The introgression of characters of the wild oat Avena magna (2n=4x=28) into the cultivated oat A. sativa (2n=6x=42)

Thomas, Hugh; Haki, J. M.; Arangzeb, S.

doi:10.1007/bf00025138

“…In the last hybridization cycle (4th crossing cycle), we managed to harvest the BC4 seeds, which were analyzed for their chromosome number, pollen stainability, seed set, and seed morphological characterization. Analysis of correlations between the chromosome number and the other quantitative characters confirmed the results reported by Hugh et al (1980), that no correlation exists between 2n and PF. Morphological characterization of derivative hybrid seeds showed that lemma color segregated in all combinations as a single gene, while the other characters deviated significantly from the 3:1 ratio for most of the combinations, thus confirming what was demonstrated by Marshall and Shanner (1992), that the four spikelet characteristics are linked to one another in the common oat.…”

Section: Resultssupporting

confidence: 82%

Domestication of <i>Avena magna</i> Murphy et Terrell: a wild tetraploid oat species endemic of Morocco

Saïdi

¹

,

Shaimi

²

,

Идрисси

³

et al. 2020

Trudy po prikladnoy botanike, genetike i selektsii

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Avena magna Murphy et Terrell (2n = 4x = 28), a tetraploid oat species endemic of Morocco, has a high groat protein content (more than 20%), good resistance to diseases and good adaptability to the Mediterranean edaphic and climate conditions. Moreover, this taxon is morphologically similar to the hexaploid oat species A. sativa and promising for interspecific crosses with A. sativa in order to transfer the domestication syndrome into it. Four hybridization cycles employing four accessions of A. magna and five Moroccan hexaploid oat cultivars of A. sativa were accomplished to domesticate A. magna. Morphological characterization and cytogenetic analysis of derivative hybrid seeds were made to determine their ploidy level and select the seeds with 2n = 28. The overall combinations yielded 81 hybrid plants with 2n varying from 28 to 29, with 58% having 2n = 28, and pollen fertility over 85%. However, 27 hybrids yielded a seed set ranging from 20 to 80%. Selected hybrid plants were subjected to pedigree selection in the field until they reached the 8th generation and assessed for agronomic performance. Three domesticated lines of tetraploid oat A. magna were selected for their good disease resistance. Analysis of groat protein content in the selected hybrids using the Kjeldahl method showed that it was 2 to 3% higher than in their parents.

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“…Cox (1979) evaluated a diallel mating among elite high protein lines and found that the lines derived from backcrosses with A. sterilis had higher percentages of transgressive progeny when mated with A. sativa lines than did matings among pure A. sativa lines. In a study of introgression derivatives of A. sativa x A. magna, Thomas et al (1980) found that it was possible to select lines which exceeded the A. sativa parent in protein percentage without having the undesirable seed characteristics of the wild parent.…”

Section: Probably the Earliest Evidence Of Increased Yield Potential mentioning

confidence: 99%

Improvement of cultivated barley (Hordeum vulgare) with germplasm introgressed from H spontaneum

¹

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This was produced from a copy of a document sent to us for microfilming. While the most advanced technological means to photograph and reproduce this document have been used, the quality is heavily dependent upon the quality of the material submitted. The following explanation of techniques is provided to help you understand markings or notations which may appear on this reproduction. 1.The sign or "target" for pages apparently lacking from the document photographed is "Missing Page(s)". If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting through an image and duplicating adjacent pages to assure you of complete continuity. 42 Means of the H. vulgare parents, H. vulgare histori cal checks, and the H. spontaneum parents for grain yield, biomass, straw yield, height, heading date, harvest index and growth rate index 46

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“…Substantial genetic improvement has been made in oats (A. sativa) using alleles from its wild relative A. sterilis. Perhaps because of the magnitude of sucess which has been achieved with A. sterilis, the genetic potential of several other wild oat relatives has received recent attention (Rines et al, 1980;Thomas et al-, 1980).…”

Section: Oatsmentioning

confidence: 99%

Improvement of cultivated barley (Hordeum vulgare) with germplasm introgressed from H spontaneum

¹

View full text Add to dashboard Cite

This was produced from a copy of a document sent to us for microfilming. While the most advanced technological means to photograph and reproduce this document have been used, the quality is heavily dependent upon the quality of the material submitted. The following explanation of techniques is provided to help you understand markings or notations which may appear on this reproduction. 1.The sign or "target" for pages apparently lacking from the document photographed is "Missing Page(s)". If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting through an image and duplicating adjacent pages to assure you of complete continuity. 42 Means of the H. vulgare parents, H. vulgare histori cal checks, and the H. spontaneum parents for grain yield, biomass, straw yield, height, heading date, harvest index and growth rate index 46

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The introgression of characters of the wild oat Avena magna (2n=4x=28) into the cultivated oat A. sativa (2n=6x=42)

Cited by 20 publications

References 9 publications

Domestication of <i>Avena magna</i> Murphy et Terrell: a wild tetraploid oat species endemic of Morocco

Domestication of <i>Avena magna</i> Murphy et Terrell: a wild tetraploid oat species endemic of Morocco

Improvement of cultivated barley (Hordeum vulgare) with germplasm introgressed from H spontaneum

Improvement of cultivated barley (Hordeum vulgare) with germplasm introgressed from H spontaneum

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