Neglected features of probable taxonomic value in Podostemaceae: The case of Polypleurum

Jäger-Zürn, Irmgard

doi:10.1016/j.flora.2010.01.008

Cited by 5 publications

(3 citation statements)

References 38 publications

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“…Riverweeds (as members of this family are also called) are notable for living attached to rocks in fast-flowing water habitats such as river rapids and waterfalls, with flowers that project above the water surface and fruits that develop and shed seeds only in the dry season when the water level is low (van Royen, 1951; Philbrick and Novelo, 1995; Rutishauser, 1995; Rutishauser, 1997; Philbrick and Novelo, 1998). Much remains to be explored in Podostemaceae despite a number of morphological (van Royen, 1951; Novelo and Philbrick, 1997; Rutishauser et al, 1999; Jäger-Zürn, 2011), developmental (Rutishauser, 1995; Rutishauser, 1997; Jäger-Zürn, 2005, Jäger-Zürn, 2007), and karyological (Oropeza et al, 1998; Oropeza et al, 2002) studies followed by phylogenetic and biogeographical investigations (Kita and Kato, 2001; Ruhfel et al, 2011; Tippery et al, 2011; Koi et al, 2012; Ruhfel et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Plastid Genomes of Five Species of Riverweeds (Podostemaceae): Structural Organization and Comparative Analysis in Malpighiales

et al. 2019

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With the advent of next-generation sequencing technologies, whole-plastome data can be obtained as a byproduct of low-coverage sequencing of the plant genomic DNA. This provides an opportunity to study plastid evolution across groups, as well as testing phylogenetic relationships among taxa. Within the order Malpighiales (∼16,000 spp.), the Podostemaceae (∼300 spp.) stand out for their unique habit, living attached to rocks in fast-flowing aquatic habitats, and displaying highly modified morphologies that confound our understanding of their classification, biology, and evolution. In this study, we used genome skimming data to assemble the full plastid genome of 5 species within Podostemaceae. We analyzed our data in a comparative framework within Malpighiales to determine the structure, gene content, and rearrangements in the plastomes of the family. The Podostemaceae have one of the smallest plastid genomes reported so far for the Malpighiales, possibly due to variation in length of inverted repeat (IR) regions, gene loss, and intergenic region variation. We also detected a major inversion in the large single-copy region unique to the family. The uncommon loss or pseudogenization of ycf1 and ycf2 in angiosperms and in land plants in general is also found to be characteristic of Podostemaceae, but the compensatory mechanisms and implications of this and of the pseudogenization of accD , rpl22 , and clpP and loss of rps16 remain to be explained in this group. In addition, we estimated a phylogenetic tree among selected species in Malpighiales. Our findings indicate that the Podostemaceae are a distinct lineage with long branches that suggest faster rates of evolution in the plastome of the group, compared with other taxa in the order. This study lays the foundations for future phylogenomic studies in the family.

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Section: Introductionmentioning

confidence: 99%

Plastid Genomes of Five Species of Riverweeds (Podostemaceae): Structural Organization and Comparative Analysis in Malpighiales

et al. 2019

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“…Pteridaceae) (Kealhofer & Piperno 1998;Prychid et al 2003;Sundae 2009). In Podostemaceae the silica can be found occupying the cytoplasm or only in the vacuoles (Jäger-Zürn 2011). Although the presence of silica bodies is well documented in Podostemaceae, they have been poorly investigated in terms of morphology and not utilized taxonomically.…”

