Legumes of the United States. IV. Mimosa

Isely, Duane

doi:10.2307/2423765

Cited by 19 publications

(15 citation statements)

References 6 publications

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“…On the other hand, it appear to be no relationship between ploidy level and growth habit, since most of the ploidy levels were found both in herbs and shrubs. All the species analyzed in the present report have chromosome numbers multiple of x =13, which has been previously proposed as the basic chromosome number for the genus (Isely 1971, Lewis and Elias 1981, Goldblatt 1981, Seijo 1993. Considering x=7 as the ancestral basic number for legumes, the diploid chromosome number 2n =26 may be a paleotetraploid and x=13 may be a derived basic chromosome number originated from an aneuploid reduction of 2n =4x=28 (Goldblatt 1981).…”

Section: Resultsmentioning

confidence: 56%

Chromosome Numbers of Some Southernmost Species of Mimosa L. (Leguminosae).

Seiio

Fernández

2001

CYTOLOGIA

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Summary Chromosome numbers of 9 species of Mimosa which grow in the southern limit of the South American centre of diversification were determined, all of them are new reports except the one of M. oligophylla. M. vellosiella, M. oligophylla and M. flagellaris were diploids with 2n=2x=26; M. velloziana and M. adpressa were tetraploids with 2n =4x= 52; M. sprengelii, M rarnulosa and M. rocae were octoploids with 2n -8x=104; and one accession of M. balansae was diploid while the other was tetraploid. All of them were multiples of the basic chromosome number x=13. The polyploid species were more frequent at higher latitudes, this increment was also accompanied with a higher ploidy level of the polyploids southernward. All the polyploids found belong to the sections with most advanced characters of the genus, which supports the phylogeny proposed for Mimosa by Barneby. Data suggest that the extension of the genus toward the temperate zones might have be done mainly by polyploid species, which may have had advantages over the diploids in colonising habitats restricted to the latter.

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Section: Resultsmentioning

confidence: 56%

Chromosome Numbers of Some Southernmost Species of Mimosa L. (Leguminosae).

Seiio

Fernández

2001

CYTOLOGIA

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“…In the genus Mimosa, cytogenetic studies have been done mainly using conventional staining (Isely 1971;Lewis and Elias 1981;Goldblatt 1981;Seijo 1993Seijo , 1999Seijo , 2000Seijo and Fernández 2001;Morales et al 2007Morales et al , 2010Morales et al , 2011Dahmer et al 2011). In spite of the great number of papers published about the genus, the small size of the chromosomes within Fabaceae family (Biondo et al 2005) has hindered elucidation of the morphological features of the chromosomes (Morales et al 2010).…”

Section: Discussionmentioning

confidence: 99%

Polyploidy, B chromosomes, and heterochromatin characterization of Mimosa caesalpiniifolia Benth. (Fabaceae-Mimosoideae)

Sousa

Reis

Viccini

2012

Tree Genetics & Genomes

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Eight populations of Mimosa caesalpiniifoliaBenth. were investigated using a cytogenetic approach. Here, we describe for the first time details of the karyotype including chromosome morphology, physical mapping of chromomycin A3 (CMA) 4′,6-diamidino-2-phenylindole (DAPI) and silver staining of nucleolar organizer regions (Ag-NOR banding), as well as 45S rDNA sites. All populations studied showed karyotypes with 2n02x026 small metacentric and submetacentric chromosomes, although some individuals exhibited 2n04x052 chromosomes. Moreover, we observed putative additional B chromosomes in some populations. The CMA banding and fluorescent in situ hybridization techniques revealed NOR heteromorphism on the unique pair containing 45 rDNA site (chromosome 12) while the Ag-NOR banding indicated NORs on both cytotypes. Up to two and four nucleoli were observed, respectively, on individuals with 2n02x026 and 2n04x052 chromosomes and the differences in nucleolar size seems to be directly related to NOR heteromorphism in some individuals. The data present new and important information to understand karyotypic evolution of Mimosa and Fabaceae.

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“…(velvet mesquite) and Acacia greggii A. Gray (catclaw acacia) are members of the Fabaceae and native to the Sonoran Desert of northern Mexico and southwestern USA [29], [30]. They are long-lived shrubs with arborescent growth potential [6].…”

Section: Methodsmentioning

confidence: 99%

Seedling Responses to Water Pulses in Shrubs with Contrasting Histories of Grassland Encroachment

2014

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Woody plant encroachment into grasslands has occurred worldwide, but it is unclear why some tree and shrub species have been markedly more successful than others. For example, Prosopis velutina has proliferated in many grasslands of the Sonoran Desert in North America over the past century, while other shrub species with similar growth form and life history, such as Acacia greggii, have not. We conducted a glasshouse experiment to assess whether differences in early seedling development could help explain why one species and not the other came to dominate many Sonoran Desert grasslands. We established eight watering treatments mimicking a range of natural precipitation patterns and harvested seedlings 16 or 17 days after germination. A. greggii had nearly 7 times more seed mass than P. velutina, but P. velutina emerged earlier (by 3.0±0.3 d) and grew faster (by 8.7±0.5 mg d−1). Shoot mass at harvest was higher in A. greggii (99±6 mg seedling−1) than in P. velutina (74±2 mg seedling−1), but there was no significant difference in root mass (54±3 and 49±2 mg seedling−1, respectively). Taproot elongation was differentially sensitive to water supply: under the highest initial watering pulse, taproots were 52±19 mm longer in P. velutina than in A. greggii. Enhanced taproot elongation under favorable rainfall conditions could give nascent P. velutina seedlings growth and survivorship advantages by helping reduce competition with grasses and maintain contact with soil water during drought. Conversely, A. greggii's greater investment in mass per seed appeared to provide little return in early seedling growth. We suggest that such differences in recruitment traits and their sensitivities to environmental conditions may help explain ecological differences between species that are highly similar as adults and help identify pivotal drivers of shrub encroachment into grasslands.

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Legumes of the United States. IV. Mimosa

Cited by 19 publications

References 6 publications

Chromosome Numbers of Some Southernmost Species of Mimosa L. (Leguminosae).

Chromosome Numbers of Some Southernmost Species of Mimosa L. (Leguminosae).

Polyploidy, B chromosomes, and heterochromatin characterization of Mimosa caesalpiniifolia Benth. (Fabaceae-Mimosoideae)

Seedling Responses to Water Pulses in Shrubs with Contrasting Histories of Grassland Encroachment

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