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Type: Journal article
Title: Hybrids of Avena sativa with two diploid wild oats (CIav6956) and (CIav7233) resistant to crown rust
Author: Aung, T.
Zwer, P.
Park, R.
Davies, P.
Sidhu, P.
Dundas, I.
Citation: Euphytica, 2010; 174(2):189-198
Publisher: Kluwer Academic Publ
Issue Date: 2010
ISSN: 0014-2336
Statement of
Taing Aung, Pamela Zwer, Robert Park, Philip Davies, Parminder Sidhu and Ian Dundas
Abstract: Two diploid accessions of wild oat, CIav6956 and CIav7233, were identified as carrying seedling resistance to oat crown rust (caused by Puccinia coronata f. sp. avenae; Pca). Two vigorous interploidy F1 hybrids were generated from crosses involving the hexaploid oat cultivar Wintaroo and the diploid oat Avena strigosa Schreb. accession CIav6956. An additional interploidy F1 hybrid, designated “F1-Aa1”, was produced from a cross of Wintaroo and the diploid oat accession CIav7233. All three hybrids were more vigorous and taller than the cultivated parent Wintaroo. The three F1 hybrids contained full chromosome complements from both parents (2n = 4x = 28), but no seeds were obtained when the three F1 hybrids were selfed. Meiotic analyses of the hybrids indicated that they exhibited a high degree of inter-genome and intra-genome pairing. Trivalent configurations were detected in 95–96% of meiotic cells and a minimum of three bivalents was present in all cells. An average chiasma frequency of 7.2–7.9 per cell was observed for the three F1 hybrids. A fourth F1 hybrid was subsequently generated from a cross between the diploid oat accession CIav7233 and Wintaroo. One octaploid (2n = 8x = 56) was generated from this hybrid and progeny were resistant to two Pca races. The chromosome number of the octaploid progeny varied between 51 and 54 chromosomes. Development of a chromosome addition line(s) with the crown rust resistance should be possible from these partial-octaploids.
Keywords: Resistance; Partial-octaploids; Chromosome pairing; Meiosis
Description: The original publication is available at
Rights: © Springer Science+Business Media B.V. 2010
RMID: 0020100065
DOI: 10.1007/s10681-009-0111-5
Appears in Collections:Agriculture, Food and Wine publications

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