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Published in Crop Sci 14:533-536 (1974)
© 1974 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Alien Chromosome Substitution—A Cause of Instability for Leaf Rust Resistance in Oats1

D. C. Sharma and R. A. Forsberg2

Monosomic alien chromosome substitution was discovered in F11 to F13 lines of the oat (Avena sp.) cross, derived-tetraploid C.I. 7232 (2n=28) x 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.

Key Words: Avena sp. • Gene transfer • Addition line • Differential gametophytic transmission • Chromosome pairing • Monosomic alien chromosome substitution

1 Contribution from Dept, of Agronomy, Wisconsin Agr. Exp. Sta., Madison, WI 53706. Research supported by the College of Agricultural and Life Sciences and by the Wisconsin Alumni Research Foundation through the University Research Committee, University of Wisconsin, Madison. Part of the research submitted by the senior author as partial fulfillment of requirements for the Ph.D. degree.

2 Graduate Research Assistant and Professor, respectively.

Received for publication January 23, 1974.




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