STUDIES IN <i>DACTILIS</i>

Parker, P F

doi:10.1111/j.1469-8137.1972.tb04083.x

Cited by 17 publications

(7 citation statements)

References 3 publications

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“…Recent cytogeographic studies indicate that there is a strong 'sub-tropical' element in the evolution ol Dactylis (Parker and Borrill, 1968;Benson and Borrill, 1969;Benson, 1966;Parker, 1971). All the taxa involved here have a South-Western distribution in the Mediterranean and Atlantic Islands, and all exhibit in some degree one or more of the following characteristic morphological features: papillose epidermis, persistent trailing and branching woody stems, inflated leaf sheaths (Borrill, 1961b).…”

Section: Pkyhgenetic Affinities Of Subsp Maireimentioning

confidence: 99%

DIPLOID‐TETRAPLOID SYMPATRY IN DACTYLIS(GRAMINEAE)

Borrill

Lindner

1971

New Phytologist

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SUMMARYThe known zones of contact between dipioid and tetraploid DactyUs are reviewed, and two welldocumented examples of intermixed and morphologically similar diploids and tetraploids are considered in detail. The relict subspecies mairei is accompanied, in its particular habitat, by a tetraploid counterpart. The evidence suggests this to be an example of autotetraploidy, the dipioid and tetraploid components of which have been preserved by isolation in a specialized relict habitat.In Dactylis interploid sympatry appears to have arisen in two ways-by changes in the original habitat, whereby morphologically dissimilar and spatially isolated diploids and tetraploids become intermixed, or by the formation of autotetraploids which co-exist in the 'dipioid' habitat and may subsequently be modified by hybridization with other diploids or tetraploids with which they come in contact.No triploid or tetraploid hybrids were discovered in the seedling progeny of dipioid Kerrata plants, hut the numbers screened are considered insufficient. Direct formation of tetraploid hybrids as a consequence of the functioning of unreduced gametes by dipioid parents can be a more effective 'genetic bridge' than the backcrossing of triploid hybrids. Further study of mixed diploid-tetraploid stands is therefore required to determine the frequency and effectiveness of this phenomenon in natural populations.

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Section: Pkyhgenetic Affinities Of Subsp Maireimentioning

confidence: 99%

DIPLOID‐TETRAPLOID SYMPATRY IN DACTYLIS(GRAMINEAE)

Borrill

Lindner

1971

New Phytologist

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“…tetraploid Madeiran D. smithii Link subsp. hylopdes Parker (Parker, 1972), Holcus (e.g. tetraploid Azorean H. rigidus Hochst.…”

Section: Discussionmentioning

confidence: 99%

Karyological analysis of the five native Macaronesian <i>Festuca</i> (Gramineae) grasses supports a distinct diploid origin of two schizoendemic groups

Sequeira¹,

Díaz-Pérez²,

Santos‐Guerra³

et al. 2009

Anal. Jard. Bot. Madr.

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“…E. Krause, 1913). For practical purposes, and if we take into consideration the geographical criteria, we can treat the whole complex within Europe as consisting of three parallel series of species: D. smithii Link (Atlantic islands, shores of the Mediterranean; d. Parker, 1972), D. hispanica Roth (Mediterranean countries), and D. glomerata, the secondary grassland species (extra-Mediterranean Europe). All of these have several diploid and/or tetraploid subspecies.…”

Section: Differentiation Processes By Cultural Impactmentioning

confidence: 99%

Grassland Evolution in Europe

Scholz

1975

TAXON

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Summary This discussion deals primarily with the European secondary grassland, especially meadows and pastures. The principal constituents of this vegetation are about 20 species. Particular attention is paid to its evolution under the influence of man. In addition to the natives (members of natural vegetation cover) there are several species or races which are restricted to man‐made habitats. It is suggested that these latter are not native to the area of present distribution, but have immigrated under differentiation from abroad (the minor part) or evolved in situ (the major part). The significance of hybridization and introgression is stressed. It is contended that grassland evolution is still in progress, an important factor being the close interaction between cultivated grasses and their wild relatives in extra‐Mediterranean Europe, the center of diversity and origin of meadow and pasture grasses.

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STUDIES IN DACTILIS

Abstract: Summary Samples of populations of Dactylis smithii native to Madeira were collected for studying seed set and morphological characteristics. The analysed data showed two main groupings, the reasons for these groupings and the resultant classification are discussed.

Cited by 17 publications

References 3 publications

DIPLOID‐TETRAPLOID SYMPATRY IN DACTYLIS(GRAMINEAE)

DIPLOID‐TETRAPLOID SYMPATRY IN DACTYLIS(GRAMINEAE)

Karyological analysis of the five native Macaronesian <i>Festuca</i> (Gramineae) grasses supports a distinct diploid origin of two schizoendemic groups

Grassland Evolution in Europe

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