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于 2003 年研究了自然脱水过程中七叶树种子生理特性的变化。结果表明:七叶树种子对脱水高度敏感,为顽拗性种子。种子成熟采收时含水量高达 60.3%,种子在室温下自然干燥 30 天后,含水量下降到 30.2%,此时种子生活力完全丧失。在脱水初期,种子发芽率有所上升,但随后种子发芽率迅速降低。随着含水量的下降,种子浸出液相对电导率上升,但当含水量在 53.7% 到 50.9%之间时,种子浸出液相对电导率出现异常升高。同时种子超氧化物歧化酶(SOD)的活性随脱水时间的延长而下降,只有种子含水量在 53.7% 到 50.9%之间时出现例外。丙二醛(MDA)含量在脱水初期缓慢上升,在含水量下降到低于 50.9%时,丙二醛(MDA)含量快速上升。可溶性糖含量随脱水时间的延长缓慢上升。当种子含水量为 47%–60%时,种子发芽率较高,说明这一含水量区间有利于种子生活力的保持。图 6 参 13。
In 2003, we studied the changes of physiological characteristics of Aesculus hippophae after natural dehydration. The results showed that: Aesculus hippocastanum seeds highly sensitive to dehydration, recalcitrant seeds. Seed mature harvest water content as high as 60.3%, the seeds dried naturally at room temperature for 30 days, the water content dropped to 30.2%, at this time completely lost seed viability. In the early dehydration, seed germination rate increased, but then the germination rate decreased rapidly. With the decrease of water content, the relative conductivity of seed leachate increased, but when the water content was between 53.7% and 50.9%, the relative conductivity of seed leachate increased abnormally. At the same time, the activity of seed superoxide dismutase (SOD) decreased with the prolongation of dehydration time, except when the seed water content was between 53.7% and 50.9%. Malondialdehyde (MDA) content slowly increased in the early dehydration stage, and the content of malondialdehyde (MDA) rapidly increased when the water content decreased to below 50.9%. Soluble sugar content increased slowly with the extension of dehydration time. When the seed water content is 47% -60%, the seed germination rate is higher, indicating that this water content range is conducive to the maintenance of seed viability. Figure 6 Reference 13.