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  • 1
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Karyologie und Mikrosporogenese vonPelargonium sect.Pelargonium (Geraniaceae) (1984)
    Springer
    Plant systematics and evolution 147 (1984), S. 177-188 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Geraniaceae ; Pelargonium ; Chromosome numbers ; karyotypes ; microsporogenesis ; karyogeobotany ; karyotaxonomy ; karyotype evolution ; basic number
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The chromosome numbers of the 24 species of sect.Pelargonium were determined from field collected and cultivated plants of known localities in S. Africa. Twelve species are diploid (2n = 22), eight tetraploid (2n = 44), one hexaploid (2n = 66), and three octoploid (2n = 88). The chromosome numbers correlate well with the proposed subdivision of sect.Pelargonium. Its chromosomes are relatively small (1.0–1.5 µm) in comparison to most of the other sections, and its diploid karyotype is considered to be primitive. The occurrence of the basic number x = 11 in this section, in other sections of the genus, and in related genera (Monsonia, Sarcocaulon) leads to the conclusion that x = 11 probably is basic for the whole genus. — The pollen meiosis, microsporogenesis and pollen fertility of the diploid species is normal, with the exception of one, possibly young taxon from the Greyton Nature Reserve. The tetraploid species could be of autoploid origin, the higher polyploids exhibit a mixed auto-alloploid nature. — The 20 diploid and tetraploid species have a relatively small distribution range, most of them occur in the SW. Cape Province of South Africa. This area may therefore be considered as the centre of origin of the genus. Three of the four high polyploid species occupy rather large areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989382
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  • 2
    Electronic Resource
    Electronic Resource
    Delimitation ofPelargonium sect.Glaucophyllum (Geraniaceae) (1990)
    Springer
    Plant systematics and evolution 171 (1990), S. 15-26 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Geraniaceae ; Pelargonium sect.Glaucophyllum ; Morphology ; pollen ; chromosome numbers ; flavonoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Pelargonium otaviense Knuth andP. spinosum Willd. are excluded from sect.Glaucophyllum, whileP. grandiflorum (Andr.)Willd.,P. patulum Jacq. andP. tabulare (Burm. f.)L'Hérit. of sect.Eumorpha are included. Sect.Glaucophyllum is characterized by green to glaucous vegetative organs and zygomorphic white to pink corolla with five narrow petals. All the species have an identical pollen and chromosome morphology, the same basic chromosome number (x = 11) and similar flavonoid patterns. A close relationship between sect.Glaucophyllum and sect.Pelargonium is indicated by the occurrence of natural hybrids and concordant characters. Isorhamnetin and luteolin have been detected in the genus for the first time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00940594
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  • 3
    Electronic Resource
    Electronic Resource
    Cytological variation and evolution withinPelargonium sectionHoarea (Geraniaceae) (1996)
    Springer
    Plant systematics and evolution 203 (1996), S. 111-142 
    Details
    ISSN: 1615-6110
    Keywords: Pelargonium ; sect.Hoarea ; Chromosomes ; B chromosomes ; Robertsonian translocation ; centric fusion ; evolution ; systematics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chromosome numbers of 65 species of sect.Hoarea have been determined. These show three basic chromosome numbers, x = 11, 10 and 9. Only a few species are tetraploid. In five species both diploid and tetraploid cytotypes are reported. Several cases of deviations in chromosome numbers and cytological abnormalities were found, most of these being related to the presence of B chromosomes that occur in eight species. Evidence is presented to suggest that the basic chromosome numbers of x = 10 and x = 9 are derived from x = 11 by centric fusion. Although variation in basic chromosome number withinPelargonium has been the subject of detailed study, this is the first time that evidence has been found for a mechanism of change in basic number, that of centric fusion by Robertsonian translocation. For the species of sect.Hoarea with x = 9, where the evidence for Robertsonian translocation is greatest, this process has probably taken place quite recently. In contrast to results from other sections of the genusPelargonium, the three different basic numbers of sect.Hoarea do not contradict its delimitation as a natural taxon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985241
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  • 4
    Electronic Resource
    Electronic Resource
    A reappraisal ofPelargonium sect.Ligularia (Geraniaceae) (1992)
    Springer
    Plant systematics and evolution 179 (1992), S. 257-276 
    Details
    ISSN: 1615-6110
    Keywords: Angiosperms ; Geraniaceae ; Pelargonium ; Chromosome numbers ; karyotypes ; hybridization ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A study of 33 species ofPelargonium sect.Ligularia reveals four basic chromosome numbers, x = 8, 9, 10, and 11, and variation in chromosome size. From evidence of karyology and hybridization attempts, proposals are made to divide the section into smaller groups and to transfer some species to other sections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00937601
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  • 5
    Electronic Resource
    Electronic Resource
    Diploide und tetraploide Sippen vonAira (Poaceae) im Massif des Maures (Provence) (1973)
    Springer
    Plant systematics and evolution 122 (1973), S. 293-298 
    Details
    ISSN: 1615-6110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary The chromosome numbers of some members of the genusAira L. in this area are determined,A. capillaris (n=7),A. tenorii (n=7),A. cupaniana (n=1) are diploid,A. provincialis (n=14) andA. caryophyllea (n=14) are tetraploid. The spikelets ofA. cupaniana are analysed and compared with them ofA. multiculmis.
