Natural hybridization with particular reference to introgression

Heiser, Charles B.

doi:10.1007/bf02861577

Cited by 85 publications

(46 citation statements)

References 104 publications

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“…Thus, the presence of hybrids does not invalidate the taxonomic structure that was presented above for the species or subspecies involved (Levin 2000). Interspecific hybrids are well-known in many other herbaceous and woody angiosperm genera in New Zealand and elsewhere (Anderson 1953;Rechrnger 1957;Heiser 1961;Fisher 1965;Stebbins 1969;Stace 1975 ;Raven & Engelhorn 1971 ;Smissen & Heenan 2007;Smissen & Breitwieser 2008).…”

Section: Hybridisationmentioning

confidence: 99%

GenusPimelea(Thymelaeaceae) in New Zealand 2. The endemicPimelea prostrataandPimelea urvillianaspecies complexes

Burrows

2009

New Zealand Journal of Botany

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Section: Hybridisationmentioning

confidence: 99%

GenusPimelea(Thymelaeaceae) in New Zealand 2. The endemicPimelea prostrataandPimelea urvillianaspecies complexes

Burrows

2009

New Zealand Journal of Botany

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“…This approach assumes that the degree of chromosome pairing is proportional to the level of overall genomic divergence -an assumption now largely invalidated by the discovery of genes that control chromosome pairing (Jackson, 1985). Nevertheless, numerous crossing studies have been performed, and substantial evidence has been gathered on the kinds and strength of postmating reproductive barriers in both closely and distantly related plants species (Heiser, 1949 ;Stebbins, 1957 ;Levin, 1979 ;Grant, 1981 ;Jackson, 1985). Common postmating barriers include hybrid weakness or inviability, hybrid sterility and hybrid breakdown in which first generation (F " ) hybrids are robust and fertile, but later generation hybrids are weak or inviable.…”

Section: Postzygotic Barriersmentioning

confidence: 99%

Plant hybridization

1998

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Summary 599 I. Introduction 599 II. Concepts and terminology 600 III. Historical background 600 IV. Studies of experimental hybrids 601 1. Isolating mechanisms 601 2. Prezygotic barriers 602 (a) Gametic barriers to hybridization 602 3. Postzygotic barriers 603 (a) Chromosomal rearrangements 604 (b) Genic sterility or inviability 604 4. Hybrid vigour 605 5. Introgression 606 6. Hybrid speciation 607 V. Experimental manipulations of natural hybrid populations 609 1. Hybrid‐zone formation 610 2. Pollinator‐mediated selection 610 3. Habitat selection 612 VI. The biology of different classes of hybrids 612 1. Character expression 613 (a) Morphological characters 613 (b) Chemical characters 613 (c) Molecular characters 613 2. The fitness of different classes of hybrids 614 (a) The importance of variance 614 (b) Estimating hybrid fitness 615 3. Interactions with parasites and herbivores 616 4. Patterns of mating 617 (a) Outcrossing rate 617 (b) Hybridization frequency 618 (c) Mate choice 618 VII. Conclusions and future research 619 Acknowledgements 620 References 620 Most studies of plant hybridization are concerned with documenting its occurrence in different plant groups. Although these descriptive, historical studies are important, the majority of recent advances in our understanding of the process of hybridization are derived from a growing body of experimental microevolutionary studies. Analyses of artificially synthesized hybrids in the laboratory or glasshouse have demonstrated the importance of gametic selection as a prezygotic isolating barrier; the complex genetic basis of hybrid sterility, inviability and breakdown; and the critical role of fertility selection in hybrid speciation. Experimental manipulations of natural hybrid zones have provided critical information that cannot be obtained in the glasshouse, such as the evolutionary conditions under which hybrid zones are formed and the effects of habitat and pollinator‐mediated selection on hybrid‐zone structure and dynamics. Experimental studies also have contributed to a better understanding of the biology of different classes of hybrids. Analyses of morphological character expression, for example, have revealed transgressive segregation in the majority of later‐generation hybrids. Other studies have documented a high degree of variability in fitness among different hybrid genotypes and the rapid response of such fitness to selection – evidence that hybridization need not be an evolutionary dead end. However, a full accounting of the role of hybridization in adaptive evolution and speciation will probably require the integration of experimental and historical approaches.

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“…The entire subject of natural hybridization and introgressive hybridization was reviewed by Heiser ( 1949) . With the development of the concept of the pictorialized scatter diagram, workers in the field of experimental taxonomy and plant breeding were given a new tool which has proven to be of the utmost importance in the study of natural hybridization and introgression in many groups of organisms.…”

Section: Garden Hybrids Series Californicae X Series Californicaementioning

confidence: 99%

Hybridization and Speciation in the Pacific Coast Irises

Lenz¹

1959

aliso

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Natural hybridization with particular reference to introgression

Cited by 85 publications

References 104 publications

GenusPimelea(Thymelaeaceae) in New Zealand 2. The endemicPimelea prostrataandPimelea urvillianaspecies complexes

GenusPimelea(Thymelaeaceae) in New Zealand 2. The endemicPimelea prostrataandPimelea urvillianaspecies complexes

Plant hybridization

Hybridization and Speciation in the Pacific Coast Irises

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