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A Compensating Wheat– Thinopyrum intermedium Robertsonian Translocation Conferring Resistance to Wheat Streak Mosaic Virus and Triticum Mosaic Virus
Author(s) -
Liu W.,
Seifers D. L.,
Qi L. L.,
Friebe B.,
Gill B. S.
Publication year - 2011
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2011.03.0118
Subject(s) - biology , chromosomal translocation , genetics , chromosome , gene , virology
Wheat streak mosaic virus (WSMV), is a potentially devastating disease of common wheat ( Triticum aestivum L.) in the Great Plains of North America. So far, two genes conferring resistance to WSMV have been named and used in cultivar improvement. Here we report a new source of resistance that was derived from a wheat– Thinopyrum intermedium (Host) Barkworth & D.R. Dewey ditelosomic addition line containing, in addition to the wheat chromosome complement, a pair of long arm telochromosomes from Th. intermedium previously believed to be of group‐4 origin. New molecular marker and genomic in situ hybridization analysis revealed that this telochromosome is homeologous to the group‐7 long arms and belongs to the S genome of Th. intermedium. Accordingly, this chromosome was designated as 7S#3L. One compensating Robertsonian translocation was obtained where the 7S#3L arm was translocated to the short arm of wheat chromosome 7B, resulting in the T7BS·7S#3L translocation chromosome. Homozygous T7BS·7S#3L lines were evaluated for their resistance to WSMV and Triticum mosaic virus (TriMV). The T7BS·7S#3L stock confers resistance to WSMV at 18 and 24°C. The T7BS·7S#3L stock also confers resistance to TriMV at 18°C but is not effective above 24°C. Based on chromosome position and effective resistance to WSMV at 24°C where both Wsm1 and Wsm2 are ineffective, the new gene in T7BS·7S#3L is designated as Wsm3 .