Overview

Brief Summary

Gnetum is one of three genera in the gymnosperm group of seed plants known as Gnetales, whose relationship to other plants has long been a subject of controversy among botanists and evolutionary biologists. Gnetum consists of fewer than three dozen species, mainly large woody climbers (two are trees). Ten species occur in tropical South America, one in West Africa, and the remainder in tropical and subtropical Asia. The seeds and foliage of some species are eaten by humans.

(Won and Renner 2006)

  • Won, H. and S.S. Renner. 2006. Dating dispersal and radiation in the gymnosperm Gnetum (Gnetales) - Clock calibration when outgroup relationships are uncertain. Systematic Biology 55(4): 610-622.
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
                                        
Specimen Records:92Public Records:80
Specimens with Sequences:89Public Species:28
Specimens with Barcodes:88Public BINs:0
Species:28         
Species With Barcodes:27         
          
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Locations of barcode samples

Collection Sites: world map showing specimen collection locations for Gnetum

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Barcode data

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Wikipedia

Gnetum

Gnetum is a genus of about 30-35 species of gymnosperms, the sole genus in the family Gnetaceae and order Gnetales. They are tropical evergreen trees, shrubs and lianas. Unlike other gymnosperms they possess vessel elements in the xylem. Some species have been proposed to have been the first plants to be insect pollinated as their fossils occur in association with the extinct pollinating scorpionflies.[1] Molecular phylogenies based on nuclear and plastid sequences from most of the species indicate hybridization among some of the Southeast Asian species. Fossil-calibrated molecular-clocks suggest that the Gnetum lineages now found in Africa, South America, and Southeast Asia are the result of ancient long-distance dispersal across seawater.[2] [3]

Contents

Species

Uses

Many Gnetum species are edible, with the seeds being roasted, and the foliage used as a leaf vegetable. Some are also valued in herbal medicine.

References

  1. ^ Ren D, Labandeira CC, Santiago-Blay JA, Rasnitsyn A, Shih CK, Bashkuev A, Logan MA, Hotton CL, Dilcher D. (2009). Probable Pollination Mode Before Angiosperms: Eurasian, Long-Proboscid Scorpionflies. Science, 326 (5954), 840-847. doi:10.1126/science.1178338
  2. ^ Won H, Renner SS: The internal transcribed spacer of nuclear ribosomal DNA in the gymnosperm Gnetum. Molecular Phylogenetics and Evolution 2005, 36:581-597. doi:10.1016/j.ympev.2005.03.011
  3. ^ Won, H., and S. S. Renner. 2006. Dating dispersal and radiation in the gymnosperm Gnetum (Gnetales) – clock calibration when outgroup relationships are uncertain. Systematic Biology 55(4): 610-622. doi:10.1080/10635150600812619
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