棉种贮藏过程中温度对发芽率和休眠的影响

 对常温、0℃和18℃ 3种温度条件下密闭贮藏期间及4年后棉花毛子和包衣子的发芽率、发芽势、新鲜不发芽种子的百分率等进行了分析比较。结果表明，4年的贮藏期间，温度单因素对包衣子的发芽率和发芽势及毛子的发芽率变化影响不显著，对毛子的发芽势的变化影响显著，对二者的休眠率变化影响极显著；温度和年限交互作用对毛子和包衣子发芽率和休眠影响显著，温度显著影响了棉种4年内发芽率和发芽势增长和休眠解除的时间，低温显著减缓棉种休眠的解除,延缓了劣变的发生；4年后，常温下毛子和包衣子已经劣变；18℃冻藏则使棉种最大程度地保持了休眠的状态；0℃种质库贮藏毛子和包衣子各指标均优于另外两种条件。

Effects of Temperature on Germination and Dormancy of Cottonseeds

]In order to know the effect of temperature on germination and dormancy of cottonseeds during storage, fuzzy and coated cottonseeds with dormancy were studied, germination,germination potential（GP）, the percentage of fresh seeds(PF), fresh weight and length of seedling were analyzed and compared during and after 4 years storage. Fuzzy and coated samples with dormancy were stored at room temperature, 0℃and -18℃ from April 2005 to April 2008. Seeds containing 11% or less moisture were sealed in the plastic bags and stored. One hundred seeds were sampled from each sample to conduct germination trials at 30℃ for a 7 days period every year. Effects of one factor of temperature,and two factors reciprocal action of  temperature and storage periods were studied during 4 years storage. The one factor results showed that temperature was not significant to the change of germination and GP of coated seeds and germination of fuzzy seeds, it was obviously significant to GP of fuzzy seeds and  PF of both fuzzy and coated. The reciprocal action effects of temperature and years effected the germination and dormancy of fuzzy and coated seeds significantly. Effects of temperature on fresh weight and length of seedlings were different between fuzzy and coated seeds. Lower temperature could postpone the dormancy breaking, decelerated the speed of the increase of germination, put off the deterioration, and increased the longevity of cottonseeds.The results of 0℃ were better than the other two temperture.