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Confirmation of Nonsuppressor Mutation of Stem Rust Resistance in ‘Canthatch’ Common Wheat
Author(s) -
Kerber E. R.,
Aung T.
Publication year - 1995
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/cropsci1995.0011183x003500030017x
Subject(s) - stem rust , biology , mutant , common wheat , genetics , puccinia , chromosome , mutation , allele , gene , cultivar , microbiology and biotechnology , botany , mildew
A mutation induced in the common wheat cultivar Canthatch ( Triticum aestivum L.) results in resistance to several races of stem rust ( Puccinia graminis Pers.:Pers. f. sp. tritici Eriks. & E. Henn.) to which Canthatch is susceptible. Previous evidence indicated the mutation behaved as a nonsuppressing allele on chromosome arm 7DL, which permitted the expression of resistance normally inhibited by a suppressor also located on 7DL. However, to eliminate the possibility that the improved resistance resulted from a mutation to a resistance gene, additional experiments were undertaken. Chromosome 7D of the susceptible caltivar Chinese Spring was substituted by the corresponding chromosome of the resistant mutant, Canthatch‐NS, and of Canthatch. Also, pentaploids were produced from crosses of susceptible tetraploids ‘Pelissier’ durum wheat and Tetraprelude with the resistant Canthatch mutant. The 7D substitutions of Canthatch‐NS and Canthatch, as well as the pentaploids, were fully susceptible. Consequently, the mutation induced in Canthatch‐NS was not of a resistance gene, thus confirming the previous conclusion that it behaves as a nonsuppressing allele.