Apostasia shenzhenica genome
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     The Apostasioideae are a small subfamily of orchids that includes only two genera (Apostasia and Neuwiedia), consisting of terrestrial species confined to the humid areas of southeast Asia, Japan, and northern Australia. Although Apostasioideae share some synapomorphies with other orchids (for example, small seeds with a reduced embryo and a myco-heterotrophic protocorm stage), they possess several unique traits, the most conspicuous of which is their floral morphology. Apostasia has a non-resupinate, solanum-type flower with anthers closely encircling the stigma (including postgenital fusion), a long ovary, and an actinomorphic perianth with an undifferentiated labellum. Three stamens (two of which are fertile) are basally fused to the style, forming a relatively simple gynostemium, and the anthers contain powdery pollen (grains not unified into pollinia). These characteristics differ from those of other Orchidaceae subfamilies, which have three sepals, three petals (of which one has specialized to form the labellum), and stamens and pistil fused into a more complex gynostemium , but are similar to those of some species of Hypoxidaceae (a sister family to Orchidaceae, in the order Asparagales). “The Apostasia genome and the evolution of orchids”. Cai et al. 2017. Nature.
  • Apostasia

  • Apostasia

  • MADS-box genes involved in orchid morphological evolution.