通过对抗蚜小麦品种正科1号×感蚜品种石4185的F2分离群体(495株)进行田间自然抗蚜调查,发现正科1号的抗蚜虫性状受显性单基因控制,鉴定出的这个显性抗蚜基因,暂定名为dnY。运用分离群体分组法(BSA)筛选到3个在抗感亲本间表现多态性...通过对抗蚜小麦品种正科1号×感蚜品种石4185的F2分离群体(495株)进行田间自然抗蚜调查,发现正科1号的抗蚜虫性状受显性单基因控制,鉴定出的这个显性抗蚜基因,暂定名为dnY。运用分离群体分组法(BSA)筛选到3个在抗感亲本间表现多态性的SSR标记(Xwms350、Xgwm437、Xgwm44);进一步将该基因定位于7DS上,距离该基因最近的标记为Xgwm44,遗传距离3.29 c M。同时讨论了基因dnY在小麦遗传改良以桨标记在抗蚜基因标记辅助选择中的作用。展开更多
The elite rice cultivar Yuejingsimiao 2 （YJ2） is characterized by a high level of grain quality and yield, and resistance against Magnaporthe oryzae. YJ2 showed 100% resistance to four fungal populations collected f...The elite rice cultivar Yuejingsimiao 2 （YJ2） is characterized by a high level of grain quality and yield, and resistance against Magnaporthe oryzae. YJ2 showed 100% resistance to four fungal populations collected from Guangdong, Sichuan, Liaoning, and Heilongjiang Provinces, which is a higher frequency than that shown by the well-known resistance （R） gene donor culti- vats such as Sanhuangzhan 2 and 28zhan. Segregation analysis for resistance with F2 and F4 populations indicated the re- sistance of YJ2 was controlled by multiple genes that are dominant or recessive. The putative R genes of YJ2 were roughly tagged by SSR markers, located on chromosomes 2, 6, 8, and 12, in a hulked-segregant analysis using genome-wide selected SSR markers with F4 lines that segregated into 3 resistant （R）： 1 susceptible （S） or 1R：3S. The recessive R gene on chromosome 8 was further mapped to an interval ~1.9 cM/152 kb in length by linkage analysis with genomic position-ready markers in the mapping population derived from an F4 line that segregated into 1R：3S. Given that no major R gene was mapped to this inter- val, the novel R gene was designated as pi55（t）. Out of 26 candidate genes predicted in the region based on the reference genomic sequence of the cultivar Nipponbare, two genes that encode a leucine-rich repeat-containing protein and heavy-metalassociated domain-containing protein, respectively, were suggested as the most likely candidates for pi55（t）.展开更多
The authors prove the local unramified correspondence for a new type of construction of CAP representations of even orthogonal groups by a generalized automorphic descent method. This method is expected to work for al...The authors prove the local unramified correspondence for a new type of construction of CAP representations of even orthogonal groups by a generalized automorphic descent method. This method is expected to work for all classical groups.展开更多
文摘通过对抗蚜小麦品种正科1号×感蚜品种石4185的F2分离群体(495株)进行田间自然抗蚜调查,发现正科1号的抗蚜虫性状受显性单基因控制,鉴定出的这个显性抗蚜基因,暂定名为dnY。运用分离群体分组法(BSA)筛选到3个在抗感亲本间表现多态性的SSR标记(Xwms350、Xgwm437、Xgwm44);进一步将该基因定位于7DS上,距离该基因最近的标记为Xgwm44,遗传距离3.29 c M。同时讨论了基因dnY在小麦遗传改良以桨标记在抗蚜基因标记辅助选择中的作用。
基金supported by the National Natural Science Foundation of China (Grant No. U1131003)the National Transgenic Research Projects(Grant Nos. 2009ZX08009-023 and 2011ZX08001-002)+1 种基金the Guangdong Provincial Natural Science Foundation (Grant No. 10151064001000008)the President Science Foundation of Guangdong Academy of Agricultural Sciences (Grant No. 201101)
文摘The elite rice cultivar Yuejingsimiao 2 （YJ2） is characterized by a high level of grain quality and yield, and resistance against Magnaporthe oryzae. YJ2 showed 100% resistance to four fungal populations collected from Guangdong, Sichuan, Liaoning, and Heilongjiang Provinces, which is a higher frequency than that shown by the well-known resistance （R） gene donor culti- vats such as Sanhuangzhan 2 and 28zhan. Segregation analysis for resistance with F2 and F4 populations indicated the re- sistance of YJ2 was controlled by multiple genes that are dominant or recessive. The putative R genes of YJ2 were roughly tagged by SSR markers, located on chromosomes 2, 6, 8, and 12, in a hulked-segregant analysis using genome-wide selected SSR markers with F4 lines that segregated into 3 resistant （R）： 1 susceptible （S） or 1R：3S. The recessive R gene on chromosome 8 was further mapped to an interval ~1.9 cM/152 kb in length by linkage analysis with genomic position-ready markers in the mapping population derived from an F4 line that segregated into 1R：3S. Given that no major R gene was mapped to this inter- val, the novel R gene was designated as pi55（t）. Out of 26 candidate genes predicted in the region based on the reference genomic sequence of the cultivar Nipponbare, two genes that encode a leucine-rich repeat-containing protein and heavy-metalassociated domain-containing protein, respectively, were suggested as the most likely candidates for pi55（t）.
基金supported by the National Science Foundation Grant(Nos.DMS–1001672,DMS–1301567)the USA-Israel Binational Science Foundation Grant(Nos.2008058,2012019)
文摘The authors prove the local unramified correspondence for a new type of construction of CAP representations of even orthogonal groups by a generalized automorphic descent method. This method is expected to work for all classical groups.
