title: [Reproductive biology of Dendrobium officinale (Orchidaceae) in Danxia landform].
abstract: OBJECTIVE
  To reveal the breeding system and endangered mechanism of Dendrobium officinale in Danxia landform.
  
  
  METHODS
  The habitat, growth traits, floral phenology, propagation characteristic and status of resource destruction of D. officinale in Danxia landform were investigated.
  
  
  RESULTS
  The results showed that D. officinale grew in poor condition and the growth summit appeared in spring; its two- or three-years-old stems could be bloomed; higher seed-setting rate would be obtained when pollinated in time; the ovary began swelling after pollinated four or five days, until about 185 days later, the fruit matured; the seed-setting rate was very low (0.31%) in natural environment; only one clone was generated from one stem in a clump in annual.
  
  
  CONCLUSIONS
  D. officinale mainly reproduces by clonal propagation; over-collection is key factor which leads D. officinale to be in endangered status at present in this region.
authors.affiliation: College of Horticulture and Landscape Architecture, Hainan University, Danzhou 571737, China.
authors.forename: Pingrong
authors.initials: P
authors.lastname: He
authors.forename: Xiqiang
authors.initials: X
authors.lastname: Song
authors.forename: Yibo
authors.initials: Y
authors.lastname: Luo
authors.forename: Minggao
authors.initials: M
authors.lastname: He
mesh_terms: D003247:Conservation of Natural Resources; D031667:Dendrobium / Q000254:growth & development / Q000502:physiology*; D017753:Ecosystem; D035264:Flowers / Q000254:growth & development; D005843:Geography; D012098:Reproduction; D012621:Seasons; D013997:Time Factors