A biosystematic study of selected species within the genus Elymus L. (Poaceae: Triticeae) /
| Main Author: | |
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| Other Authors: | , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1988.
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| Subjects: | |
| Online Access: | ProQuest, Abstract Link to OAKTrust copy |
| Abstract: | Elymus abolinii (Drob.) Tzvelev, E. gemilinii (Ledeb.) Tzvelev, E. pendulinus (Nevski) Tzvelev, E. parviglume (Keng) A. Love, E. semicostatus (Nees ex Steud.) A. Love spp. foliosis (Keng) A. Love, E. strictus (Keng) A. Love, and E. pendulinus (Nevski) Tzvelev spp. multiculmis were studied to determine; (1) their reproductive characteristics; (2) their genomic constitution; (3) the morphological and anatomical variation, (4) phylogenetic relationships; and (5) taxonomic delimitations. All species are tetraploids (2n=28) behaving as strict alloploids with the same genomic formula and are self-fertile. Hybrids were obtained between the above mentioned species and the following "analyzer species" with known genomic formulas: Pseudoroegneria spicata (Pursh) A. Love, 2n=14, SS; P. stipifolia (Czern. ex Nevski) A. Love, 2n=14; Elymus canadensis L., 2n=28, SSHH; E. lanceolatus (Scribn. & Smith) Gould, 2n=28, SSHH; E. trachycaulus (Link) Gould ex Shinners, 2n=28; SSHH; E. dentatus (Hook. f.) Tzvelev ssp. ugamicus (Drob.) Tzvelev, 2n=28, SSYY; E. yezoensis Honda, 2n=28, SSYY; E. drobovii (Nevski) Tzvelev, 2n=42, SSHHYY. Chromosome pairing in this series of hybrids demonstrated that the species under study contain the S and Y genomes. Anatomical characters of both leaf epidermis and leaf transverse sections were observed. Features of the adaxial and abaxial epidermis were similar in most characters. Variation was observed in the adaxial intercostal long cells with the degree of wall undulation, and the lack of the stomatal complexes on the abaxial surface. Elymus pendulinus, E. pendulinus ssp. multiculmis and E. parviglume all possessed smooth to nearly smooth adaxial intercostal long cell wall margins, and greatly reduced to lacking stomatal complexes. Leaf anatomy was of the typical C3 type, with variation found in bulliform cell shapes and the presence of an outer bundle sheath in E. abolinii and E. gmelinii, which is lacking in the remainder of the taxa. Morphological variation of 52 characters was examined in seven groups totaling 103 operational taxonomic units (OTU's), using principle components analysis and clustering. Based on these studies four species are recognized. Evidence strongly suggests that E. pendulinus and E. pendulinus ssp. multiculmis be recognized as E. pendulinus (Nevski) Tzvelev, and that E. strictus be reduced to a subspecies of E. gmelinii. The remainder of the taxa will remain as currently treated in Elymus. |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Plant Breeding." |
| Physical Description: | xiii, 184 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references (leaves 161-169). |