Cell fusion: A possible mechanism for the origin of polyploidy

Spies, J. J.; Wyk, S. M. C. Van

doi:10.1016/s0254-6299(15)30480-4

Cited by 5 publications

(5 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This process involves the formation of polynucleate microspores after cell fusion and the conse quent formation of polyhaploid pollen. This phenomenon is frequently observed in grasses and was discussed by Spies & Van Wyk (1995). Phalaris aquatica was repre sented by a diploid specimen (n = x = 7) in this study.…”

Section: Resultssupporting

confidence: 54%

“…The only specimen of P. aquatica investigated, had both diploid (n = x = 7) and tetraploid (n = 2x = 14) chromosome numbers (Figure 1A, B). We attribute this apparent discrepancy to cell fusion (Spies & Van Wyk 1995). This process involves the formation of polynucleate microspores after cell fusion and the conse quent formation of polyhaploid pollen.…”

Section: Resultsmentioning

confidence: 95%

See 1 more Smart Citation

Cytogenetic studies in some representatives of the subfamily Pooideae (Poaceae) in South Africa. 2. The tribe Aveneae, subtribes Phalaridinae and Alopecurinae

Spies

Rooyen

et al. 1996

Bothalia

View full text Add to dashboard Cite

This is a report on chromosome numbers for the subtribes Phalaridinae and Alopecurinae (tribe Aveneae) which are. to a large extent, naturalized in South Africa. Chromosome numbers of 34 specimens, representing nine species and four genera, are presented. These numbers include the first report on Agrostis avenacea Gmel. (n = 4x = 28). New ploidv levels are reported for Phalaris aquatica L. (n = x = 7), Agrostis barbuligera Stapf var. barbuligera (n = 2x = 14 and n = 4x = 28) and A. lachnantha Nees var. lachnantha (n = 3x = 21).

show abstract

Section: Resultssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 95%

Cytogenetic studies in some representatives of the subfamily Pooideae (Poaceae) in South Africa. 2. The tribe Aveneae, subtribes Phalaridinae and Alopecurinae

Spies

Rooyen

et al. 1996

Bothalia

View full text Add to dashboard Cite

show abstract

“…Higher ploidy levels were detected in some of the cells of these specimens. This could be caused by cell fusion (Spies & Van Wyk 1995) which is not uncommon in the genus Pentaschistis ( Figure 5). …”

Section: Number O F Specimens Per Ploidy Levelmentioning

confidence: 99%

Cytogenetic studies in the genus <i>Pentaschistis</i> (Poaceae: Arundinoideae)

Klopper¹,

Spies²

1998

Bothalia

View full text Add to dashboard Cite

Cytogenetic studies of 45 specimens, representing 16 taxa of the genus Pentaschistis (Nees) Spach confirmed two basic chromosome numbers (x = 7, 13) for the genus. Chromosome numbers for five species and one subspecies are described for the first time, i.e. P. aim ides subsp. jugorum (n = 2x = 14). P. colorata (n = 2x = 14). P densifolia (n = x = 7), P. linui (n = 6x = ± 42), P. rigidissim a (n = x = 7, n = 3x = 21) and P viscidula (n = 3x = 21). Polyploidy occurs frequently and new ploidy levels are described m four of the species, namely P airoides (Nees) Stapf subsp. airoides (n = 3x = 21), P. cirrhulosa (Thunb.) McClean (n = x = 7), P. eriostoma (Nees) Stapf (n = 3x = 39+0-4B) and P rupestris (n = 4x = 28) The majority of species form young polyploid complexes. There seems to be no correlation between cytogenetic data and mor phological groupings within Pentaschistis.

show abstract

“…Hexaploid (P rupestris), octaploid (P densifolia, P lima, P. tortuosa) (Figure 3D, E), decaploid (P. rupestris, P. viscidula) and up to 14-ploid levels (P. rupestris) were also observed. Higher ploidy levels in some cells of specimens can be caused by cell fusion (Spies & Van Wyk 1995). It is not an uncommon phenomenon in this genus.…”

Section: •V W R *mentioning

confidence: 95%