المؤلفون: Rasul, Golam^1,2,3 (AUTHOR), Humphreys, Gavin D.¹ (AUTHOR), Wu, Jixiang² (AUTHOR), Brûlé‐Babel, Anita⁴ (AUTHOR), Fofana, Bourlaye⁵ (AUTHOR), Glover, Karl D.² (AUTHOR)

المصدر: Plant Breeding. Apr2012, Vol. 131 Issue 2, p244-251. 8p. 10 Charts.

مصطلحات موضوعية: *PREHARVEST sprouting of corn, *PLANT germplasm, *GENOTYPE-environment interaction, *WHEAT products, *GENE expression in plants

مصطلحات جغرافية: MANITOBA, CANADA

مستخلص: With 10 tables Abstract Preharvest sprouting (PHS) can greatly affect the consistent production of high-quality spring wheat ( Triticum aestivum L.) in many regions worldwide including Western Canada. A worldwide collection of red- and white-seeded spring wheat genotypes with different levels of sprouting response were characterized for three PHS traits: falling number, germination index and sprouting index in three different environments in Manitoba, Canada. The data sets were analysed by the genotype and genotype × environment interaction model. Variance components were estimated, genotypic and their interaction effects with environments were predicted by using one of mixed linear model approaches: minimum norm quadratic unbiased estimation approach. Genotypic variance expressed as proportion to the phenotypic variance was higher compared to genotype × environment (G × E) interaction effects for all three PHS traits, suggesting that these genotypes can be used to develop high level of PHS-resistant cultivars regardless of environment. Strong correlations between PHS traits across environments suggest that all three traits are repeatable and reliable methods to determine PHS response in spring wheat depending on sample types (spike, grain or flour). Predicted genotypic effects, G × E interaction effects and the linear discriminant analysis revealed that white-seeded genotypes 'AUS1408', 'SC8019-R1' and Kanata, and red-seeded genotypes 'AC Domain', 'AC Majestic' and 'Red RL4137' would be useful PHS-resistant donors in spring wheat cultivar development programmes. [ABSTRACT FROM AUTHOR]

المؤلفون: DePauw, R.¹ Depauw@AGR.GC.CA, Clarke, F.¹, Fofana, B.², Knox, R.¹, Humphreys, G.³, Cloutier, S.³

المصدر: Euphytica. Aug2009, Vol. 168 Issue 3, p347-361. 15p. 1 Diagram, 10 Charts.

مصطلحات موضوعية: *PREHARVEST sprouting of corn, *WHEAT, *GRAIN, *SEED viability, LOSSES

مصطلحات جغرافية: CANADA

مستخلص: Preharvest sprouting (PHS) in spring wheat ( Triticum aestivum L.) causes significant economic losses due to a reduction in grain functionality, grain yield and viability of seed for planting. Genetic resistance to PHS reduces these losses. Development of PHS resistant cultivars is complicated by the effects of genotype, environment, kernel diseases and spike morphological factors. RL4137 has consistently exhibited high levels of resistance to PHS over years and environments. The mean PHS scores of Canada Western Red Spring (CWRS) wheat cultivars with RL4137 in their ancestry are lower than that of CWRS wheat cultivars without. RL4137 has two mechanisms for PHS resistance, one associated with kernel color and the other not associated with kernel color. RL4137 was the source of PHS resistance in white wheats HY361, AC Vista, Snowbird, Kanata, and Snowstar, all of which had significantly lower PHS scores than the white-seeded check, Genesis. Known DNA markers relating to PHS were used to compare haplotypes with and without RL4137 in the ancestry. Coefficients of parentage also demonstrated the relationship. Because cultivars that have RL4137 in their ancestry were grown on about 77% of the spring wheat area for 2003–2007, RL4137 continues to contribute to protecting market grade from preharvest sprouting. [ABSTRACT FROM AUTHOR]