超干处理对山竹岩黄芪种子活力的影响

采用室温硅胶干燥处理,山竹岩黄芪(Hedysarum fruticosum)种子含水量由8.01%分别降至4.45%,3.42%和2.65%。然后用铝箔袋密封不同含水量的种子,50℃恒温条件下老化处理10天。研究超干及人工加速老化处理种子活力相关生理生化指标的变化。结果表明:对种子进行超干处理,含水量降低至3.42%,种子活力维持较高水平;当含水量下降至2.65%,种子电导率、丙二醛含量显著增加,表明种子因超干处理受到损伤。高温老化后,随含水量降低,种子活力呈增加趋势,2.65%含水量种子的活力处于最高水平。超干处理增强了山竹岩黄芪种子抗老化能力。种子脱水下限与种子种类有关,最适含水量的确定尚需根据实际贮藏温度研究确定。

Effects of Ultra-drying on Vigor of Hedysarum fruticosum Seeds

Hedysarum fruticosum seeds were dried by silica gel at room temperature to reduce the moisture content from 8.01％ to 4.45％,3.42％ and 2.65％ respectively.The accelerated ageing treatment were conducted by storing the seeds at 50℃ for 10 days,and some physiological and biochemical indicates were tested.The results showed that the seed vigor maintained at a high level when the moisture content decreased to 3.42％.However,the electric conductivity and the content of MDA increased significantly in seeds of 2.65％ moisture content.These results showed the seeds were damaged by ultradrying to 2.65％ moisture content.After ageing,the seed vigor showed an increasing trend with the reduction of water content.Results showed that vigor of seed of 2.65 ％ moisture content was at the highest level.The ageingresistant capability and storability of seeds were enhanced strongly after ultra-drying.Lowest limit of seed dehydration was associated with seed variety,and the optimum seed water content need to be studied according to the actual storage temperature.