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Cytology and Morphology of Elymus hoffmanni (Poaceae: Triticeae): A New Species from the Erzurum Province of Turkey

K. B. Jensen and K. H. Asay
International Journal of Plant Sciences
Vol. 157, No. 6 (Nov., 1996), pp. 750-758
Stable URL: http://www.jstor.org/stable/2474889
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Cytology and Morphology of Elymus hoffmanni (Poaceae: Triticeae): A New Species from the Erzurum Province of Turkey
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Abstract

Cytological and morphological characteristics of a proposed new species, Elymus hoffmanni Jensen & Asay, are described. This species is cytologically stable and is genomically similar to Elymus repens (L.) Gould (SSSSHH) (= Agropyron repens [L.] P. Beauv and Elytrigia repens [L.] Nevski) and the cultivar NewHy (SSSSHH), but morphologically different from E. repens. Elymus hoffmanni has longer leaves, shorter awns on the glumes, and less rhizome development, and it is taller than the cultivar NewHy. Elymus hoffmanni was crossed with E. repens and the cultivar NewHy hybrid wheatgrass (2n = 6x = 42). A natural hybrid between E. hoffmanni and the cultivar Hycrest crested wheatgrass (2n = 4x = 28, PPPP) was identified from open-pollinated progeny of E. hoffmanni. Meiosis of E. hoffmanni was characterized as an autoallohexaploids with a mean chromosome association of 1.63 I + 17.87 II + 0.35 III + 0.67 IV + 0.04 V per cell. Mean chromosome associations were 1.88 I + 19.12 II + 0.16 III 0.46 + IV per cell in the hybrids of E. repens x E. hoffmanni, 1.63 I + 19.43 II + 0.22 III + 0.31 IV + 0.01 V per cell in NewHy x E. hoffmanni hybrids, and 9.22 I + 12.74 II + 0.40 III + 0.02 IV in E. hoffmanni x Hycrest hybrids. Based on chromosome pairing in hybrids with E. repens and NewHy and its morphological uniqueness from E. repens, we propose E. hoffmanni as a new species originating from a primitive hybrid between E. repens and the bluebunch wheatgrasses (Pseudoroegneria spp.) of Turkey.

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