Rmg10, a Novel Wheat Blast Resistance Gene Derived from Aegilops tauschii

被引：1
作者：
Yoshioka, Motohiro [1 ]
Kishii, Masahiro [2 ]
Singh, Pawan Kumar [2 ]
Inoue, Yoshihiro [3 ]
Vy, Trinh Thi Phuong [1 ]
Tosa, Yukio [1 ]
Asuke, Soichiro [1 ]
机构：
[1] Kobe Univ, Grad Sch Agr Sci, Kobe 6578501, Japan
[2] Int Maize & Wheat Improvement Ctr CIMMYT, Mexico City, Mexico
[3] Kyoto Univ, Grad Sch Agr, Kyoto 6068502, Japan
来源：
PHYTOPATHOLOGY | 2024年 / 114卷 / 09期
关键词：
Aegilops tauschii; Magnaporthe oryzae; Pyricularia oryzae; resistance gene; wheat blast; STEM RUST RESISTANCE; PYRICULARIA-ORYZAE; MAGNAPORTHE-ORYZAE; STRIPE RUST; WILD WHEAT; TRITICUM; PATHOTYPE; SUPPRESSION; BANGLADESH; EVOLUTION;
D O I：
10.1094/PHYTO-01-24-0018-R
中图分类号：
Q94 [植物学];
学科分类号：
071001 ;
摘要：
Wheat blast, caused by Pyricularia oryzae (syn. Magnaporthe oryzae) pathotype Triticum (MoT), is a devastating disease that can result in up to 100% yield loss in affected fields. To find new resistance genes against wheat blast, we screened 199 accessions of Aegilops tauschii, the D genome progenitor of common wheat (Triticum aestivum), by seedling inoculation assays with Brazilian MoT isolate Br48 and found 14 resistant accessions. A synthetic hexaploid wheat line (Ldn/KU-2097) derived from a cross between the T. turgidum 'Langdon' (Ldn) and resistant A. tauschii accession KU-2097 exhibited resistance in seedlings and spikes against Br48. In an F2 population derived from 'Chinese Spring' x Ldn/KU-2097, resistant and susceptible individuals segregated in a 3:1 ratio, suggesting that the resistance from KU-2097 is controlled by a single dominant gene. We designated this gene Rmg10. Genetic mapping using an F2:3 population from the same cross mapped the RMG10 locus to the short arm of chromosome 2D. Rmg10 was ineffective against Bangladesh isolates but effective against Brazilian isolates. Field tests in Bolivia showed increased spike resistance in a synthetic octaploid wheat line produced from a cross between common wheat cultivar 'Gladius' and KU-2097. These results suggest that Rmg10 would be beneficial in farmers' fields in South America.
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页码：2113 / 2120
页数：8
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