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Alien Chromosome Substitution—A Cause of Instability for Leaf Rust Resistance in Oats 1
Author(s) -
Sharma D. C.,
Forsberg R. A.
Publication year - 1974
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/cropsci1974.0011183x001400040012x
Subject(s) - biology , avena , alien , ploidy , botany , chromosome , repens , genetics , gene , population , census , demography , sociology
Monosomic alien chromosome substitution was discovered in F 11 to F 13 lines of the oat ( Avena sp.) cross, derived‐tetraploid C.I. 7232 (2n=28) ✕ Avena sativa L. cv. ‘Clarion’ (2n=42). Transmission of 21‐chromosome alien substitution gametophytes through the male and female at differential frequencies of 0.0 and 39.0%, respectively, was responsible for lack of homogeneity for resistance to leaf rust ( Puccinia coronata Cda. f. sp. avenae Fraser & Led.). Cytological examination of alien addition (21″ + 1′A), monosomic alien substitution (20″+1′+1′A), and monosomic susceptible plants revealed that the alien chromosome, which carries the gene(s) for resistance from the diploid progenitor, is submetacentric and the replaced A. sativa chromosome is metacentric.