Data/hora: 06/06/2024 02:50:05

Provedor de dados: | Obihiro University of Agriculture and Veterinary Medicine Academic Repository (OAK)
País: | Japan
Título: | Increased grain dormancy in white-grained wheat by introgression of preharvest sprouting tolerance QTLs
Autores: | Kottearachchi, NS; Uchino, N.; Kato, Kiyoaki; Miura, Hideho; 加藤, 清明; 三浦, 秀穂.
Data: | 2006-12
Ano: | 2006
Palavras-chave: | Grain dormancy; Molecular marker; QTL; Triticum aestivum; White-grained wheat.
Resumo: | White-grained wheat cultivars have long been recognized to be less resistant to preharvest sprouting (PHS) than the red-grained ones. Previously two QTLs for grain dormancy, QPhs.ocs-3A.1 (QPhs-3AS) and QPhs.ocs-4A.1 (QPhs-4AL) were identified in a highly dormant Japanese red wheat, Zenkoujikomugi (Zen). Aiming at improvement of PHS tolerance in white-grained wheat, the introgression effect of these two QTLs in a white-grained population consisting of 40 recombinant inbred lines (RILs) developed from a cross between Zen and white-grained Spica was examined here. Random 20 RILs with red grains were also developed from the same cross and used as a control population. The RILs were grown in the field and in the glasshouse to evaluate the grain dormancy by germination test. Several SSR markers closely linked to the QPhs-3AS and QPhs-4AL were used to estimate the alleles at the QTLs. Dormancy variation in the RILs was significantly associated with the differences for grain color and the alleles at QPhs-3AS over several years. Although allelic variation was detected in a SSR marker closely linked to QPhs-4AL there was no difference in germination data between the Zen-allele and the Spica-allele groups. As expected, the red-grained RILs with the Zen allele at QPhs-3AS were the most dormant. Some white-grained RILs with the Zen allele at QPhs-3AS showed higher dormancy compared to the red-grained RILs with the alternative allele. These results demonstrated that introgression of the QPhs-3AS gene could contribute to the increased grain dormancy in white-grained wheat.
Idioma: | Inglês
Identificador: | http://ir.obihiro.ac.jp/dspace/handle/10322/714
Editor: | SPRINGER
Formato: | application/pdf