mohsen malek; Farshid Ghaderi-Far; Benjamin Torabi; HamidReza sadeghipour
Abstract
To investigate the effects of drying methods (desiccation treatment), heat shock and osmotic stress treatments on the viability of primed seeds from different rapeseed cultivars, an experiment was conducted in 2017-2018 at the Seed Research Laboratory of Gorgan University of Agricultural Sciences and ...
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To investigate the effects of drying methods (desiccation treatment), heat shock and osmotic stress treatments on the viability of primed seeds from different rapeseed cultivars, an experiment was conducted in 2017-2018 at the Seed Research Laboratory of Gorgan University of Agricultural Sciences and Natural Resources. In this study, seeds of three canola cultivars i.e. Dk-xpower, Teraper and Hayola50, which had observed priming treatments, were exposed to desiccation, heat shock and osmotic stress treatments. Thereafter, to investigate the effects of different treatments, the treated seeds were subjected to controlled deterioration test. Finally, after fitting the three-parameter logistic model to germination percentage during controlled deterioration test, time for decrease of germination to 50% was Calculated and used as the criterion for comparing seed viability. Results showed that the response of rapeseed cultivars to different treatments were different. Also, priming methods and different treatments in drying phase of primed seeds, displayed different effects on seeds' lifespan. In general, heat shock treatments were found efficient in Dk-xpower and Traper cultivars as they increased seeds' lifespan. In contrast, osmotic stress treatments often had negative effects on seed viability in all canola cultivars. Even, "osmopriming" and subsequent slow drying of primed seeds had more negative effects than "hydroperiming" associated with fast drying methods.
Mohammad Kamalpouradib; Vahid Rouhi; Saadollah Houshmand; Abdolrahman Mohammadkhani; Hamid Zargari
Abstract
Pollen storage could facilitate the date palm hand pollination through saving time and space. The main concern is maintaining pollen viability, which is greatly cultivar dependent and is influenced by storage condition. In this study, to address this issue, the effects of cultivar, storage ...
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Pollen storage could facilitate the date palm hand pollination through saving time and space. The main concern is maintaining pollen viability, which is greatly cultivar dependent and is influenced by storage condition. In this study, to address this issue, the effects of cultivar, storage temperature, and time on pollen germination were investigated. A factorial experiment was laid out in a completely randomized design with three replicates using four cultivars ‘Kazeroon (7013)’, ‘Lar (7035)’, ‘Darab (7016)’ and ‘Qyr-va Karzin (7021)’, four storage temperatures (RT (20 ± 5), 4, -20 and -80°C) and six storage periods (60, 120, 150, 180, 210 and 375 days). Anova of data showed significant effects of variety, storage temperature, storage time and their interactions on pollen germination. The pollen germination rate increased with decreasing temperature. When pollens were stored for up to 150 days, the germination rates of all varieties initially increased then decreased. Overall, the optimum temperature for preserving pollen grains of tested cultivars is -80°C and the highest pollen grain longevity is related to ‘Qyr-va Karzin (7021)’ after one year.