) based on completely randomized designs (CRD). The Second experiment was hormone priming arranged as a factorial experiment based on completely randomized design with gibberellin concentrations (0, 200, 400, 600, 800 and 1000 ppm) and priming duration (12 and 24 hour) as the treatments. The highest seed germination (40%) obtained from 12 minutes of acid treatment. Results showed that seed germination reached to 100% after priming seeds with GA3 concentrations for 12 hours. However, increase the priming durations to 24 hours, significantly declined seed germination to 47% in 200 and 400 ppm of GA3 concentrations. The Increase of GA3 concentrations in 12 hours led to a linear reduction of T50 from 31 hours in 200 ppm to 19 hours in 1000 ppm). In 24 hours of priming treatment, T50 followed a Gaussian function and the highest T50 (92 hours) was obtained from 600 ppm. It is recommended to immerse the seeds for 12 minutes in Sulfuric acid and prime with 400 ppm GA3 acid for 12 hours to break dormancy and increase the vigor index.

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