关键词: 毛建草, 珠芽, 生根, 种源地, 气候变化

Abstract: To explore the bulbil forming rule of Dracocephalum rupestre,the abilities of forming and rooting,process of bulbil were studied by cultivation and field investigation. The results showed that the provenances and plant individual had an effect on the formation of the bulbils. The phenomenon that cultivated plants could produce bulbils indicated the change of growth environment affected the formation of bulbils of Dracocephalum rupestre.The bulbils were borne on the leaf axil of rachis after flowering. The rosulate leaves of bulbil were borne on the woody bulb. The bulbils close to the surface of soil easily rooted,but the bulbils located on the top of rachis could not root and fell with the withered aboveground plant parts. The bulbil had the ability to root in morphogenesis and physiology. The bulbil rooting and growing into seedling depended on the position of bulbil borne on the floral axis and touched the soil. The generation of bulbils was caused by climate change,but the mechanism was not clear and need further exploration. This study firstly reported Dracocephalum rupestre could produce bulbil,and provided certain basis for exploring biological evolution of Dracocephalum rupestre,meanwhile,enriched the bulbil plant species.

Key words: Dracocephalum rupestre, Bulbil, Root, Provenances, Climate change