附生兰科植物华石斛的克隆生长特性  

Clonal Growth Characteristic of Epiphytic Orchid Dendrobium sinense

作　　者：李奕佳 戚山江 宋希强[2] 张翠利 任明迅[2] 于旭东[2] Li Yijia;Qi Shanjiang;Song Xiqiang;Zhang Cuili;Ren Mingxun;Yu Xudong(Food and Biological Engineerin,Zhangzhou Institute of Technology,Zhangzhou,363000;Key Laboratory of Germplasm Resources of Tropical Special Ornamental Plants of Hainan Province,College of Forestry,Hainan University,Haikou,570228)

机构地区：[1]漳州职业技术学院食品工程学院,漳州363000 [2]海南大学林学院海南省热带特色花木资源生物学重点实验室,海口570228

出　　处：《分子植物育种》2021年第20期6927-6932,共6页Molecular Plant Breeding

基　　金：海南省自然科学基金创新研究团队项目(2018CXTD331)资助。

摘　　要：华石斛为兰科石斛属多年生附生植物,其在自然条件下结实率低,种子萌发条件苛刻。除了有性繁殖,华石斛也可以克隆繁殖。本研究在海南省霸王岭设置5条样带,对样带内的华石斛进行种群监测,研究克隆生长对华石斛种群生态的影响。结果表明:华石斛属于鳞茎型的密集克隆植物,假鳞茎间隔约0.35 cm。个体通过在一年生假鳞茎的基部形成新芽并借助分株间的物质能量传递完成生根展叶,如此循环来延长基株寿命。华石斛的分枝强度随着个体年龄的增长而增强,同一基株不同的分株生长情况差异很大。华石斛基株规模不会无限扩大,植株会根据分株密度自动调节拓展速度。华石斛的克隆生长为有性繁殖提供物质能量储备,并且通过增加生长轴而创造更多的有性生殖位点。本研究有助于华石斛生态种群的保育,并对其他相似特性的种群生物学研究提供参考。Dendrobium sinense is a perennial epiphytic orchid,which belongs to the genus of Dendrobium and the family of Orchidaceae.Under natural conditions,D.sinense has a low seed setting rate and the environmental requirements for its seed germination is a very stringent.Besides sexual propagation,asexual ways like clonal propagation is also found in D.sinense.In this study,five transects were set up in Bawang Ridge of Hainan Province to monitor the dynamic change of D.sinense population and study the influence of clonal propagation on population ecology of D.sinense.The results showed that:D.sinense belongs to a bulbous clonal plant,Spacer between pseudobulbs is only 0.35 cm around.Buds are tillered on the base of the one-year pseudobulb and development through the energy transfer between the ramets to continuation the genet life.Branching intensity enhanced as genet grow up.And different ramet from the genet have big difference in growth situation.The scale of genet can not expansion infinitely,D.sinense can adjust expend speed according to the density of ramets.Clonal growth provide material and energy reserves to sexual reproduction and create more sites for flowering by increasing the growth axis.

关 键 词：华石斛(Dendrobium sinense) 种群生态 克隆生长 有性繁殖 

分 类 号：S682.31[农业科学—观赏园艺]