元宝槭种子休眠生理的研究

A Study on the Dormant Physiology of Acer truncatum Seeds

本文对元宝槭种子休眠生理进行了研究。发现未受损的完整种子,在休眠结束之前,需经低温2～5℃层积40～50天处理才可萌发;而剥去果皮、种皮的种子在恒温25℃,每天光照8h条件下,1.5天就萌发,6天萌发率达99％。影响种子休眠的原因主要是元宝槭种子的果皮、种皮对种胚的吸氧量起着阻滞作用,对种胚的膨胀有物理机械性限制作用。其次是抑制物——单宁的向外弥散。经过层积的种子由于酶活性增强,促进了胚内营养物质的转化,因而提高了种子对抑制作用的抵抗能力,使休眠期缩短,萌发期提前。

Dormancy is one of the characteristics of Acer truncation seeds. During the dormant period, pericarp and seed coat played an important and manifold role. Before the state of dormancy was over, the undamaged perfect seeds had to be kept under a condition of low temperature (2-5℃), and a stratification for 40~50 days. Under the condition of 25℃, the seeds after removing mulch could germinate without pre-treatment. Seed mulch has inhibitiry effect on oxygen absorption of seed embryo and limits the swelling of embryo physically and mechanically, and hinders the spread of inhitor to seed germination. During the process of stratification treatment, with the continuous increase of nutritive substance in embryo, the resistance of seeds to inhibitors increased uninterruptedly. Eventually the seeds overcame the inhibition form outer tissue and germinated.