The main causes for dormancy of water dropwort aren ' t seed coat obstacle and physiological dormancy of embryo , but some inhibitors which may be the key factor cousing deep dormancy of water dropwort 但种皮障碍、胚的生理休眠不是水芹种子休眠的主要原因；发芽抑制物质可能是引起水芹种子深休眠的关键性因素。
Restriction of vegetative growth to ensure flower initiation , defoliation to prevent the onset of dormancy , stimulation of adequate and uniform budburst , and avoidance of secondary dormancy are essential for success of non - dormancy culture 控制营养生长、保证花芽分化，使树体避开休眠，促进足够多的芽整齐萌发，避免二次休眠的发生是无休眠栽培成功的4项重要保证。
We studied water permeability of seed coat , development of embroy , absence or presence of germination inhibitors and some other aspects in order to confirm the dormany causes of mulberry seeds from north of heilongjiang province 摘要从种皮透性、胚的发育、是否存在萌发抑制物等方面，对产于黑龙江省的实生桑种子休眠原因进行了研究，初步认为，胚的生理性休眠是实生桑种子休眠的主要原因。
( 2 ) it is the tactics of keeping the seed storehouse under the adverse environment that seed spreading has the dispersiveness of time , space heterogeneity of the seed spreading and the dormancy in summer , ( 3 ) the seed coat of lepidium pertoliatum l . and lepidium apetalum willd . make the seed bigger , which is useful to promote the seed sprouting and developing of seedling by absorbing the around moisture 具体表现为： ( 1 )植物的生长发育以及植物的生长节律，均受到环境的影响； ( 2 )种子的分批成熟，种子传播具有空间随机性以及种子具有夏季休眠的特性，都是种子在恶劣环境下保存种子库的策略( 3 )抱茎独行菜和独行菜的种衣一方面可以使种子大粒化，另外还利于吸收水分有助于促进种子萌发和幼苗发育，这些对种群的延续具有重要的意义。
