桑种子生命力变化规律及冰冻贮藏研究

为探讨桑种质资源的保存技术,调查了桑种子生命力的变化规律。桑种子在自然条件下放置,先是发芽势急剧下降,放置2个月后由贮藏前的92.8%下降至18.50%~7.25%,之后是发芽率也急剧下降,放置3个月后由贮藏前的96%降至43%~22.5%,5个月后桑种子发芽率降至0。而在3~12℃环境中贮藏,2年后桑种子发芽势仅下降1.5%~2.8%,发芽率下降4.2%~5.5%,贮藏12年后桑种子发芽势和发芽率仍有53.25%和68.75%。研究了桑种子在-11~-17℃贮藏2年的生命力变化,结果与3~12℃贮藏2年的变化相仿。

Study on the Regularities of the Natural and Freezing Storage Vitality of Mulberry Seeds

The study was based on the budding vitality and sprout rate of mulberry seeds with different treatments.The budding vitality of seeds decreased from 92.80% to 18.50% ~ 7.25% when it were stored under the routine condition for two months,while the sprouting rate decreased from 96% to 43% ~ 22.5% after three months storage,and to 0 after five months storage. When the mulberry seeds were stored at 3 ~ 12 ℃,the budding vitality and sprouting rate decreased by 1.5% ~ 2.8% and 4.2%~5.5% for two years storage,respectively,and were 53.25% and 68.75% for twelve years' storage,respectively.When the mulberry seeds were stored at-11 ~-17 ℃ for two years,its budding vitality and sprouting rate were the same as that stored at 3 ~ 12 ℃.