Karyosystematische Untersuchungen anRubiaceae: Chromosomenz�hlungen aus Afrika, Madagaskar und Mauritius

Kiehn, Michael

doi:10.1007/bf00984156

Cited by 20 publications

(37 citation statements)

References 22 publications

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“…Karyotypic analysis -As pointed out by Kiehn (1985), little is known about the chromosomes of tropical and subtropical species of Rubiaceae. The chromosome numbers presented here (Table 2) agree with those reported in the literature and generally with the basic number (x = 11) for this family (Darlington and Wylie 1955).…”

Section: Discussionmentioning

confidence: 99%

“…The chromosome number of 2n = 20 for Coccocypselum lanceolatum (tribe Coccocypseleae) differed from the basic number of the family, but has also been reported for other species of the genus, including C. brevipetiolatum and C. decumbens (Kiehn 1985). Other numbers found in species of the this genus include 2n = 10-12 in C. herbaceum, 2n = 20-40 in C. hirsutum and 2n = 38-40 in C. lumbellatum (Kiehn 1985).…”

mentioning

confidence: 86%

“…Other numbers found in species of the this genus include 2n = 10-12 in C. herbaceum, 2n = 20-40 in C. hirsutum and 2n = 38-40 in C. lumbellatum (Kiehn 1985).…”

mentioning

confidence: 94%

“…Most studies have dealt with Coffea (Krug 1934;Pinto-Maglio and Cruz 1988) and it has been suggested that the basic number for the family is x = 11 (Kiehn 1985).…”

Section: Introductionmentioning

confidence: 99%

“…2n = 88 and 2n = 132 in Psychotria orophila and P. mahonii, respectively (Kiehn 1985), and 2n = 110 + 1 in Hydnophytum moseleyanum (Robbrecht 1996).…”

mentioning

confidence: 99%

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Chromosomal studies of species of Rubiaceae (A. L. de Jussieu) from the Brazilian cerrado

Corrêa

Forni‐Martins

2004

Caryologia

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-The chromosomes of 14 species belonging to two subfamilies of the family Rubiaceae collected in the Brazilian cerrado were studied. In the subfamily Ixoroideae, five species (Alibertia concolor, A. edulis, A. sessilis, Genipa americana and Tocoyena formosa) had a chromosome number of 2n = 22 and one (Amaioua intermedia) showed polyploidy, with 2n = 66. All of the chromosome numbers were multiples of the more common basic number for this family (x = 11). In the subfamily Rubioideae, variations in the number of chromosomes were observed among tribes and genera, with 2n = 20 in the tribe Coccocypseleae (Coccocypselum lanceolatum), 2n = 28 in Spermacoceae (Borreria latifolia, B. verticillata and Richardia brasiliensis) and n = 11 in Coussareeae (Coussarea hydrangeifolia). In the tribe Psychotrieae, the variations included n = 11 (Palicourea rigida), 2n = 22 (Psychotria hoffmannseggiana) and 2n = 32 (Psychotria deflexa). The ideograms elaborated for 12 species were symmetrical (TF% varied from 47.45 to 38.01). The size of the chromosomes ranged from 1.26 to 7.33 µm and most were metacentric. The results show that chromosome size and morphology were insufficient to differentiate among groups within the Rubiaceae.

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 86%

“…Other numbers found in species of the this genus include 2n = 10-12 in C. herbaceum, 2n = 20-40 in C. hirsutum and 2n = 38-40 in C. lumbellatum (Kiehn 1985).…”

mentioning

confidence: 94%

“…Most studies have dealt with Coffea (Krug 1934;Pinto-Maglio and Cruz 1988) and it has been suggested that the basic number for the family is x = 11 (Kiehn 1985).…”

Section: Introductionmentioning

confidence: 99%

“…2n = 88 and 2n = 132 in Psychotria orophila and P. mahonii, respectively (Kiehn 1985), and 2n = 110 + 1 in Hydnophytum moseleyanum (Robbrecht 1996).…”

mentioning

confidence: 99%

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Chromosomal studies of species of Rubiaceae (A. L. de Jussieu) from the Brazilian cerrado

Corrêa

Forni‐Martins

2004

Caryologia

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Combined and Separate Analyses of Morphological and Molecular Data in the Plant Family Rubiaceae

Bremer

1996

Cladistics

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The Rubiaceae are one of the largest of the families of angiosperms, with over 10 000 species. The tribal and subfamilial classification is provisional due to the lack of phylogenetic hypotheses. The present study of the Rubiaceae is based on 33 genera and three data sets, one morphological and two molecular from chloroplast DNA, restriction sites and rbcL sequences. There is much congruence between the morphological and the molecular data sets, but also conflict. For parsimony reasons, the best phylogenetic hypothesis is a tree based on an analysis of the combined data sets. The so-called "total evidence" criterion for the combined analysis is simply a reiteration of the principle of parsimony. In this particular study, the classification would be almost the same even if based on the separate analyses instead of the combined. Despite the inapplicability of consensus trees or trees from separate analyses for phylogenetic hypotheses and classification, separate analyses may provide important information. It is the best way to reveal conflicts between different data sets. Knowledge of the conflicts can promote further detailed investigation in order to improve understanding of characters and phylogenetic hypotheses. In this study, the tribe Vanguerieae provides such an example; morphological data support a position in the subfamily Cinchonoideae, but DNA and a tree based on the combined data support a position in subfamily Ixoroideae. The tribe's position in the morphological tree is probably due to missing information concerning the correct pollen presentation system. Bootstrap fractions and K. Bremer's branch support values are used to evaluate the stability of particular nodes in the trees. Interestingly these values are not always correlated, e.g. in the morphological tree, the node with the highest branch support value has very low bootstrap fraction. The reasons for these differences are unclear, but large differences are presumably more likely to occur on short branches.

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Karyosystematic studies onRubiaceae: Chromosome counts from Sri Lanka

Kiehn

1986

Pl Syst Evol

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Karyosystematische Untersuchungen anRubiaceae: Chromosomenz�hlungen aus Afrika, Madagaskar und Mauritius

Cited by 20 publications

References 22 publications

Chromosomal studies of species of Rubiaceae (A. L. de Jussieu) from the Brazilian cerrado

Chromosomal studies of species of Rubiaceae (A. L. de Jussieu) from the Brazilian cerrado

Combined and Separate Analyses of Morphological and Molecular Data in the Plant Family Rubiaceae

Karyosystematic studies onRubiaceae: Chromosome counts from Sri Lanka

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