More Problems Despite Bigger Flowers: Systematics of &lt;I&gt;Cuscuta tinctoria&lt;/I&gt; Clade (subgenus &lt;I&gt;Grammica&lt;/I&gt;, Convolvulaceae) with Description of Six New Species

Costea, Mihai; Ruiz, Ignacio García; Dockstader, Kristy; Stefanović, Saša

doi:10.1600/036364413x674887

Cited by 14 publications

(12 citation statements)

References 38 publications

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“…This is the most comprehensive study of Cuscuta seeds to date, examining for the first time 80 species and filling either morphological or anatomical knowledge gaps for the 21 previously PLOS ONE studied species (S1 Table). Our findings largely confirmed previous studies (S1 Table), as well as earlier taxonomic revisions in which seeds were superficially described (mostly in terms of size and sometimes shape [e.g., 16,17,50,51,[54][55][56][57][58][59][60][61][62][63][64]). Despite the significant increase of the taxon sampling and the fine level of morphological and anatomical detail employed, only a few additional features with systematic value were discovered.…”

Section: Potential Use Of Seed Characters For Systematics and Identifsupporting

confidence: 91%

Cuscuta seeds: Diversity and evolution, value for systematics/identification and exploration of allometric relationships

et al. 2020

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Cuscuta (dodders) is a group of parasitic plants with tremendous economic and ecological significance. Their seeds are often described as "simple" or "unspecialized" because they do not exhibit any classical dispersal syndrome traits. Previous studies of seed morphology and/or anatomy were conducted on relatively few species. We expanded research to 101 species; reconstructed ancestral character states; investigated correlations among seed characters and explored allometric relationships with breeding systems, the size of geographical distribution of species in North America, as well as the survival of seedlings. Seed morphological and anatomical characters permit the separation of subgenera, but not of sections. Identification of Cuscuta species using seed characteristics is difficult but not impossible if their geographical origin is known. Seeds of subg. Monogynella species, exhibit the likely ancestral epidermis type consisting of elongated and interlocked cells, which are morphologically invariant, uninfluenced by dryness/wetness. Subgenera Cuscuta, Pachystigma and Grammica have evolved a seed epidermis with isodiametric cells that can alternate their morphology between two states: pitted when seeds are dry, and papillose after seed imbibition. A seed coat with double palisade architecture throughout the entire seed has also apparently evolved in subgenera Cuscuta, Pachystigma and Grammica, but several species in two clades of the latter subgenus reverted to a single palisade layer outside the hilum area. The same latter species also evolved a peculiar, globose embryo, likely having a storage role, in contrast to the ancestral filiform and coiled embryo present throughout the remainder of the genus. Autogamous species had on average the highest number of seeds per capsule, whereas fully xenogamous taxa had the lowest. No correlation was revealed between the size of the seeds and the size of their geographical distribution in North America, but seedlings of species with larger seeds survived significantly longer than seedlings resulted from smaller seeds. Diversity and evolution of seed traits was discussed in relationship with their putative roles in dormancy, germination and dispersal.

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Section: Potential Use Of Seed Characters For Systematics and Identifsupporting

confidence: 91%

Cuscuta seeds: Diversity and evolution, value for systematics/identification and exploration of allometric relationships

et al. 2020

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“…and C. victoriana Yunck. to Australia ( Costea et al, 2013 ); C. kilimanjari Oliv. to eastern Africa; C. hyalina Roth.…”

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confidence: 99%

Waterfowl endozoochory: An overlooked long‐distance dispersal mode for Cuscuta (dodder)

Costea

Stefanović

García

et al. 2016

American J of Botany

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“…To date, nine out of the 15 clades resolved by Stefanović et al (2007) have been examined in detail. Six of these studies mostly comprise species from the territory covered by the Flora of North America ( Costea et al, 2005 ;Costea et al, 2006a , b , c ;Costea and Stefanović, 2009b ;Costea et al, 2009 ) and fi ve include predominantly Mexican dodders Costea and Stefanovic, 2010;Costea et al, 2011 a , b ;Costea et al, 2013 ). In these papers, more precise phylogenetic relationships among species were recovered based on a more exhaustive sampling and analyses of additional sequences from rbcL and the nuclear large-subunit ribosomal DNA (nrLSU).…”

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confidence: 99%

Phylogeny, character evolution, and biogeography of Cuscuta (dodders; Convolvulaceae) inferred from coding plastid and nuclear sequences

García

Costea

Kuzmina

et al. 2014

American J of Botany

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Hybridization may play an important yet underestimated role in the evolution of Cuscuta. Our results disagree with scenarios of evolution (polarity) previously proposed for several taxonomically important morphological characters, and with their usage and significance. While several cases of long-distance dispersal are inferred, vicariance or dispersal to adjacent areas emerges as the dominant biogeographical pattern.

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More Problems Despite Bigger Flowers: Systematics of <I>Cuscuta tinctoria</I> Clade (subgenus <I>Grammica</I>, Convolvulaceae) with Description of Six New Species

Cited by 14 publications

References 38 publications

Cuscuta seeds: Diversity and evolution, value for systematics/identification and exploration of allometric relationships

Cuscuta seeds: Diversity and evolution, value for systematics/identification and exploration of allometric relationships

Waterfowl endozoochory: An overlooked long‐distance dispersal mode for Cuscuta (dodder)

Phylogeny, character evolution, and biogeography of Cuscuta (dodders; Convolvulaceae) inferred from coding plastid and nuclear sequences

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