Evidence for autotetraploidy in Plantago media and comparisons between natural and artificial cytotypes concerning cell size and fertility

Dijk, Peter van; Delden, W. van

doi:10.1038/hdy.1990.104

Cited by 34 publications

(43 citation statements)

References 30 publications

(33 reference statements)

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“…Selection against hybridization was maximum due to 100 hybrid inviability. This is not unrealistic as hybrids in interploidy crosses are often inviable or sterile (Woodell & Valentine, 1961;Kay, 1969;Johnston et al, 1980;van Dijk & van Delden, 1990).…”

Section: Resultsmentioning

confidence: 99%

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Simulations of flowering time displacement between two cytotypes that form inviable hybrids

Dijk

Bijlsma

1994

Heredity

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The evolution of reproductive isolation by flowering time displacement between two cytotypes that produce inviable hybrids was studied by computer simulations in an isolation-by-distance model. Flowering time distribution was stabilized by mass-action, both by the mating procedure and by pollen-limited seed-production in early or late flowering plants. Coexistence had to last long enough for flowering time divergence to evolve. This could only be achieved in a mosaic of local patches or parapatry. The model showed that flowering time displacement occurred despite the stabilizing effect of mass-action and the restricted width of the interaction zone. Initially an inverse dine for flowering time was formed but after 200 generations this dine had become monotonic. In contrast to the possible swamping effect by gene flow from outside the zone, there was a spread of genes into the allopatric ranges.

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Section: Resultsmentioning

confidence: 99%

“…Almost all triploid hybrids between the cytotypes are inviable because of endosperm collapse (van Dijk & van Delden, 1990). In an area in the Pyrenees where diploids and tetraploids are sympatric, the cytotypes are almost completely separated in flowering time (van Dijk, 1991;van Dijk ci' al., 1992).…”

Section: Introductionmentioning

confidence: 99%

Simulations of flowering time displacement between two cytotypes that form inviable hybrids

Dijk

Bijlsma

1994

Heredity

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“…As a result, the production of 2n gametes is now thought to be the commoner mode of origin of polyploid plants (Bringhurst, 1990;Lumaret & Barrientos, 1990;Van Dijk & Van Delden, 1990;Rabe & Haufier, 1992). Furthernnore, recent studies using cultivated material have shown the potential importance of 2n gamete production in breeding fodder crops (Hermsen, 1984c;Veilleux, 1985;Singh, Moss & Smartt, 1990;Lumaret, 1991;Bingham, Smith & Casler, 1991;Ramanna, 1992).…”

Section: Discussionmentioning

confidence: 99%

Gametes with the somatic chromosome number: mechanisms of their formation and role in the evolution of autopolyploid plants

1995

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summary The production of 2n gametes in plants, i.e. gametes with a somatic chromosome number, is considered to be the dominant process involved in the origin of polyploid plants. In this review, we provide a synthesis of current knowledge concerning the production of 2n gametes. Firstly, we describe the different methods used to detect and quantify the production of 2n gametes in plants, which include morphological and flow cytometry screening of the occurrence of 2n pollen, the analysis of crosses among diploid and tetraploid parents and the instigation of micro‐and mega‐sporogenesis. Secondly, the high level of inter‐ and infra‐specific variation in 2n gametes production is described. Thirdly, the various cytological anomalies responsible for the production of 2n gametes are reviewed, with particular reference to the relative genetic consequences of the first and second restitution divisions that give rise to 2n gametes. Fourthly, the significance of 2n gametes in crop plant improvement is discussed, in relation to somatic chromosome doubling to obtain new polyploid varieties. In particular, we compare the genetic and yield consequences of methods based on unilateral and bilateral sexual polyploidization. Finally, we outline how knowledge of the variety of mechanisms involved in 2n gamete production have increased our understanding of the evolutionary significance of polyploidy and the population biology of polyploid plants.

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“…Heavier seeds in the tetraploids may be considered as a direct effect of polyploidy (Evans, 1967;Hague & Jones, 1987;Pfahler, Barnett & Luke, 1987;Feuerstein & Paul, 1990;Van Dijk & Van Delden, 1990). Moreover, in Galician Dactylis the bigger seeds produced by the tetraploids also generate bigger seedlings as compared to those of the diploids (in the same experimental conditions) (Maceira, unpublished data).…”

Section: Competitive Ability and Ploidy Levelmentioning

confidence: 99%

“…Indeed, competition experiments between diploids and closely related autopolyploids are extremely rare, possibly because natural sympatric populations, for which the autopolyploid origin of the polyploids has been clearly determined, have only rarely been detected (e.g. Lumaret, Bowman & Dyer, 1989;Lumaret & Barrientos, 1990;Van Dijk & Van Delden, 1990). Competition experiments between diploids and colchicine-induced autopolyploids (e.g.…”

Section: Introduction Restrictive Two Conditions Seem To Be Particulmentioning

confidence: 99%

Competition between diploid and derivative autotetraploid Dactylis glomerata L. from Galicia. Implications for the establishment of novel polyploid populations

Maceira

Jacquard²,

Lumaret³

1993

New Phytologist

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SUMMARYThe competitive ability of a tetraploid, and its morphologically indistinguishable progenitor diploid Dactylis glomerata L., from Galicia (Spain), was tested in a two-year study, using isolated plants and the same individuals grown at two densities (16 and 36 plants per pot, respectively). Inverse linear regression equations were used to quantify the response of the different ploidy levels (hereafter cytotypes) to density. For the diploids, inter-cytotype competition coefficients were significantly higher than intra-cytotype coefficients. The substitution rate mcreased from 1-8 m the first year to 3-9 m the second year, when most of the diploids failed to flower and some died. The competitive superiority of the tetraploids was associated with higher mean tiller weight, particularly in the mixed cultures. The tetraploids also had heavier seeds and faster leaf production in early spring, and they flowered earlier than the diploids. Several of these differences between cytotypes appear to be due to differences in ploidy level and may play a major role in the establishment of the tetraploids in Galician pastures, where competition is high.

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Evidence for autotetraploidy in Plantago media and comparisons between natural and artificial cytotypes concerning cell size and fertility

Cited by 34 publications

References 30 publications

Simulations of flowering time displacement between two cytotypes that form inviable hybrids

Simulations of flowering time displacement between two cytotypes that form inviable hybrids

Gametes with the somatic chromosome number: mechanisms of their formation and role in the evolution of autopolyploid plants

Competition between diploid and derivative autotetraploid Dactylis glomerata L. from Galicia. Implications for the establishment of novel polyploid populations

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