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Genetic characterization of spontaneous diploid androgenetic wheat and triticale plants (2002)

Muranty, H. ; Sourdille, P. ; Bernard, S. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Plant breeding 121 (2002), S. 0

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ISSN: 1439-0523

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: The homozygosity of spontaneous hexaploid plants derived from anther culture was evaluated in wheat and triticale by means of 18 and 22 microsatellite markers, respectively. Most of the spontaneous hexaploid plants were homozygous for all the loci tested and had chromosomes recombining for parental alleles. Only 12% of the spontaneous hexaploid wheat plants, 11% of the artificially doubled wheat plants and 4.4% of the spontaneous hexaploid triticale plants were heterozygous at one to three of the loci studied. This showed that spontaneous hexaploid plants mostly came from normal haploid cells, obtained after meiosis, that underwent spontaneous chromosome doubling. However, first or second division restitution, producing unreduced gametes, cannot be completely excluded to explain the origin of the spontaneous hexaploid plants. Cytomixis, involving only one chromosome, or development of aneuploid trisomic gametes, followed by chromosome doubling for the spontaneous hexaploid plants, or transposition events could also explain some of the results obtained.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1046/j.1439-0523.2002.00759.x

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Inheritance of resistance of wheat to eyespot at the adult stage (2002)

Muranty, H. ; Jahier, J. ; Tanguy, A.-M. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Plant breeding 121 (2002), S. 0

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ISSN: 1439-0523

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Moderate resistance to eyespot was first incorporated in the variety Cappelle-Desprez (CD). Later the gene Pch1, which could confer a higher level of resistance, was introduced from Aegilops ventricosa. However Pch1-carrying varieties can sustain significant eyespot-induced yield losses in severe attack situations. A strategy to further enhance the resistance of wheat is by pyramiding Pch1 and the genes for resistance in CD. The first requirement to achieve this is a better understanding of the genetics of resistance in CD. The resistance of the 21 Cappelle-Desprez (Bezostaya) disomic substitution lines was evaluated. Chromosome 7A was confirmed as carrying a major gene for resistance to eyespot at the seedling stage. However, this study demonstrates that this chromosome has no effects at the adult stage. Chromosome 5A was shown to carry a major gene for resistance to eyespot at the adult stage, which was stably expressed each year of testing. Chromosomes 1A and 2B had significant effects for only two years among four.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1046/j.1439-0523.2002.00767.x

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