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  Global Journal of Biochemistry. Volume 2, Issue 2 (2011) pp. 81-95
  Research Article Free Article
Evolutionary rates of land plant hemoglobins at the protein level
  Raúl Arredondo-Peter  
Laboratorio de Biofísica y Biología Molecular, Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias, Universidad Autónoma del Estado de Morelos, Ave. Universidad 1001, Col. Chamilpa, 62210 Cuernavaca, Morelos, México
  Three types of hemoglobins (Hbs) exist in land plants: symbiotic Hbs (including to leghemoglobins (Lbs)), non-symbiotic Hbs (nsHbs), and truncated Hbs (tHbs). Although a general phylogeny and evolution for land plant Hbs emerged over the last several years little is known about the evolutionary rate of this group of proteins. This work reports the rate of divergence of selected land plant Hbs using moss (Ceratodon purpureus and Physcomitrella patens) Hbs as query sequences. Results suggest that nsHbs evolved at high rates during the early diversification of land plants but slowed down previous to the origin of magnoliophyta, and that the rate of divergence was apparently higher in class 2 nsHbs and Lbs than in class 1 nsHbs. Also, results suggest that the tHb lineage evolved at a rather constant rate, although variation was also detected in primitive land plant tHbs. These observations suggest that Hbs were highly variable during the colonization of land by plants but divergence rates decreased along the evolution of land plants under the effect of stabilizing selection.
  Evolution; Evolutionary rates; Hemoglobin; Land plants; Non-symbiotic; Truncated  

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