Isolating mechanisms and implications for modes of speciation in Heliantheae (Compositae)

Sundberg, Scott; Stuessy, Tod F.

doi:10.1007/978-3-7091-6928-5_5

Cited by 6 publications

(8 citation statements)

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“…This has been suggested as being prevalent in tribe Heliantheae (Sundberg and Stuessy, 1990), and it has been shown to be so in other tribes as well (e.g., Crepis, Lactuceae;Babcock, 1947). The basic idea is that populational systems become partitioned slowly through time, perhaps in response to geographic barriers such as mountain building, volcanic activity, stream and canyon development, etc.…”

Section: Speciationmentioning

confidence: 93%

“…The hybrid is also reproductively isolated from the parents. This has been a common mode of speciation in Asteraceae as documented by numerous examples: Ownbey (1950);Solbrig (1977);Grant (1981); Soltis and Soltis (1989);Sundberg and Stuessy (1990). Until recently, it was believed that the evolutionary import of allopolyploidy was vastly greater than autopolyploidy (e.g., Stebbins, 1971).…”

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confidence: 95%

“…Differences in chromosome number between closely related species usually reflect reproductive barriers between them. As a result, such taxa may be at least partially sympatric with no viable hybrids observed (see Sundberg and Stuessy, 1990, for examples in Heliantheae). If closely related taxa occur at the same chromosomal level, however, the potential for hybridization is greater, although by no means certain because of all the other pre-or postzygotic isolating mechanisms that may be operative.…”

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Flavonoids of the Sunflower Family (Asteraceae)

Bohm

Stuessy

2001

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This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machines or similar means, and storage in data banks. This book is dedicated to:Arthur Cronquist Outstanding plant systematist and major contributor to understanding taxonomic relationships within Asteraceae and Ralph E. Alston (1925Alston ( -1967) Visionary natural products chemist and geneticist who pioneered the use of chemical data in studies of plant systematics and evolution PrefaceCertainly many of the readers of this book will remember the early developments of chemosystematics in the late 1950s. We ourselves remember the excitement of these new data bearing on plant interrelationships. The hopes were high, the techniques were rapidly evolving, the quantities of data were large, and young workers were eagerly enthusiastic. Some even went so far as to predict that chemical data would soon replace morphological information as the basis for plant classification. These overly zealous predictions did not materialize, of course, as the history of plant systematics has amply shown during the past two centuries. If there is any distinct characteristic of systematics it is synthesis, as Lincoln Constance (1964) called it, the "unending synthesis." New tools generate new data and provide insights on additional dimensions of plant relationships. This will never change-we will continue to discover new tools and new data in the years ahead, and they will continue to be incorporated into the predictive general reference system of classification.The earlier efforts in chemosystematics focused on secondary plant products: alkaloids, betacyanins, carbohydrates, cyanogenic glycosides, glucosinolates, lipids, terpenoids, and especialiy flavonoids. The latter were particularly well suited for chemosystematic investigation for several reasons: ease of isolation and characterization, small amounts of plant material needed for analysis, stability of compounds especially through routine preparation of herbarium specimens, and low cost to obtain useful information. As a result of these considerable advantages, literally thousands of studies on use of flavonoids in plant systematics have been published. Although now with the present zest for macromolecular data from DNA restriction sites and sequences, there are fewer workers and laboratories dedicated to flavonoid chemosystematic studies; twenty years ago they were the new currency of exciting data in plant systematics.Because of many workers historically interested in the sunflower family, Asteraceae (or Compositae), in part due to its large size (approximately 23,000 species;Bremer, 1994), and because hundreds of flavonoid compounds were discovered in this family, many chemosystematic investigations have been completed on various taxa. Many studies came from the laboratories of R. A. Alston, B. L. Turner, and T. J. Mabry in the Department of Botany ...

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Section: Speciationmentioning

confidence: 93%

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confidence: 95%

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Flavonoids of the Sunflower Family (Asteraceae)

Bohm

Stuessy

2001

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“…With the exception of M. strigosum and M. pringlei, the allopolyploids and their putative parental taxa have at least partially overlapping distribution areas (Fig. S2), and they mostly occur in xerophytic pine-oak woodlands (Stuessy 1972;Sundberg and Stuessy 1990).…”

Section: Inference Of Allopolyploid Parentagementioning

confidence: 99%

The Promiscuous and the Chaste: Frequent Allopolyploid Speciation and Its Genomic Consequences in American Daisies (Melampodium sect. melampodium; Asteraceae)

et al. 2011

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Polyploidy, an important factor in eukaryotic evolution, is especially abundant in angiosperms, where it often acts in concert with hybridization to produce allopolyploids. The application of molecular phylogenetic techniques has identified the origins of numerous allopolyploids, but little is known on genomic and chromosomal consequences of allopolyploidization, despite their important role in conferring divergence of allopolyploids from their parental species. Here, using several plastid and nuclear sequence markers, we clarify the origin of tetra-and hexaploids in a group of American daisies, allowing characterization of genome dynamics in polyploids compared to their diploid ancestors. All polyploid species are allopolyploids. Among the four diploid gene pools, the propensity for allopolyploidization is unevenly distributed phylogenetically with a few species apparently more prone to participate, but the underlying causes remain unclear. Polyploid genomes are characterized by differential loss of ribosomal DNA loci (5S and 35S rDNA), known hotspots of chromosomal evolution, but show genome size additivity, suggesting limited changes beyond those affecting rDNA loci or the presence of processes counterbalancing genome reduction. Patterns of rDNA sequence conversion and provenance of the lost loci are highly idiosyncratic and differ even between allopolyploids of identical parentage, indicating that allopolyploids deriving from the same lower-ploid parental species can follow different evolutionary trajectories.

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“…That is, the monographer must take every opportunity to provide syntheses of information for the maximum number of intelligent hypotheses that will stimulate additional work on the group. For example, simple information regarding distribution, relationships, flowering times and chromosome numbers can suggest hypotheses on modes of speciation within the group (e.g., Sundberg & Stuessy, 1990). In fact, one can argue that it is the responsibility and obligation of the monographer to provide these creative syntheses.…”

Section: The Structure and Content Oftaxonomic Monographsmentioning

confidence: 99%

The role of creative monography in the biodiversity crisis

Stuessy

1993

TAXON

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Stuessy, T. F.: The role of creative monography in the biodiversity crisis.. -Taxon 42: 313-321. 1993. -ISSN 0040-0262.The increasing size and activities of the human population have resulted in pressure on the survival of other life forms. In the face of extinction of many of these organisms, we need to learn as much about them as quickly as possible. One level of understanding can be achieved through monographic studies, which contain basic descriptive information about organisms and their distributions. Monographs also contain predictive classifications and usually also evolutionary and biogeographic hypotheses for use by systematic biologists and society in general. The current rate of disappearance of the world's biota suggests need for increased -levels of creative monographic activity. Funding for botanical monography in the United States, however, is declining, and fewer graduate students are being trained with these interests and skills. Large-scale monographic projects with established workers and postdoctoral associates together focusing on large taxa (i.e., 50-100 species) are advocated as one solution to the problem.

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Isolating mechanisms and implications for modes of speciation in Heliantheae (Compositae)

Cited by 6 publications

References 85 publications

Flavonoids of the Sunflower Family (Asteraceae)

Flavonoids of the Sunflower Family (Asteraceae)

The Promiscuous and the Chaste: Frequent Allopolyploid Speciation and Its Genomic Consequences in American Daisies (Melampodium sect. melampodium; Asteraceae)

The role of creative monography in the biodiversity crisis

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