caa a22 4500 445323272 CHVBK 20180317142711.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s10681-010-0235-7 doi (NATIONALLICENCE)springer-10.1007/s10681-010-0235-7 Allelic changes in bread wheat cultivars were associated with long-term wheat trait improvements [Elektronische Daten] [Yong-Bi Fu, Daryl Somers] Genetic impacts under selective breeding of agricultural crops have been frequently investigated with molecular tools, but inadequate attention has been paid to assess genetic changes under long-term genetic improvement of plant traits. Here we analyzed allelic changes with respect to wheat trait improvement in 78 Canadian hard red spring wheat cultivars released from 1845 to 2004 and screened with 370 mapped SSR markers. The improvements in quality, maturity, yield, disease, stem rust, leaf rust, sawfly resistance, and agronomy were considered. A total of 154 (out of 370) loci with significant allelic changes across 21 chromosomes were detected in the 78 wheat cultivars separated into improved versus non-improved groups for eight traits. The number of significant loci for improving a trait ranged from four for quality to 68 for yield and averaged 35. Many more loci with significant allelic reduction for improving a trait were detected than those with significant allelic increase. Selection for early maturity introduced more alleles, but improving the other traits purged more alleles. Significantly lower numbers of unique alleles were found in the cultivars with improved traits. The distributions of unique allele counts also varied greatly across the 21 chromosomes with respect to trait improvement. Significant SSR variation between two cultivar groups was observed for improvement in seven traits, but not in stem rust. The proportional SSR variation residing between two groups ranged from 0.014 to 0.118. The proportional SSR variations within the improved cultivar groups consistently were much lower than those within the non-improved groups. These findings clearly demonstrate the association between allelic changes and wheat trait improvements and are useful for understanding the genetic modification of the wheat genome by long-term wheat breeding. Her Majesty the Queen in Right of Canada, 2010 Plant breeding nationallicence Breeding target trait nationallicence SSR marker nationallicence Genetic diversity nationallicence Triticum aestivum nationallicence Fu Yong-Bi Plant Gene Resources of Canada, Saskatoon Research Centre, Agriculture and Agri-Food Canada, 107 Science Place, S7N 0X2, Saskatoon, SK, Canada aut Somers Daryl Vineland Research and Innovation Centre, 4890 Victoria Avenue North, P.O. Box 4000, L0R 2E0, Vineland Station, ON, Canada aut Euphytica Springer Netherlands 179/2(2011-05-01), 209-225 0014-2336 179:2<209 2011 179 10681 https://doi.org/10.1007/s10681-010-0235-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10681-010-0235-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fu Yong-Bi Plant Gene Resources of Canada, Saskatoon Research Centre, Agriculture and Agri-Food Canada, 107 Science Place, S7N 0X2, Saskatoon, SK, Canada aut NATIONALLICENCE 700 1- Somers Daryl Vineland Research and Innovation Centre, 4890 Victoria Avenue North, P.O. Box 4000, L0R 2E0, Vineland Station, ON, Canada aut NATIONALLICENCE 773 0- Euphytica Springer Netherlands 179/2(2011-05-01), 209-225 0014-2336 179:2<209 2011 179 10681 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer