Germination and growth characteristics of five accessions of jointed goatgrass (Aegilops cylindrica) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/qj72pc244

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  • Laboratory and field studies were conducted at Pendleton, Oregon, during 1983 and 1984 to evaluate germination and growth characteristics of five jointed goatgrass (Aegilops cylindrica Host) accessions collected from sites in Echo, Ione, Pendleton, Condon, and Elgin, Oregon. Spikelets were germinated for 27 days at room (23 +̲ 2 C) and constant (7, 18, 23, 29, and 38 C) temperatures after storage for 0 to 12 months. The germination pattern for jointed goatgrass spikelets was similar for all accessions. Highest germination occurred at either 18 or 23 C for all storage lengths, except for 12-months-old spikelets, which germinated best at 29 C. Freshly harvested spikelets (0-months-old) were predominantly dormant at high temperatures, but some germination occurred at lower temperatures (7 and 18 C). As storage time increased, spikelets afterripened (lost their dormancy) and gained the ability to respond to a wider range of temperatures. At the same time, germination rate and percentage generally increased as the temperature was raised from 7 to 29 C. No germination occurred at 38 C. Emergence and flowering times in the field were similar for all accessions. Jointed goatgrass from Condon was significantly taller and produced fewer spikelets per spike than the other accessions. Spikelet yield and stand counts differed among accessions, but this may have been due to spikelet quality differences at planting. No significant differences were observed for leaf and stem dry weight, spikes per plant, and spikelets per plant. Data suggest that the five jointed goatgrass accessions may be genetically similar, thus control programs may not need to be site specific. Definite conclusions on genetic similarity must await second-generation studies of plants grown from seed produced under the same environmental conditions.
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  • File scanned at 300 ppi (Monochrome) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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