Genetics and Morphological Evolution in Plants

Gottlieb, L. D.

doi:10.1086/284231

Cited by 360 publications

(199 citation statements)

References 88 publications

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“…Qualitative character such as shape and texture more stable than quantitative character like size [10]. Gottlieb [11] states that shape of organ, likes leafs and fruit shape are stable and conserve characters used in phenetic analysis in taxonomic research. The quantitative characters that distinguish among sample category as weighted character by taxonomic.…”

Section: Resultsmentioning

confidence: 99%

Variation and intraspecies classification of edible canna (Canna indica L.) based on morphological characters

Sari

Purnomo

Daryono

et al. 2016

AIP Conference Proceedings

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Section: Resultsmentioning

confidence: 99%

Variation and intraspecies classification of edible canna (Canna indica L.) based on morphological characters

Sari

Purnomo

Daryono

et al. 2016

AIP Conference Proceedings

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“…First, F " hybrids were shown to be a mosaic of both parental (45n2 %) and intermediate (44n7 %) morphological characters rather than just intermediate ones. A possible explanation for the high proportion of parental characters expressed in hybrids is that many morphological traits that differentiate closely related species display dominant inheritance patterns (Hilu, 1983 ;Gottlieb, 1984). Thus, the expression of parental or intermediate character states in hybrids will depend on the nature of the genetic control of a particular character, as well as interactions with the environment.…”

Section: Character Expressionmentioning

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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“…Debates during the 1980s over the strength of empirical evidence for the evolutionary importance of large-effect mutations (Gottlieb 1984;Coyne and Lande 1985) culminated in a cautious but technically thorough challenge to the micromutationist perspective by Orr and Coyne (1992). They concluded that Fisher's reasoning about the insignificance of major mutations was flawed on several grounds and that the evidence for micromutationism was surprisingly weak.…”

Section: Manuscript Received July 2002; Revised Manuscript Received Nmentioning

confidence: 99%

Candidate Genes, Quantitative Trait Loci, and Functional Trait Evolution in Plants

Remington

Purugganan

2003

International Journal of Plant Sciences

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Two key characteristics of the neo-Darwinian synthesis in evolutionary biology have been its emphasis on the importance of mutations of small effect (micromutationism) and the view that studies of individual gene function shed relatively little light on evolutionary processes. Recent advances in molecular biology, however, have broken down many of the barriers between functional and evolutionary inquiry, opening the door to detailed studies of the genetic basis of functional trait evolution in plants. In this article, we review the insights into plant evolution that have been provided by molecular methods and address future research needs. Quantitative trait locus (QTL) mapping in crop and model plants has shown that individual loci often have large effects on trait variation, at variance with the micromutationist perspective. Evidence so far indicates that QTLs with large effects are also important in wild populations, underlying interspecific differences as well as intraspecific variation. Isolation of some of these QTLs, in particular for flowering time variation, has revealed a prominent role for regulatory genes known to function in regulation of flowering and exposed the complexity of regulatory processes. Preliminary evidence indicates that plant growth variation may be directly regulated rather than primarily the indirect result of selection on constituent processes. Future research should expand the number of traits that are intensively studied and make greater use of QTL mapping in wild plant taxa, especially those undergoing adaptive radiations, while continuing to draw on insights from model plants. Promising techniques include testing of candidate gene-trait associations in wild populations, genetic mapping in hybrid zones, and microarray analyses of gene expression.

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Genetics and Morphological Evolution in Plants

Cited by 360 publications

References 88 publications

Variation and intraspecies classification of edible canna (Canna indica L.) based on morphological characters

Variation and intraspecies classification of edible canna (Canna indica L.) based on morphological characters

Plant hybridization

Candidate Genes, Quantitative Trait Loci, and Functional Trait Evolution in Plants

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