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Paper Information

Journal:   IRANIAN JOURNAL OF RANGE AND DESERT RESEARCH   FALL 2017 , Volume 24 , Number 3 (68) #R00445; Page(s) 503 To 512.

Effects of some chemical treatments to break the seed dormancy of soil seed bank in the Plour Rangelands

Author(s):  DANESHGAR M., ERFANZADEH R.*, Qelichnia h.
* Department of Range Management, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, Iran
This study aimed to evaluate the effect of different chemical treatments used for breaking of seed dormancy on soil seed bank properties (density, species richness and seed germination rate). Soil sampling was done in sub-alpine Polur rangelands in 2012 after natural cold stratification. Therefore, 10 (4 m2) plots were systematically established along two transects. Soil samples were then divided into five equal subsamples in the laboratory. Each subsample was treated by one seed dormancy breaking method, i. e. gibberllic acid (GA3: 500 ppm) for 48 hours, H2O2 (1%) for 48 hours, KNO3 (0. 1% and 0. 2%) for 72 hours and without treatment (control). All germinated seeds in the greenhouse were checked and counted for a 3-month period every week. ANOVA was applied to compare seed germination rate among different treatments. General Linear Model was used to evaluate the effect of method, soil depth and the interactions on soil seed bank characteristics. In addition, paired t-test was used to compare the properties of soil seed bank of each treatment between the two depths. The results showed that seed bank density per m2 was highest in the treatment of gibberllic acid in upper soil layer (4827. 2 seeds) compared with H2O2 (1%) for 48 hours (942. 7 seeds), KNO3 of 0. 1% (382. 8), KNO3 of 0. 2% (356. 6) and control (585. 4 seeds). Similarly, in the lower soil depth, the highest seed density was observed in the treatments of gibberllic acid and H2O2 (1%) for 48 hours, respectively. The average seed richness in upper and lower soil depths was highest in the treatments of gibberllic acid (2. 9 and 1. 9) and H2O2 (1%) for 48 hours (2. 6 and 1. 7), respectively (P<0. 05). Seed germination rate was highest in the treatment of gibberllic acid compared with the other treatments (P<0. 05). We concluded that chemical methods such as gibberllic acid could be useful for breaking seed dormancy in the precise studies of the soil seed bank.
Keyword(s): Density,germination,germination rate,gibberllic acid,species richness
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