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紫椴种子属深休眠,不经催芽处理当年播种不出苗。为了探讨其休眠原因和催芽处理方法,于1988~1989年进行了试验研究。结果表明,紫椴种皮结构致密,阻止水分和气体透过;种子的胚乳、果皮、种皮均含有发芽抑制物质,其种子水浸液对白菜、萝卜发芽有明显的抑制作用,这二者是造成紫椴种子休眠的重要原因。经对比试验认为,混沙变温催芽处理的效果最好,其中采用1个月高温4个月低温的变温处理,种子场圃发芽率达43.5%,是其他方法处理的1.5~2.0倍,且出苗齐,便于管理。
Tiliaceae seeds are deep dormant, without germination to deal with seedlings that year. In order to investigate the reason of dormancy and the method of germination, experimental studies were carried out from 1988 to 1989. The results showed that Triticum aestivum seedling had a compact structure and prevented the penetration of water and gas. The endosperm, pericarp and seed coat of seeds all contained germination inhibitory substances, and the seed aqueous solution obviously inhibited the germination of Chinese cabbage and radish Tilapia seeds are caused by an important reason for sleeping. According to the comparison test, it is concluded that the effect of spurting by mixing sand with temperature is the best, among which the temperature is 4 months at 1 month, the seed germination rate is 43.5%, which is 1.5-2.0 times that of other treatments, Qi, easy to manage.