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一些植物种子在成熟以后,需要隔一段时间才会在适宜的条件下萌发,这种特性就是种子的休眠。但并不是每类种子都有休眠的特性,这也是造成实验室忽略它的一个原因,因而导致对一些种子发芽率的不准确测定。造成种子休眠的原因也不一而足。休眠机制的多样性使人们不可能对种子搞“一刀切”的形式来对待。这就增加了测定其发芽率的难度。按休眠机制存在的部位可以把休眠分成两大类,一类是胚休眠——休眠的机制存在于胚内;二类是种皮强迫休眠——由于胚的包围结构,即种皮的作用而使种子保持休眠状态。当然在某些植物中也会出现以上两类休眠同时存在的现象,或者相继发生。 1 胚休眠
After some plant seeds mature, it takes some time to germinate under appropriate conditions, which is the seed dormancy. However, it is not a dormancy characteristic for each type of seed, which is one of the reasons that laboratories ignore it, leading to inaccurate determination of the germination rate of some seeds. There are also many reasons for the seeds to fall asleep. The variety of dormancy mechanisms makes it impossible for the seeds to be treated as “one size fits all”. This increases the difficulty of measuring its germination rate. According to the dormancy mechanism exists dormancy can be divided into two categories, one is the embryo dormancy - dormancy mechanism exists in the embryo; the second is the seed coat forced dormancy - the embryo surrounded by the structure, that the role of the seed coat and Keep the seeds dormant. Of course, in some plants, the simultaneous occurrence of the two types of dormancy may also occur or occur in succession. 1 embryo dormancy