Current Genetics

, 54:111 | Cite as

From chloroplasts to “cryptic” plastids: evolution of plastid genomes in parasitic plants

Review Article

Abstract

To date, more than 130 plastid genomes (plastomes) have been completely sequenced. Of those, 12 are strongly reduced plastid genomes from heterotrophic plants or plant-related species that exhibit a parasitic lifestyle. Half of these species are land plants while the other half consists of unicellular species that have evolved from photosynthetic algae. Due to their specialized lifestyle, parasitic lineages experienced a loss of evolutionary pressure on the plastid genome and, in particular, on the photosynthesis-related genes. This made them tolerant for the accumulation of detrimental mutations and deletions in plastid genes. That parasitic plants are naturally occurring plastome mutants makes them a rich source of information concerning plastome evolution and the mechanisms that are involved. This review reports on the progress made in recent years with parasitic plant plastomes and attempts to summarize what we can learn from analysing the genomes of functionally reduced, or cryptic, plastids. Particularly, the loss of genes for a plastid-encoded RNA polymerase as well as an intron maturase and the retention of the gene for the large subunit of the Calvin cycle enzyme Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) in selected species will be discussed.

Keywords

Cryptic plastids MatK intron maturase Parasitic plants Plastid genome evolution Plastid polymerases Rubisco 

Abbreviations

bp

Basepairs

NEP

Nuclear-endoded RNA polymerase

PEP

Plastid encoded RNA polymerase

Rubisco

Ribulose-1,5-bisphosphate carboxylase/oxygenase

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.Department of BiologyUniversity of TromsøTromsøNorway

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