Plastome reduction and gene content in New World Pilostyles (Apodanthaceae) unveils high similarities to African and Australian congeners

Arias-Agudelo, Laura Marcela; González, Favio; Isaza, Juan Pablo; Alzate, Juan F.; Pabón‐Mora, Natalia

doi:10.1016/j.ympev.2019.03.014

Cited by 18 publications

(18 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Orobanchaceae, a relatively young parasitic lineage [29], display the entire range of parasitic lifestyles [19] and allow for the visualization of most of the proposed stages of plastome breakdown [5,16,17]. However, plastomes of Orobanchaceae are not nearly as reduced in size or gene content as some mycoheterotrophes and a few parasitic plants, such as Pylostyles [12,21], Balanophora [22] or Hydnoraceae. The quadripartite plastome structure with two single copy regions and inverted repeats is common between most photoautotrophic plants and also retained in the majority of the parasitic lineages.…”

Section: Discussionmentioning

confidence: 99%

“…It is apparent that often gene order and plastome structure such as the quadripartite nature (large single copy region LSC, small single copy region SSC and inverted repeats IR) are retained in different parasitic plastomes. Yet, there are some exceptions such as the loss of the inverted repeat for example in the highly reduced plastomes of Pilostyles [12,21], Balanophora [22] and many other lineages of autotrophic plants [23][24][25][26]. Functionally the inverted repeats are hypothesized to stabilize the plastid genome [27]; therefore, their loss is shown to lead to more frequent rearrangements [28].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The First Plastid Genome of the Holoparasitic Genus Prosopanche (Hydnoraceae)

Jost

Naumann

Rocamundi

et al. 2020

Plants

View full text Add to dashboard Cite

Plastomes of parasitic and mycoheterotrophic plants show different degrees of reduction depending on the plants’ level of heterotrophy and host dependence in comparison to photoautotrophic sister species, and the amount of time since heterotrophic dependence was established. In all but the most recent heterotrophic lineages, this reduction involves substantial decrease in genome size and gene content and sometimes alterations of genome structure. Here, we present the first plastid genome of the holoparasitic genus Prosopanche, which shows clear signs of functionality. The plastome of Prosopanche americana has a length of 28,191 bp and contains only 24 unique genes, i.e., 14 ribosomal protein genes, four ribosomal RNA genes, five genes coding for tRNAs and three genes with other or unknown function (accD, ycf1, ycf2). The inverted repeat has been lost. Despite the split of Prosopanche and Hydnora about 54 MYA ago, the level of genome reduction is strikingly congruent between the two holoparasites although highly dissimilar nucleotide sequences are observed. Our results lead to two possible evolutionary scenarios that will be tested in the future with a larger sampling: 1) a Hydnoraceae plastome, similar to those of Hydnora and Prosopanche today, existed already in the most recent common ancestor and has not changed much with respect to gene content and structure, or 2) the genome similarities we observe today are the result of two independent evolutionary trajectories leading to almost the same endpoint. The first hypothesis would be most parsimonious whereas the second would point to taxon dependent essential gene sets for plants released from photosynthetic constraints.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The First Plastid Genome of the Holoparasitic Genus Prosopanche (Hydnoraceae)

Jost

Naumann

Rocamundi

et al. 2020

Plants

View full text Add to dashboard Cite

show abstract

“…In each chromatophore genome, > 90% of genes are shared among all strains (Lhee et al, 2019) and are under strong purifying selection (dN/dS ratios << 1) (Reyes-Prieto et al, 2010). In comparison, the canonical Archaeplastida-derived plastids have at most c. 250 genes (in some red algae) and as few as c. 7 genes (in holoparasites of legumes) (Vries & Archibald, 2018;Arias-Agudelo et al, 2019) with genome sizes varying between c. 10 kbp to > 1 Mbp. The chromatophore genome, while similar in size to the largest plastid genomes (Muñoz-G omez et al, 2017), contains c. threefold more genes and retains most genes encoding proteins essential for photosynthetic electron transport, light harvesting and ATP synthesis (Nowack et al, 2008).…”

Section: Differing Evolutionary Trajectories Of Host and Endosymbiont Genomesmentioning

confidence: 99%

Why is primary endosymbiosis so rare?

et al. 2021

View full text Add to dashboard Cite

Endosymbiosis is a relationship between two organisms wherein one cell resides inside the other. This affiliation, when stable and beneficial for the 'host' cell, can result in massive genetic innovation with the foremost examples being the evolution of eukaryotic organelles, the mitochondria and plastids. Despite its critical evolutionary role, there is limited knowledge about how endosymbiosis is initially established and how host-endosymbiont biology is integrated. Here, we explore this issue, using as our model the rhizarian amoeba Paulinella, which represents an independent case of primary plastid origin that occurred c. 120 million yr ago. We propose the 'chassis and engine' model that provides a theoretical framework for understanding primary plastid endosymbiosis, potentially explaining why it is so rare.

show abstract

“…However, exceptions to all of these features have been found. The greatly reduced plastomes of Pilostyles range from 11-15 kb and contain only seven functioning genes (Arias-Agudelo et al, 2019). In contrast the plastome of Pelargonium ✕ hortorum has expanded to 218 kb including unusually long inverted repeats (Chumley et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Comparative plastomics of Amaryllidaceae: Inverted repeat expansion and the degradation of the ndh genes in Strumaria truncata Jacq

Könyves

Bilsborrow

Christodoulou

et al. 2021

Preprint

View full text Add to dashboard Cite

Amaryllidaceae is a widespread and distinctive plant family contributing both food and ornamental plants. Here we present an initial survey of plastomes across the family and report on both structural rearrangements and gene losses. Most plastomes in the family are of similar gene arrangement and content however some taxa have shown gains in plastome length while in several taxa there is evidence of gene loss. Strumaria truncata shows a substantial loss of ndh family genes while three other taxa show loss of cemA, which has been reported only rarely. Our sparse sampling of the family has detected sufficient variation to suggest further sampling across the family could be a rich source of new information on plastome variation and evolution.

show abstract

Plastome reduction and gene content in New World Pilostyles (Apodanthaceae) unveils high similarities to African and Australian congeners

Cited by 18 publications

References 51 publications

The First Plastid Genome of the Holoparasitic Genus Prosopanche (Hydnoraceae)

The First Plastid Genome of the Holoparasitic Genus Prosopanche (Hydnoraceae)

Why is primary endosymbiosis so rare?

Comparative plastomics of Amaryllidaceae: Inverted repeat expansion and the degradation of the ndh genes in Strumaria truncata Jacq

Contact Info

Product

Resources

About