Radiation-induced nonhomoeologous wheat-Agropyron intermedium chromosomal translocations conferring resistance to leaf rust |
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Authors: | B. Friebe J. Jiang B. S. Gill P. L. Dyck |
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Affiliation: | (1) Department of Plant Pathology, Throckmorton Hall, Kansas State University, 66506-5501 Manhattan, KS, USA;(2) Agriculture Canada, R3T 2M9 Winnipeg, Manitoba, Canada |
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Abstract: | Summary The Agropyron intermedium chromosome 7Ai #2 is the source of the leaf rust resistance gene Lr38 which was transferred to wheat by irradiation. The chromosomal constitutions of eight radiation-induced rust-resistant wheat-Agropyron intermedium derivatives were analyzed by C-banding and genomic in-situ hybridization (GISH). Five lines were identified as wheat Ag. intermedium chromosome translocation lines with the translocation chromosomes T2AS·2AL-7Ai#2L, T5AL · 5AS-7Ai # 2L, T1DS · 1DL-7Ai # 2L, T3DL · 3DS-7Ai#2L, and T6DS · 6DL-7Ai#2L. The sizes of the 7Ai#2L segments in mitotic metaphases of these translocations are 2.42 m, 4.20 m, 2.55 m, 2.78 m, and 4.19 m, respectively. One line was identified as a wheat-Ag. intermedium chromosome addition line. The added Ag. intermedium chromosome in this line is different from 7Ai # 2. This line has resistance to leaf rust and stem rust. Based on the rust reactions, and the C-banding and GISH results, the remaining two lines do not contain any Ag. intermedium-derived chromatin. |
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Keywords: | Common wheat Allen translocations Agropyron intermedium Leaf rust resistance In-situ hybridization C-banding |
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