Some Cytological Observations in the Loganiaceae

Gadella, Th.W.J.

doi:10.1111/j.1438-8677.1962.tb00075.x

Cited by 10 publications

(4 citation statements)

References 5 publications

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“…Numerous chromosome counts and related cytological studies, as wel1 as important cytogenetic and hybridization investigations, have been published for the genus, but especial1y for the Campanula rotundifolia L. complex. A review of this extensive literature is beyond the scope of the present paper, but one must call attention at least to the papers by Suguira (1942), Darlington and LaCour (1950), Bacher (1960Bacher ( , 1964Bacher ( , 1966, Gadella (1962Gadella ( , 1963Gadella ( , 1964, Podlech (1962), Phitos (1963Phitos ( , 1964, Bielawska (1964Bielawska ( , 1968Bielawska ( , 1972Bielawska ( , 1973, Contandriopoulos (1964Contandriopoulos ( , 1966Contandriopoulos ( , 1970Contandriopoulos ( , 1972Contandriopoulos ( , 1976, Podlech and Damboldt (1964), Damboldt (1965), Kovanda (1966aKovanda ( , b, 1970Kovanda ( , 1977, Laane (1968), McAllister (1972, Geslot (1973) and Shetler (1979). Gadella (1964) briefly reviewed the literature on reproductive biology up to that time.…”

Section: Introductionmentioning

confidence: 98%

POLLEN‐COLLECTING HAIRS OF CAMPANULA (CAMPANULACEAE), I: HISTORICAL REVIEW

Shetler

1979

TAXON

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Summary The literature on the unique pollen‐collecting hairs of Campanula (Campanulaceae) is reviewed as background for new pollination studies, with particular reference to the nature and function of the collecting‐hair mechanism in the breeding system. The main features of the floral mechanism, including the pronounced dichogamy (protandry) and insect adaptation, were first described and depicted accurately by Sprengel in 1793, although pollination observations date back at least to Linnaeus in 1738. Numerous other workers have since added details but little that is basically new to our knowledge of the floral mechanism. Brief reference is made to some of the significant contributions to cytology, cytogenetics, and pollen morphology in recent years. Campanula is basically allogamous, although cases of limited autogamy are known. Experimental studies have shown that campanulas range from complete self‐sterility to complete self‐compatibility, but self‐fertilization usually is accomplished only with difficulty under experimental conditions, and there is little evidence of spontaneous self‐pollination in nature. The pollen is presented from the hairs on the style, which collect the pollen from the anthers while in the bud. The hairs have been known since 1839 to possess the unusual capacity to retract into the style, but the adaptive significance of this mechanism has yet to be explained satisfactorily. The collecting hairs, since before they were known to invaginate, have been interpreted by some investigators as part of a mechanism either to effect fertilization directly through the style without the stigmas or as a back‐up to insure autogamy when cross‐pollination breaks down. Although little evidence exists to support either view, there is still no definitive explanation of their function in the breeding system. Among campanulaceous families, the genera of the Campanulaceae s.str. are believed to have the least advanced (“naked”) form of stylar pollen presentation.

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Section: Introductionmentioning

confidence: 98%

POLLEN‐COLLECTING HAIRS OF CAMPANULA (CAMPANULACEAE), I: HISTORICAL REVIEW

Shetler

1979

TAXON

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“…Both B. davidii and B. indica are tetraploids (2n = 76) (Gadella, 1962;Moore, 1947Moore, , 1960. Buddleja indica is the only known davidii.…”

Section: Methodsmentioning

confidence: 99%

A Novel Intersectional Buddleja Hybrid

Lindstrom¹,

Bujarski²,

Burkett³

2004

HortSci

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Buddleja indica Lam. is encountered frequently as a houseplant or a conservatory specimen and is attractive ornamentally for its oak-shaped foliage. Buddleja indica, a tetraploid African species, 2n = 76, was crossed to the Asiatic tetraploid species B. davidii Franch. The F1 generation was intermediate in foliage character between the two parents. Flowers of the F1 were either white or light lavender in color and the number of flowers per inflorescence was intermediate between the parents. The F1 plants were fertile. These hybrids might be suitable for greenhouse or container culture due to their attractive foliage and floral display.

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“…Recent introgression and hybridization events together with incomplete lineage sorting are the likely causes for this pattern ( Nicoletti et al 2014 ). Multiple hybridization and allopolyploidization events are assumed ( Podlech 1965 ), with three dominant ploidy levels observed within the group: 2 n = 2 x = 34, 2 n = 4 x = 68 and 2 n = 6 x = 102 ( Gadella 1962 ). Odd ploidy levels (2 n = 3 x = 51, 2 n = 5 x = 85) and aneuploid individuals were only rarely found in nature, but were observed in cultivation after artificial crosses ( Podlech 1965 ; Kovanda 1966 ; Shetler 1982 ).…”

Section: Introductionmentioning

confidence: 99%

Heteroploid reticulate evolution and taxonomic status of an endemic species with bicentric geographical distribution

2017

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Campanula baumgartenii is an endemic species of the polyploid complex Campanula section Heterophylla with a peculiar bicentric distribution. C. baumgartenii often grows in sympatry with other morphologically similar Campanula species (C. rotundifolia). Hence its species status has been doubtful. Using a multimethodological approach we confirmed the species status of C. baumgartenii and uncovered complex patterns of genetic and ploidal variability. These were identified as resulting from dynamic and ongoing evolutionary processes including several hybridization and backcrossing events. This study also illustrates that detailed population genetic studies can provide a solid basis for sound identification of conservation targets.

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Some Cytological Observations in the Loganiaceae

Cited by 10 publications

References 5 publications

POLLEN‐COLLECTING HAIRS OF CAMPANULA (CAMPANULACEAE), I: HISTORICAL REVIEW

POLLEN‐COLLECTING HAIRS OF CAMPANULA (CAMPANULACEAE), I: HISTORICAL REVIEW

A Novel Intersectional Buddleja Hybrid

Heteroploid reticulate evolution and taxonomic status of an endemic species with bicentric geographical distribution

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