2011. Nitrogen remobilization and post-anthesis nitrogen uptake in relation to elevated grain protein concentration in durum wheat. Can. J. Plant Sci. 91: 273Á282. Grain protein concentration is an important end-use suitability factor in durum wheat [Triticum turgidum L. ssp. durum (Desf.)Husn.] through its effect on cooking quality. Genetic differences in grain protein concentration are exploited in Canadian durum breeding programs, but the physiological basis of these differences remains unknown. Eighteen durum genotypes varying in grain protein concentration were grown at three pre-selected Saskatchewan locations that differ for soil nitrogen (N). These included check cultivars and six low-and six high-protein doubled haploid (DH) selections from the cross DT695)Strongfield (low-by high-protein). Plants were sampled at the anthesis, milk, dough and physiological maturity developmental stages, and dry matter and N concentration of plant parts were determined. The high-protein selections expressed 0.6 to 1.1 percentage units higher grain protein concentration than the low selections over the three environments (PB0.05), but yielded less grain than the low selections in two of the three environments. Remobilization of N from vegetative organs to grain varied with environment and accounted for 73 to 98% of grain N, the remainder made up from post-anthesis N uptake. The high-protein selections showed greater post-anthesis N uptake than the low selections in two of three environments (P B0.01), but lower N remobilization from vegetative organs to the grain than the low selections in the same environments (PB0.05). Subtle differences in N and dry matter partitioning accounted for the observed differences in grain protein concentration. Suprayogi, Y., Clarke, J. M., Bueckert, R., Clarke, F. R. et Pozniak, C. J. 2011. La remobilisation de l'azote et l'absorption d'azote apre`s l'anthe`se, et leurs liens avec la concentration e´leve´e de prote´ines dans le grain du ble´dur. Can. J. Plant Sci. 91: 273Á282. La concentration de prote´ines dans le grain joue un roˆle important dans l'utilite´du ble´dur (Triticum turgidum L.ssp. durum (Desf.) Husn.), ce facteur affectant la qualite´a`la cuisson. Les programmes d'hybridation canadiens exploitent la variation ge´ne´tique de la concentration de prote´ines dans le grain, mais on ignore l'origine physiologique des e´carts observe´s. Les auteurs ont cultive´dix-huit ge´notypes de ble´dur a`concentration de prote´ines variable dans le grain. Les essais se sont de´roule´s a`trois endroits de la Saskatchewan, pre´se´lectionne´s en raison d'une teneur en azote (N) variable dans le sol. Les ge´notypes incluaient des cultivars te´moins et six doubles haploı¨des a`faible ou a`forte teneur en prote´ines issus du croisement DT695)Strongfield (varie´te´a`faible teneur en prote´ines avec varie´te´a`forte teneur en prote´ines). Les plants ont e´te´e´chantillonne´s a`l'anthe`se, au stade du grain laiteux, au stade paˆteux et a`la maturite´physiologique, et les auteurs ont de´termine´la quantit...
DePauw, R. M., Knox, R. E., McCaig, T. N., Clarke, F. R. and Clarke, J. M. 2011. Muchmorehard red spring wheat. Can. J. Plant Sci. 91: 797–803. Based on 36 replicated trials over 3 yr, Muchmore, a doubled haploid hard red spring wheat (Triticum aestivum L.), averaged up to 20% more grain yield than the checks. It matured significantly later than AC Barrie, Katepwa and Lillian. Muchmore was significantly shorter than all of the checks and was significantly more resistant to lodging than Katepwa, Laura and Lillian. Muchmore had significantly higher test weight than Katepwa and Lillian, intermediate kernel weight relative to the checks, and meets the end-use quality specifications of the Canada Western Red Spring wheat market class. Muchmore expressed resistance to prevalent races of leaf rust, stem rust and common bunt, moderate resistance to loose smut, and moderate susceptibility to fusarium head blight.
Singh, A. K, Clarke, J. M., Knox, R. E., DePauw, R. M., Wise, I., Thomas, J., McCaig, T. N., Cuthbert, R. D., Clarke, F. R. and Fernandez, M.R. 2015. AAC Marchwell durum wheat. Can. J. Plant Sci. 95: 189–195. AAC Marchwell durum wheat [Triticum turgidum L. subsp. durum (Desf.) Husn.] is adapted to the durum production area of th Canadian prairies. AAC Marchwell is the first durum genotype registered for commercial production in Canada with the Sm1 gene for antibiosis-based resistance to orange wheat blossom midge [Sitodiplosis modellana (Gehin)]. It combines high grain yield, grain protein concentration, yellow pigment, test weight, and low grain cadmium concentration. AAC Marchwell has similar straw strength, plant height, and days to maturity as Strongfield. AAC Marchwell is resistant to leaf rust, stem rust, stripe rust, common bunt, loose smut, and common root rot. AAC Marchwell has end use quality suitable for the Canada Western Amber Durum class.
DePauw, R. M., Knox, R. E., Singh, A. K., McCaig, T. N., Clarke, J. M. and Cuthbert, R. D. 2013. NRG010 General Purpose spring wheat. Can. J. Plant Sci. 93: 549–555. Based on 26 trials over 2 yr, the cultivar NRG010 yielded similar to the General Purpose checks Hoffman and AC Andrew. NRG010 had significantly shorter stature than Hoffman. NRG010 had a large white kernel intermediate in size to AC Andrew and Hoffman. NRG010 expressed resistance to prevalent races of leaf rust, stem rust and common bunt, and moderate susceptibility to prevalent races of loose smut and fusarium head blight. NRG010 is eligible for the Canada General Purpose wheat class.
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