Topic
Tetrameranthus
About: Tetrameranthus is a research topic. Over the lifetime, 11 publications have been published within this topic receiving 166 citations.
Papers
TL;DR: Three main types of floral development inAnnonaceae are proposed, the most elaborated one found in the fly pollinated genusPseuduvaria, and various morphological characters which point to a close alliance with the Australian endemic genera Fitzalania andHaplostichanthus and the American genus pairSapranthus/Desmopsis.
Abstract: Chromosome counts are presented for 12 genera and 20 species of AustralianAnnonaceae (all diploid with 2n = 16 or 18; Table 1) and two species ofEupomatiaceae (2n = 20, partly from Papua New Guinea). Detailed studies on interphase nuclear structure, condensing behaviour of chromosomes, and fluorochrome and Giemsa C-banding patterns also includeHimantandraceae (Galbulimima) andAustrobaileyaceae. — Eupomatiaceae completely correspond withAnnonaceae karyologically, their base number 2n = 20 is interpreted to have evolved from 2n = 18 by ascending dysploidy from common ancestors.Eupomatia laurina andE. benettii differ in DNA and constitutive heterochromatin (hc) quantity; their evolution from high to low DNA content probably corresponds to general progressions inMagnoliidae. Austrobaileya has nuclei of the presumably primitive “Tetrameranthus type” which is closely related to that ofGalbulimima and several other primitive taxa inMagnoliidae. Karyomorphology and other characters support the maintainance of two main branches within theMagnoliidae, Laurales andMagnoliales, withAustrobaileya probably intermediate; theWinteraceae appear more remote.—InAnnonaceae the reestablishment ofAncana is underlined by its chromosome number (2n = 18) the unexpected and specialized disulcate pollen, and various morphological characters which point to a close alliance with the Australian endemic generaFitzalania andHaplostichanthus (also disulcate) and the American genus pairSapranthus/Desmopsis; they are united in the provisionalSapranthus tribe, with a more distant position toFissistigma s. str. (2n = 16). AustralianAnnonaceae exhibit a high generic and a low species diversity; they can be considered as an ± old and partly impoverished outpost of the family with phytogeographical relationships to Asia, Africa and America.—On the base of field observations three main types of floral development inAnnonaceae are proposed, the most elaborated one found in the fly pollinated genusPseuduvaria. The growth form change from shrubs to lianas during the ontogeny ofDesmos andMelodorum, the vegetative propagation of anAncana species and the ecological and evolutionary patterns of the taxa investigated are discussed.
41 citations
TL;DR: A detailed karyomorphological comparison, including karyotypes, banding patterns, condensing behaviour of chromosomes and structure of interphase nuclei reveals that the closely related generaAnnona andRollinia are almost identical in their diploid genomes, whereas the polyploid ones differ in their heterochromatin (=hc) composition and number of NO-chromosomes.
Abstract: First generic chromosome counts reveal the base number x=7 for the generaTetrameranthus andRollinia. T. umbellatus from the Peruvian Amazon is diploid (2n=14),T. duckei from Brazil (Manaus) is tetraploid (2n=28). In the NeotropicsRollinia (7 species counted) has developed diploid to octoploid taxa (2n=14, 28, 42, 56). Counts of 7 South AmericanAnnona species are presented for comparison (2n=14, 28). The West AfricanCleistopholis patens has 2n=14. The Asian genusMezettia: 2n=14 and the neotropicalGuatteria tribe: 2n=28 are also revised. A detailed karyomorphological comparison, including karyotypes, banding patterns, condensing behaviour of chromosomes and structure of interphase nuclei reveals that the closely related generaAnnona andRollinia are almost identical in their diploid genomes, whereas the polyploid ones differ in their heterochromatin (=hc) composition and number of NO-chromosomes.Cleistopholis, Mezettia and theGuatteria tribe are karyologically and systematically distinct from each other and fromAnnona/Rollinia. Tetrameranthus as compared with the karyomorphology of about 60 other Annonaceous genera has a very peculiar and unusual karyomorphology which underlines its isolated position. Nuclear structures are almost identical in the African genusUvariopsis (2n = 16) and partly similar in theGuatteria tribe; both also share some morphological similarities and possibly are related. From a comparison ofTetrameranthus with several nuclear types within theMagnoliidae, a new model of chromosome evolution in primitive Angiosperms is suggested. In respect to their eco-morphological differentiation the genera investigated differ strongly from each other.
34 citations
1 Jan 1983
TL;DR: Attention is drawn to several recent collections from Bahia, Brazil, which are perhaps referable to Unonopsis stipitata Diels, and some amendments and additions to the revision of Tetrameranthus, including an updated key, are given.
Abstract: This paper follows upon an earlier paper in the series “Studies in Annonaceae” (Maas et al. 1986). Twelve new species are described, viz. 2 in Duguetia, 1 in Ephedranthus, 5 in Guatteria, 2 in Hornschuchia, 1 in Tetrameranthus, and 1 in Unonopsis. A new combination is made in Enicosanthellum. Some amendments and additions to the revision of Tetrameranthus (Westra 1985), including an updated key, are given. Monocarpia euneura Miq. appears to have priority over M. marginalis (R. Scheffer) James Sincl. Additional collections have been made of the rare species Bocagea longepedunculata Martius, Xylopia crinita R.E. Fries, and Xylopia excellens R.E. Fries. Attention is drawn to several recent collections from Bahia, Brazil, which are perhaps referable to Unonopsis stipitata Diels. H. Leon, Popayan, and D. Sanchez S., Medellin, contributed to three of the new species.
30 citations
TL;DR: In Brazil, Annonaceae are represented by 29 genera and 386 species, mainly in the Amazon region, but also in the Atlantic Forest and cerrado, and the most diverse genera in Brazil are included in this group.
Abstract: In Brazil, Annonaceae are represented by 29 genera and 386 species, mainly in the Amazon region, but also in the Atlantic Forest and cerrado. Annonaceae are classified into four subfamilies, Anaxagoreoideae, Annonoideae, Ambavioideae and Malmeoideae. Anaxagoreoideae includes only Anaxagorea, and 14 species occur in Brazil. Ambavioideae consists of nine genera, but only Tetrameranthus occurs in Brazil, represented by three species. Annonoideae is the largest subfamily, with 51 genera, from which 12 occur in Brazil. The most diverse genera in Brazil, Annona, Duguetia, Guatteria and Xylopia, are included in this group. Malmeoideae includes mainly Asian genera, and only members of the tribe Malmeeae, with 13 genera, occur in Brazil. Index terms: Ambavioideae, Anaxagoreoideae, Annonaceae, Annonaceae genera, Annonoideae, Brasilian flora, Malmeoideae.
18 citations
1 Jan 1983
TL;DR: The small genus Tetrameranthus R.E. Fries, occurring in the Amazon region, is revised and two new species are described, in addition to the three already known.
Abstract: The small genus Tetrameranthus R.E. Fries, occurring in the Amazon region, is revised. Two new species are described, in addition to the three already known. Available data still indicate that this genus belongs in Annonaceae, but takes up an isolated position within that family.
16 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2019 | 1 |
| 2014 | 1 |
| 2012 | 1 |
| 1988 | 2 |
| 1986 | 1 |
| 1985 | 2 |