Understanding evolution in Poales: Insights from Eriocaulaceae plastome

Darshetkar, Ashwini M.; Datar, Mandar N.; Tamhankar, Shubhada; Li, Pan; Choudhary, Ritesh Kumar

doi:10.1371/journal.pone.0221423

Cited by 22 publications

(31 citation statements)

References 51 publications

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“…All other proteins required by the chloroplast, however, are encoded by the nuclear genome. All of the protein synthesis and photosynthetic machinery used by the plastid is encoded by its own genome, commonly referred to as the plastome, that is arranged in a quadripartite structure [ 17 , 18 , 19 , 20 ]. The size of the plastid genome of land plants is reported to range from 120 to 190 kb [ 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Gene Loss and Evolution of the Plastome

Mohanta

Mishra

Khan

et al. 2020

Genes

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Chloroplasts are unique organelles within the plant cells and are responsible for sustaining life forms on the earth due to their ability to conduct photosynthesis. Multiple functional genes within the chloroplast are responsible for a variety of metabolic processes that occur in the chloroplast. Considering its fundamental role in sustaining life on the earth, it is important to identify the level of diversity present in the chloroplast genome, what genes and genomic content have been lost, what genes have been transferred to the nuclear genome, duplication events, and the overall origin and evolution of the chloroplast genome. Our analysis of 2511 chloroplast genomes indicated that the genome size and number of coding DNA sequences (CDS) in the chloroplasts genome of algae are higher relative to other lineages. Approximately 10.31% of the examined species have lost the inverted repeats (IR) in the chloroplast genome that span across all the lineages. Genome-wide analyses revealed the loss of the Rbcl gene in parasitic and heterotrophic plants occurred approximately 56 Ma ago. PsaM, Psb30, ChlB, ChlL, ChlN, and Rpl21 were found to be characteristic signature genes of the chloroplast genome of algae, bryophytes, pteridophytes, and gymnosperms; however, none of these genes were found in the angiosperm or magnoliid lineage which appeared to have lost them approximately 203–156 Ma ago. A variety of chloroplast-encoded genes were lost across different species lineages throughout the evolutionary process. The Rpl20 gene, however, was found to be the most stable and intact gene in the chloroplast genome and was not lost in any of the analyzed species, suggesting that it is a signature gene of the plastome. Our evolutionary analysis indicated that chloroplast genomes evolved from multiple common ancestors ~1293 Ma ago and have undergone vivid recombination events across different taxonomic lineages.

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Section: Introductionmentioning

confidence: 99%

Gene Loss and Evolution of the Plastome

Mohanta

Mishra

Khan

et al. 2020

Genes

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“…The same is true for the members of the graminid clade with plurilocular gynoecia (Flagellariaceae, Joinvilleaceae, Ecdeiocoleaceae: [88,89]. These data may be interpreted as supporting placement of Eriocaulaceae as sister to restiids + graminids in the situation of still insufficient molecular evidence of relationships of the family [18,19].…”

Section: Discussionmentioning

confidence: 68%

“…Gynoecium development indicates similarities of Eriocaulaceae with restiids and graminids rather than with Xyridaceae. This observation is significant, because Eriocaulaceae and Xyridaceae are among relatively few monocot families with controversial placement in molecular phylogenetic studies [18,19].…”

Section: Resultsmentioning

confidence: 99%

“…Surrounded by sterile involucral bracts, they resemble capitula of Asteraceae and some other specialized eudicots [11,[14][15][16]. Similar compact inflorescences are found in another family of the order Poales, Xyridaceae, which may (or may not) be sister to Eriocaulaceae [17][18][19], but orientation of trimerous flowers follows the typical monocot pattern in Xyridaceae [11,20]. Although being tiny and uniformly colored, the perianth of Eriocaulaceae is believed to be differentiated into a calyx and a corolla.…”

Section: Introductionmentioning

confidence: 95%

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Stability Despite Reduction: Flower Structure, Patterns of Receptacle Elongation and Organ Fusion in Eriocaulon (Eriocaulaceae: Poales)

Sokoloff

Yadav

Chandore³

et al. 2020

Plants

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Eriocaulaceae (Poales) differ from potentially related Xyridaceae in pattern of floral organ arrangement relative to subtending bract (with median sepal adaxial). Some Eriocaulaceae possess reduced and non-trimerous perianth, but developmental data are insufficient. We conducted a SEM investigation of flower development in three species of Eriocaulon to understand whether organ number and arrangement are stable in E. redactum, a species with a highly reduced calyx and reportedly missing corolla. Early flower development is similar in all three species. Male and female flowers are indistinguishable at early stages. Despite earlier reports, both floral types uniformly possess three congenitally united sepals and three petals in E. redactum. Petals and inner stamens develop from common primordia. We assume that scanning electron microscopy should be used in taxonomic accounts of Eriocaulon to assess organ number and arrangement. Two types of corolla reduction are found in Eriocaulaceae: suppression and complete loss of petals. Common petal–stamen primordia in Eriocaulon do not co-occur with delayed receptacle expansion as in other monocots but are associated with retarded petal growth. The ‘reverse’ flower orientation of Eriocaulon is probably due to strictly transversal lateral sepals. Gynoecium development indicates similarities of Eriocaulaceae with restiids and graminids rather than with Xyridaceae.

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“…Then, an Illumina HiSeq 4000 platform at Novogene (http://www.novogene.com, China) was applied to perform 2 Â 150 bp pair-end sequencing. Clean reads were mapped to published chloroplast genome of Eriocaulon as references (Darshetkar et al 2019) using Map function of Geneious R11 (Kearse et al 2012). Filtered reads were then used for de novo assembly with Geneious R11.…”

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confidence: 99%

The complete chloroplast genome sequence of Eriocaulon nepalense (Eriocaulaceae)

Deng

Zhang

2019

Mitochondrial DNA Part B

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The complete chloroplast (cp) genome sequence of Eriocaulon nepalense was sequenced and assembled in this study. The cp genome of E. nepalense is 150947 bp in length, composed of a pair of 26451 bp inverted repeat regions (IRs), separated by a large single-copy region (LSC) of 81064 bp, and a small single-copy region (SSC) of 16981 bp. The cp genome contained 114 unique genes, including 80 protein-coding genes, 30 tRNA genes, and 4 ribosomal RNA genes. The phylogenetic position of E. nepalense based on the cp genome data is closer to E. decemflorum than E. buergerianum. ARTICLE HISTORY

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Understanding evolution in Poales: Insights from Eriocaulaceae plastome

Cited by 22 publications

References 51 publications

Gene Loss and Evolution of the Plastome

Gene Loss and Evolution of the Plastome

Stability Despite Reduction: Flower Structure, Patterns of Receptacle Elongation and Organ Fusion in Eriocaulon (Eriocaulaceae: Poales)

The complete chloroplast genome sequence of Eriocaulon nepalense (Eriocaulaceae)

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