On the distribution of the genusCousinia (Compositae)

Knapp, Hans Dieter

doi:10.1007/bf00936283

Cited by 32 publications

(26 citation statements)

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“…400 species) or Jurinea (approx. 200 species) (Knapp 1987, Bremer 1994. The most frequent chromosome number within the genus Cirsium is 2nϭ34 (reported for approx.…”

Section: Resultsmentioning

confidence: 99%

Comparative Study of Chromosome Morphology in Silybum marianum

2008

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Summary Karyotype and morphology of mitotic chromosomes in four populations of medicinal plant Silybum marianum collected from various geographical locations of Iran and two cultivars of this species were studied. Chromosome characteristics were measured from 10 complete metaphase cells using Micromeasure software. Results showed that S. marianum is a diploid species with 2nϭ2xϭ34 chromosomes. The karyotype consisted of six pairs of metacentric, ten pairs of submetacentric, and one pairs of acrocentric chromosomes. One of the chromosomes (chromosome 1) had a secondary constriction on centromeric region of its short arm. Karyological characteristics of all materials studied were similar to each other, however, among different genotypes some variations were observed on chromosome arm ratios and relative lengths. According to Stebbin's asymmetry index, S. marianum is placed at 2B category.

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“…400 species) or Jurinea (approx. 200 species) (Knapp 1987, Bremer 1994. The most frequent chromosome number within the genus Cirsium is 2nϭ34 (reported for approx.…”

Section: Resultsmentioning

confidence: 99%

Comparative Study of Chromosome Morphology in Silybum marianum

2008

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“…It contains 600 to 700 species in Southwest and Central Asia. The distribution area of Cousinia is nearly identical with the Irano-Turanian region (Knapp 1987). In Iran, after Astragalus, Cousinia is the largest genus with over than 270 species and 43 sections.…”

Section: Introductionmentioning

confidence: 94%

Genetic and morphological diversity in Cousinia cylindracea (Asteraceae) populations: Identification of gene pools

2015

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Abstract. Minaeifar AA, Sheidai M, Attar F. 2015. Genetic and morphological diversity in Cousinia cylindracea (Asteraceae) populations: Identification of gene pools. . Cousinia is one of the largest genera in the Asteraceae family. It contains 600 to 700 species distributed in Southwest and Central Asia. In Iran with 270 species it is the largest genus after Astragalus,. Cousinia probably is unique in the degree of diversification of all its parts and high numbers of species in restricted area. In this investigation 90 plant specimens of 10 geographical populations of Cousinia cylindracea Boiss. were studied from morphological and genetic (ISSR) points of view. Both intra and inter-population morphological and genetic variability was observed in the studied populations. ANOVA and CVA tests revealed significant morphological difference among these populations. Similarly, AMOVA tests revealed significant molecular difference among geographical populations. Mantel test produced significant positive correlation between genetic distance and geographical distance of the studied populations. Networking, STRUCTURE analysis and population assignment test revealed low degree of gene flow among these populations. The results identified two different gene pools of C. Cylindracea in Iran, supporting Rechinger suggestion that C. cylindracea might have two varieties in Iran.

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“…In a synthetic analysis of the species diversity distribution of Cousinia, a typical Irano-Turanian giant taxon, Knapp (1987) shows that the highest diversity is concentrated in areas with highest topographic heterogeneity. The role of topographic setting in speciation has, so far, received little attention by phytogeographers (Coblentz and Riitters, 2004;Qi and Yang, 1999).…”

Section: Climatic Versus Topographic Determinism Of the Irano-turaniamentioning

confidence: 99%