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一、种子的老化 1.老化。一般地说,种子如果满足其固有的发芽条件,或将采收后的种子经一定的后熟阶段,就进入了发芽阶段。但是,如果没有给予其发芽的适宜条件,在此期间,种子一边消耗自身的潜在能量,一边以最有限的生活力在等待着发芽的时机。这种能够等待时机的阶段,一般由遗传因子来决定,然而还有一个非常重要的是种子所置放的环境条件。一般认为种子老化要经过发芽率下降、完全不发芽、最后种子死亡。种子发芽力的丧失,并非意味着种子死亡,因此,假设一部分种子就是发芽,也不能转化为没有实用价值的老化种子。
First, the aging of the seed 1. Aging. In general, if the seeds meet their inherent germination conditions, or the seeds after harvest after a certain period of ripening, it entered the germination stage. However, without appropriate conditions for its germination, seeds, while consuming their own potential energy, are awaiting the germination with the most limited viability. This stage of waiting for an opportunity is usually determined by genetic factors, yet another very important one is the environmental conditions in which seeds are placed. It is generally believed that the germination rate of germinated seeds will decrease after germination, and germination will not occur at all. Finally, the seeds will die. The loss of seed germination does not mean the death of the seed, so it is assumed that part of the seed is germinating and can not be converted into an aging seed of no practical value.