The F2 progeny resulting from the crossing of coprosma propinqua ♀ with C. Robusta ♂

Allan, H. H.

doi:10.1007/bf01726704

Cited by 13 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There is ample precedent for the taxonomic recognition of ecotypes as species in suitable cases and when it is convenient to do so (e.g., M elandrium rubrum and album Baker (1948), Coprosma propinqua and robusta (Allan, 1929), Salvia apiana and melli/era (Anderson and Anderson, 1954) etc., etc.). In the genus Pteris there are many unrelated species which show a deceptive morphological resemblance but which must necessarily be treated as separate.…”

Section: Discussionmentioning

confidence: 99%

HYBRIDIZATION IN SOME SPECIES OF PTERIS L.

Walker¹

1958

Evolution

View full text Add to dashboard Cite

Section: Discussionmentioning

confidence: 99%

HYBRIDIZATION IN SOME SPECIES OF PTERIS L.

Walker¹

1958

Evolution

View full text Add to dashboard Cite

“…Such backcrosses can be performed experimentally (Allan, 1926) and leaf morphologies ranging between the parental forms are commonly observed in the field. Molecular analysis of three individuals showed that these had mixed sequences corresponding to the additive combination of their two suggested progenitors, C. propinqua · C. robusta.…”

Section: Intra-individual Heterogeneity Was Found In a Hybrid Diploidmentioning

confidence: 99%

Elevated genetic heterogeneity and Pleistocene climatic instability: inferences from nrDNA in New Zealand Coprosma (Rubiaceae)

Wichman

Wright

Cameron

et al. 2002

Journal of Biogeography

View full text Add to dashboard Cite

Aim To examine patterns of hybridization and genotype mixing within the genus Coprosma J.R.Forst. & G.Forst. (Rubiaceae). Location New Zealand Methods Nucleotide sequence was determined for the internal transcribed spacer (ITS) and external transcribed spacer (ETS) regions of nuclear ribosomal DNA for fifty individuals from thirty‐six taxa within the New Zealand component of the genus Coprosma. Results Mixed sequences were found to be widespread in Coprosma. Direct sequencing of ITS polymerase chain reaction (PCR) products from seven polyploid taxa showed evidence of sequence mixtures. Cloning and sequencing of individual PCR products from two polyploids confirmed the presence of multiple templates, one of which corresponded to that of a diploid. Intra‐individual heterogeneity was also seen in a hybrid diploid taxon, with the mixed nucleotides corresponding to those of the parental lineages. Finally the ITS sequences of twenty‐two diploid taxa showed that eleven contained intra‐individual heterogeneity. Conclusions We conclude that the widespread occurrence of sequence mixtures in Coprosma results from of frequent hybridization. We also conclude that concerted evolution of the ITS and ETS regions is depressed. We propose that these characteristics evolved as a mechanism to maintain high levels of heterogeneity and suggest that this is adaptive for Coprosma in climatically unstable and physically complex New Zealand landscapes. These landscapes have been subjected to repeated oscillations between stadial and interstadial environments during the Pleistocene.

show abstract

“…Long-distance hybrids are known in at least three other anemophilous New Zealand genera, as follows: Coprosma propinqua • robusta (Rubiaceae) This fertile hybrid is frequent in the wild, and has been constituted experimentally (Allan 1929). C. …”

Section: Fertilisation By Distant Pollenmentioning

confidence: 99%

Effects of glacial climates on floristic distribution in New Zealand 2. The role of long-distance hybridisation in disjunct distributions

Wardle¹,

Harris²,

Buxton³

1988

New Zealand Journal of Botany

View full text Add to dashboard Cite

In Part 1, it is proposed that coldintolerant disjunct species in southern and central centres of floristic richness occur as the result of post-glacial long-distance hybridisation with resident hardier species, followed by reconstitution of the less hardy species. For this to operate, the species involved must hybridise freely, pollen must be transported over long distances, and it must retain viability.Nothofagus species meet these conditions, and their hybrids have been found several kilometres from one parent. Hybrids between three other pairs of anemophilous species have probably arisen through pollen dispersal over hundreds ofkilometres. Early post-glacial conditions are likely to have been especially conducive to segregation of immigrant species from populations of fertile hybrids.

show abstract

The F2 progeny resulting from the crossing of coprosma propinqua ♀ with C. Robusta ♂

Cited by 13 publications

References 0 publications

HYBRIDIZATION IN SOME SPECIES OF PTERIS L.

HYBRIDIZATION IN SOME SPECIES OF PTERIS L.

Elevated genetic heterogeneity and Pleistocene climatic instability: inferences from nrDNA in New Zealand Coprosma (Rubiaceae)

Effects of glacial climates on floristic distribution in New Zealand 2. The role of long-distance hybridisation in disjunct distributions

Contact Info

Product

Resources

About