The taxonomy of Parthenium section Partheniastrum DC. (Asteraceae-Ambrosiinae)

Mears, James A.

doi:10.5962/bhl.part.12127

Cited by 6 publications

(16 citation statements)

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“…The assigned ploidy number is based on flow cytometry estimates from a larger sample for each accession (Table A.4). Ploidy level for the P. integrifolium sample was assigned based on chromosome counts and literature (Mears, 1975 Rollins based on morphological characteristics, but the phylogenetic placement of R1110 in clade A rather than the clade containing artificial hybrids between guayule and P. tomentosum var. stramonium (clade D, below) does not support this particular hybrid classification.…”

Section: Genomic Characterization Of Guayule Germplasmmentioning

confidence: 99%

“…B.5, see Supplementary data) suggests a broader climatic tolerance than guayule. Wild quinine is a perennial herbaceous plant native to central and eastern United States (Mears, 1975;Rollins, 1950) and a potential source of cold resistance and non-arid adaptation (Thompson and Ray, 1989). However, with the exception of a recent ploidy and nuclear genome size evaluation of mariola accessions (Sanchez et al, 2014), minimal genomic information is available for these two Parthenium species, and the availability of this information is expected to greatly facilitate interspecific breeding programs.…”

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confidence: 98%

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Genomic diversity and phylogenetic relationships in the genus Parthenium (Asteraceae)

Ilut

Sanchez

Costich

et al. 2015

Industrial Crops and Products

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a b s t r a c tGuayule (Parthenium argentatum A. Gray) is a perennial woody shrub native to the North American Chihuahuan Desert that holds promise as a sustainable source of natural rubber and hypoallergenic latex. The improvement of guayule for commercial-scale production could be accelerated through genomicsassisted breeding, but such a strategy is severely limited by the paucity of available genomic tools and well-characterized genetic resources. To that end, we used genotyping-by-sequencing (GBS) to simultaneously identify and genotype tens of thousands of single-nucleotide polymorphism (SNP) markers across 62 plant samples from seven wild and cultivated guayule, three Parthenium interspecific hybrid, four mariola (Parthenium incanum Kunth), and one wild quinine (Parthenium integrifolium L.) accession(s) that have been characterized for ploidy level and nuclear genome size in this and a prior study. Phylogenetic analysis using the SNP data identified at least two distinct sources of guayule breeding material in the cultivated accessions, previously unknown multi-species hybrids within two Parthenium hybrid cultivars, and guayule/mariola hybrids within one guayule and one mariola wild collected accession. Similar to previously reported results for guayule and mariola, we observed aneuploidy and multiple ploidy levels among individual plants (mixed ploidy) within three Parthenium interspecific hybrid accessions newly characterized in this study. Nuclear genome size characterization of wild quinine, a first for this species, found an estimated haploid nuclear genome size (5757 Mb) for the tetraploid (2n = 4x = 72) accession that was more than 1.5-fold larger than that of tetraploid (2n = 4x = 72) guayule or mariola. Together, these results further underscore the need for a comprehensive characterization of available guayule germplasm and sister taxa with both SNP markers and flow cytometry, illustrate the novel utility of GBS for the genus Parthenium, and lay the foundation for genomics-assisted breeding in guayule.

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Section: Genomic Characterization Of Guayule Germplasmmentioning

confidence: 99%

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confidence: 98%

Genomic diversity and phylogenetic relationships in the genus Parthenium (Asteraceae)

Ilut

Sanchez

Costich

et al. 2015

Industrial Crops and Products

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“…hispidum and P. integrifolium, constitute the section Partheniastrum DC in Rollins' (1950) classification. Mears (1975) followed Cronquist's (1945) classification that placed the above taxa in P. integrifolium. Thus, P. hispidum var.…”

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confidence: 99%

“…Polyploids were also suspected among individuals of the above taxon as determined by pollen size (Mears, 1975). Rodriguez (1975) reported that P. hispidum var.…”

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confidence: 99%

“…auriculatum were grown from tuberous roots collected from a population in Prince Edward County, 14 km east of Appomattox, Virginia. Identification of mature plants is based on comparisons of their morphological characteristics with descriptions by Rollins (1950) and Mears (1975). Diploid guayule plants were raised from seeds obtained from the National Seed Storage Laboratory, Fort Collins, Colorado.…”

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Relationship of Woody Parthenium Argentatum and Herbaceous P. Hispidum Var. Auriculatum (Asteraceae)

Hashemi

Estilai

West

et al. 1987

American J of Botany

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Interspecific hybrids between woody Parthenium argentatum Gray (guayule), native to Mexico and Southwest Texas, and herbaceous perennial P. hispidum var. auriculatum (Britton) Rollins, native to the United States, were obtained successfully. The F1 hybrids were intermediate for most morphological characters with the exception of the short woody stem, yellow pollen color, and the trichome morphology. Chromosome counts revealed the presence of 2n = 36 A‐chromosomes in P. argentatum. The same number of A‐chromosomes and four B‐chromosomes were found in P. hispidum var. auriculatum. Observations of pollen mother cells showed regular meiosis in both parental species. At diakinesis, chiasmata averaged 1.12 and 1.24 per bivalent for P. argentatum and P. hispidum var. auriculatum, respectively. Meiotic behavior of the F1 hybrids was irregular. F1 hybrids averaged 4.43 univalents at metaphase I, 1.95 laggards at anaphase I, and 1.62 micronuclei at the tetrad stage. The low pollen stainability (5.1%) in the F1 hybrids and the limited number of viable BC1 seeds (4.07%) may be reflections of the irregular meiosis. Although these primary hybrids are partially fertile, they can be used to introduce desirable characteristics of P. hispidum var. auriculatum, such as herbaceous perennial habit, regrowth ability, and cold tolerance into guayule.

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Chemistry of Polyploids: A Summary with Comments on Parthenium (Asteraceae-Ambrosiinae)

Mears¹

1980

Polyploidy

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The taxonomy of Parthenium section Partheniastrum DC. (Asteraceae-Ambrosiinae)

Cited by 6 publications

References 0 publications

Genomic diversity and phylogenetic relationships in the genus Parthenium (Asteraceae)

Genomic diversity and phylogenetic relationships in the genus Parthenium (Asteraceae)

Relationship of Woody Parthenium Argentatum and Herbaceous P. Hispidum Var. Auriculatum (Asteraceae)

Chemistry of Polyploids: A Summary with Comments on Parthenium (Asteraceae-Ambrosiinae)

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