    Notes: Zusammenfassung Die Chromosomenzahlen der im Massif des Maures (Provence) vorkommenden Vertreter der GattungAira L.,A. capillaris (n=7),A. tenorii (n=7),A. provincialis (n=14),A. caryophyllea (n=14) undA. cupaniana (n=7) wurden bestimmt. DasA. cupaniana-Material wurde blütenmorphologisch analysiert und mitA. multiculmis verglichen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01376231
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  • 6
    Electronic Resource
    Electronic Resource
    Zwei Ausgangskaryotypen bei der Gräser-GattungAira L. (1973)
    Springer
    Plant systematics and evolution 121 (1973), S. 251-254 
    Details
    ISSN: 1615-6110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary Chromosome numbers of all known species of the genusAira L. are counted:A. capillaris Host, 2n=14;A. caryophyllea L., 2n=14 and 28;A. multiculmis Dum., 2n=28;A. praecox L., 2n=14;A. tenorii Guss., 2n=14;A. provincialis Jord., 2n=28 andA. cupaniana Guss., 2n=14. The numbers of the last three species are published for the first time. Two different karyotypes are found amongst the diploids: A is widespread, B limited toA. praecox. The karyotype of the tetraploidA. caryophyllea can be described as AB, that ofA. multiculmis as AA. — Remarks on the distribution of the species and cytotypes are added.
    Notes: Zusammenfassung Für die Arten der GattungAira L. werden die folgenden Chromosomenzahlen mitgeteilt:A. capillaris Host, 2n=14;A. caryophyllea L., 2n=14 und 28;A. multiculmis Dum., 2n=28;A. praecox L., 2n=14;A. tenorii Guss., 2n=14;A. provincialis Jord., 2n=28 undA. cupaniana Guss., 2n=14. Die Zahlen der letzten drei Arten werden zum erstenmal veröffentlicht. Bei den diploiden Arten kommen zwei unterschiedliche Karyotypen vor: A ist verbreitet, B aufA. praecox beschränkt. Der Karyotyp der tetraploidenA. caryophyllea setzt sich aus A+B zusammen, während es sich beiA. multiculmis um eine Verdoppelung von A handelt. — Über die Verbreitung der Arten und Cytotypen werden einige Hinweise gegeben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01373974
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  • 7
    Electronic Resource
    Electronic Resource
    Vergleichende Karyologie der Gräser-SubtribenAristaveninae undAirinae (Poaceae — Aveneae) (1980)
    Springer
    Plant systematics and evolution 136 (1980), S. 137-167 
    Details
    ISSN: 1615-6110
    Keywords: Poaceae (=Gramineae) ; Aveneae ; Aristaveninae ; Airinae ; Chromosome numbers ; karyotypes ; idiograms ; DNA contents ; amphiplasty ; evolutionary strategies ; nukleotype
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The chromosome numbers of nearly all species of the grass subtribesAristaveninae andAirinae from Europe and northern Africa are presented. Among theAristaveninae the genusAristavena has 2n = 14 chromosomes, whereasDeschampsia forms a polyploid series with the basic number x = 13. In the subtribeAirinae the basic number x = 7 predominates.Avenella includes a polyploid series up to dekaploidy, whilst the lowest diploid value so far known in grasses — caused by descending dysploidy — exists in the annual generaAiropsis andPeriballia with 2n = 8. From both subtribes 12 different karyotypes are described and depicted as idiograms. The basic karyotypes ofCorynephorus, Periballia andVahlodea differ from each other by different chromosome length. SAT-chromosomes in theAirinae vary somewhat. Some marker chromosomes eludicate phylogenetic relationships. Amphiplasty appears in various genera and was studied particularly in the amphidiploidAira caryophyllea. Karyological and genomatic trends are considered in relation to evolutionary strategies of annuals and perennials. The nuclear DNA content of some species has been determined cytophotometrically. In subtribeAirinae a positive correlation exists between chromosome volume, pollen diameter, and DNA content. A comparison of the duration of microsporogenesis and microgametogenesis in annual and perennial species with their nuclear DNA content has shown that a primary nucleotypic influence is not recognizable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01004624
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