Mesostigma Explained

Mesostigma is a genus of unicellular biflagellate freshwater green algae, with a single species Mesostigma viride, covered by an outer layer of basket‐like scales instead of a cell wall.[1] AlgaeBase classifies it as the only genus in the family Mesostigmataceae, the only family in the order Mesostigmatales, the only order in the class Mesostigmatophyceae. It is now considered to be one of the earliest diverging members of green plants/algae (Viridiplantae).

Earlier studies were unable to resolve the position of the species, and it was often placed as a sister to all other green algae, as one of the basal members of the Streptophyta, or as close to Chaetosphaeridium.[2] [3] [4] More recent studies agree that Mesostigma and Chlorokybus form a clade, being the earliest diverging green plants.[5] [6] [7] [8]

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Notes and References

  1. Liang . Zhe . Geng . Yuke . Ji . Changmian . Du . Hai . Wong . Chui Eng . Zhang . Qian . Zhang . Ye . Zhang . Pingxian . Riaz . Adeel . Chachar . Sadaruddin . Ding . Yike . Wen . Jing . Wu . Yunwen . Wang . Mingcheng . Zheng . Hongkun . 2020 . Mesostigma viride Genome and Transcriptome Provide Insights into the Origin and Evolution of Streptophyta . Advanced Science . 7 . 1 . 1901850 . 10.1002/advs.201901850 . 6947507 . 31921561.
  2. 10.1016/S1434-4610(99)70041-6 . Marin B, Melkonian M . Michael Melkonian . 1999 . Mesostigmatophyceae, a new class of streptophyte green algae revealed by SSU rRNA sequence comparisons . Protist . 150 . 399–417 . 10714774 . 4 .
  3. The plant tree of life: an overview and some points of view . Jeffrey D. Palmer . Douglas E. Soltis . Mark W. Chase . amp . American Journal of Botany . 2004 . 91 . 1437–45 . 10.3732/ajb.91.10.1437 . 10 . 21652302. free .
  4. EST analysis of the scaly green flagellate Mesostigma viride (Streptophyta): Implications for the evolution of green plants (Viridiplantae) . Andreas Simon . Gernot Glöckner . Marius Felder . Michael Melkonian . Michael Melkonian . Burkhard Becker . amp. BMC Plant Biology . 2006 . 6 . 2 . 10.1186/1471-2229-6-2 . 16476162 . 1413533 . free .
  5. Lemieux C, Otis C, Turmel M . A clade uniting the green algae Mesostigma viride and Chlorokybus atmophyticus represents the deepest branch of the Streptophyta in chloroplast genome-based phylogenies . BMC Biol. . 5. 2 . 2007 . 17222354 . 1781420 . 10.1186/1741-7007-5-2 . free .
  6. Becker . B. . Marin . B. . 2009 . Streptophyte algae and the origin of embryophytes . Annals of Botany . 103 . 7 . 999–1004 . 10.1093/aob/mcp044 . amp . 19273476 . 2707909 .
  7. Sánchez-Baracaldo. Patricia. Raven. John A.. Pisani. Davide. Knoll. Andrew H.. 2017-09-12. Early photosynthetic eukaryotes inhabited low-salinity habitats. Proceedings of the National Academy of Sciences. 114. 37. E7737–E7745. 10.1073/pnas.1620089114. 28808007. 5603991. 2017PNAS..114E7737S . free.
  8. Gitzendanner. Matthew A.. Soltis. Pamela S.. Wong. Gane K.-S.. Ruhfel. Brad R.. Soltis. Douglas E.. 2018. Plastid phylogenomic analysis of green plants: A billion years of evolutionary history. American Journal of Botany. en. 105. 3. 291–301. 10.1002/ajb2.1048. 29603143. 0002-9122. free.

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