Natural and Synthetic Hybrids of Agropyron spicatum x Sitanion hystrix

Dewey, Douglas R.

doi:10.2307/2483432

Cited by 14 publications

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“…and Smith) Piper, derived from hybridization with bluebunch wheatgrass, were also included in Hitchcock's 1950 manual. Both S. hanseni (Stebbins et al 1946) and A. saxicola (Dewey 1964) have been genetically characterized and their hybrid origins confirmed by comparison of artificial hybrids with natural specimens.…”

Section: Wilson (1963) Recognized Sitanion Was Not Distinct Frommentioning

confidence: 93%

“…For example, the single bluebunch wheatgrass [Pseudoroegneria spicata (Pursh) A. Love] St genome may pair with the homologous genome of squirreltail (Dewey 1964) and the single Hordeum bogdanii Wilensky H genome (Dewey 1971 Smith; or multi-cleft glumes as in S. hystrix var. hystrix or, to the extreme, S. jubatum.…”

Section: Wilson (1963) Recognized Sitanion Was Not Distinct Frommentioning

confidence: 99%

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Viewpoint: The Present Status and Future Prospects of Squirreltail Research

Jones¹

1998

Journal of Range Management

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Section: Wilson (1963) Recognized Sitanion Was Not Distinct Frommentioning

confidence: 93%

Section: Wilson (1963) Recognized Sitanion Was Not Distinct Frommentioning

confidence: 99%

Viewpoint: The Present Status and Future Prospects of Squirreltail Research

Jones¹

1998

Journal of Range Management

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“…This is because results should reflect the relationships of more than one or but a few species. It is surprising (at least to me) that wide species-crosses are possible in a diverse group of angiosperms (e.g., Bates and Deyoe, 1973;Chambers, 1955;Clausen, 1962;Dejong, 1965;Dewey, 1964;Harberd and McArthur, 1980;Heiser, 1963;Heiser et al, 1979;Jenkins, 1939;Jones, 1976;Kruckeberg, 1962;Longpre, 1970;McGregor, 1968;Mitsuoka and Ehrendorfer, 1972;Olorode, 1970;Olorode and Torres, 1970;Ornduff, 1966;Pinkava, 1967;Powell, I972a, 1978;Raven, 1980;Smith, 1965;Torres, 1964). Successful experimental crosses are to be expected, especially when allopatric, outcrossing, perennial taxa, or K-selected species, are involved (Stebbins, 1950;Grant, 1971;Gadgil and Solbrig, 1972;Raven, 1976;Powell, 1978;Raven, 1980), as opposed to annuals or r-selected species which often have strong internal reproductive barriers.…”

Section: The Peritylinae and Flaveriinae Examplementioning

confidence: 99%

Crossing Data as Generic Criteria in the Asteraceae

Powell

1985

TAXON

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. International Association for Plant Taxonomy (IAPT) is collaborating with JSTOR to digitize, preserve and extend access to Taxon. SummaryCrossing data have long been used to help determine the position of species whose generic status is questionable, to help define subgeneric taxa, to merge genera, and, in a limited number of studies, to help establish generic boundaries. Previous studies in the subtribes Peritylinae and Flaveriinae (Helenieae) have demonstrated that crossing data can be employed as a major approach in delimiting generic entities and in establishing relationships between genera. In fact, in the above taxa crossing data proved to be more useful at the genus level than at the species level. Such crossing tests can be employed at optimum only if it is possible to produce hybrids between most of the species in the putative genera concerned. It does appear that it is often possible to obtain comprehensive data from artificial interspecific hybridizations, especially when allopatric perennial taxa are involved. The interpretation of crossing data may present problems because variable interfertility values in different taxa are to be expected, and independent taxonomic judgements must be made in context with information from other approaches. In the tribe Eupatorieae, where extensive generic reorganization has been proposed in recent years, hybridization tests may be possible in some groups (Carterothamnus x Hofmeisteria; Koanophyllon x Pseudokyrsteniopsis) but not in others (Brickellia).If a group of species can be crossed successfully among themselves (i.e., if F, hybrids can be examined for fertility) then artificial hybridization provides a good method for the delineation of genera especially when used in context with data from other approaches. In fact, in many groups, crossing data may be more useful at the genus level than at the species level.Crossing data have been used to help determine the generic position of species whose status is questionable (Arnold and Jacksonand for yet other purposes. A strong theme to be derived from the studies cited is that artificial hybridizations are appropriate for widespread and general use in the Asteraceae as a methodological approach to the generic problem. The Peritylinae and Flaveriinae ExamplePrevious studies in the subtribes Peritylinae and Flaveriinae provide an example of how crossing data can be employed as a major approach in delimiting genera and in establishing relationships between genera (Powell, 1969(Powell, , 1972a(Powell, , 1972c(Powell, , 1973(Powell, , 1974(Powell, , 1978. In the Peritylinae, crossing data weighed heavily in the eventual recognition of three traditional genera (Pappothrix, Laphamia, Per...

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“…hystrix and A . spicatum (Dewey, 1964). The two hybrids: could be easilv confused were it not for the · short rhizomes of A. albieans X A. hystrix hybrids.…”

mentioning

confidence: 99%

“…Cytology-The cytology of A. dasystachyum, S. hystrix, and E. canadensis has been studied in -detail previously (Dewey, .1964(Dewey, . , 1965(Dewey, .…”

mentioning

confidence: 99%

Synthetic Hybrids of Agropyron Albicans X A. Dasystachyum, Sitanion Hystrix, and Elymus Canadensis

Dewey

1969

American J of Botany

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Emasculated crosses of Agropyron albicans Scribn. & Smith with A. dasystachyum (Hook.) Scribn., Sitanion hystrix (Nutt.) J. G. Smith, and Elymus canadensis L. yielded 34, 5, and 9 viable hybrid seeds from 66, 45, and 52 florets, respectively. The hybrids were for the most part morphologically intermediate between their respective parents. The parents behaved cytologically as allotetraploids, 2n = 28; but meiosis in A. albicans was somewhat more irregular than in the other three species. Chromosome pairing was good in all hybrids and indicated that the genomes of the parent species were closely homologous, but only the A. albicans × A. dasystachyum hybrids set seed. Although closely related, A. albicans and A. dasystachyum are not fully conspecific. Agropyron albicans was considered to be a subspecies of A. dasystachyum, as were A. riparium Scribn. & Smith and A. griffithsii Scribn. & Smith ex Piper.

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Natural and Synthetic Hybrids of Agropyron spicatum x Sitanion hystrix

Cited by 14 publications

References 0 publications

Viewpoint: The Present Status and Future Prospects of Squirreltail Research

Viewpoint: The Present Status and Future Prospects of Squirreltail Research

Crossing Data as Generic Criteria in the Asteraceae

Synthetic Hybrids of Agropyron Albicans X A. Dasystachyum, Sitanion Hystrix, and Elymus Canadensis

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