Section: Introductionmentioning

confidence: 99%

Silica bodies and their systematic implications at the subfamily level in Podostemaceae

et al. 2011

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Podostemaceae is a family of eudicotyledonous rheophytes with unique morphology, sometimes resembling algae, lichens or bryophytes. This study evaluates the taxonomic value of silica-body morphology (presence, location, size, shape, ornamentation) in species representing the three subfamilies: Tristicha trifaria (Bory ex Willd.) Spreng. (Tristichoideae), Weddellina squamulosa Tul. (Weddellinoideae) and Diamantina lombardii Novelo, C.T.Philbrick & Irgang (Podostemoideae). T. trifaria and D. lombardii have silica bodies in stems and leaves. In contrast, W. squamulosa exhibits silica bodies only in the scale-like leaves. The morphology of these bodies is unique to each species. The results denote the taxonomic usefulness of silica characteristics and a need for a more complete study of silica bodies throughout the family. Key words: aquatic plants, Podostemaceae, silica bodies. ResumoPodostemaceae é uma família eudicotiledônea reófita de morfologia peculiar, lembrando por vezes algas, liquens ou briófitas. O presente estudo avalia o valor taxonômico da morfologia dos corpos silicosos (presença, localização, tamanho, forma e ornamentação) em espécies representantes das três subfamílias: Tristicha trifaria (Bory ex Willd.) Spreng. (Tristichoideae), Weddellina squamulosa Tul. (Weddellinoideae) e Diamantina lombardii Novelo, C.T.Philbrick & Irgang (Podostemoideae). T. trifaria e D. lombardii apresentam corpos silicosos nos caules e nas folhas, enquanto W. squamulosa possui estas estruturas restritas às folhas escamiformes. A diversidade morfológica dos corpos silicosos, específica para cada espécie aqui estudada, comprova o potencial taxonômico deste caráter, até então negligenciado, e aponta para a necessidade de estudos mais abrangentes para essas estruturas em Podostemaceae. Palavras-chave: corpos silicosos, plantas aquáticas, Podostemaceae.

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“…Floral ontogeny studies in Rubiaceae are scarce; the studies by Svoma (1991), Decraene & Smets (2000), Groeninckx et al (2007), andMariath (2008;2011) stand out. They are essential for interpreting morphological characteristics of the gynoecium, such as variability in the development of the carpellary septa, type of placentation and integument development, in addition to providing evolutionary evidence that clarifies taxonomic relationships.…”

Section: Discussionmentioning

confidence: 99%

Development of carpels and ovules in Dialypetalanthus fuscescens Kuhlm. (Rubiaceae): an enigmatic taxon

et al. 2017

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Dialypetalanthus is a monospecifi c genus that occurs in the Amazon Basin of Brazil, Bolivia and Peru and occupies a controversial position among the Rubiaceae. We continue this taxonomic discussion with the overall aim of clarifying the systematic position of D. fuscescens within the Rubiaceae. To accomplish this, we analyzed the ontogeny of its gynoecium, in particular the fl oral meristem, as well as the development of the carpels and cauline placentation. Gynosporogenesis and the diff erentiation of the carpellary septa and ovules were also described. Dialypetalanthus fuscescens was classifi ed according to evolutionary diagrams found in the literature. Th e following characteristics were observed in D. fuscescens: 1) permanence of the fl oral meristem in the central basal part of the early fl ower bud; 2) dual origin of carpellary septum; 3) trizonate ovular primordia with only one fertile gynospore per ovule; and 4) cellular proliferation in the chalazal region. Embryological results confi rm the classifi cation of D. fuscescens in the subfamily Ixoroideae. Th ese results are distinct from any others previously proposed in the evolutionary diagram. Th erefore, we conclude that this study has presented evidence strongly suggesting that Dialypetalanthus possesses new morphological-type of ovule we refer to as the Dialypetalanthus-type.

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Neglected features of probable taxonomic value in Podostemaceae: The case of Polypleurum

Cited by 5 publications

References 38 publications

Plastid Genomes of Five Species of Riverweeds (Podostemaceae): Structural Organization and Comparative Analysis in Malpighiales

Plastid Genomes of Five Species of Riverweeds (Podostemaceae): Structural Organization and Comparative Analysis in Malpighiales

Silica bodies and their systematic implications at the subfamily level in Podostemaceae

Development of carpels and ovules in Dialypetalanthus fuscescens Kuhlm. (Rubiaceae): an enigmatic taxon

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