Genetic and molecular characterization of resistance to Heterodera glycines race isolates 1, 3, and 5 in Peking |
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| Authors: | BX Qiu DA Sleper AP Rao Arelli |
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| Institution: | (1) Department of Agronomy, University of Missouri-Columbia, Columbia, MO, 65211, U.S.A |
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| Abstract: | Soybean cyst nematode (SCN), Heterodera glycines Ichinohe, has caused severe damage to soybean Glycine max (L.) Merr.] worldwide
since its discovery in 1954. ‘Peking’ is one of the most important sources in breeding SCN resistant soybean cultivars because
it is resistant to Races 1, 3, and 5. Genetic information on SCN Races 1, 3, and 5 from Peking is essential to efficiently
develop resistant soybean cultivars. Resistance to Race 3 in Peking was found to be controlled by three genes, but little
is known on the inheritance of resistance to Races 1 and 5, and whether alleles conditioning resistance to Races 1 and 5 belong
to the same linkage group and are allelic to genes giving resistance to Race 3. To determine the genetic bases of resistance
to SCN Races 1, 3, and 5, Peking was crossed to the susceptible line ‘Essex’ to generate F1 hybrids. The F2 population and F 2:3 families were advanced from the F1 and evaluated for resistance to SCN Race isolates 1, 3, and 5. Resistance to H. glycines Race isolates 1, 3, and 5 in Peking
was found to be conditioned by three genes, one dominant and two recessive (Rhg, rhg, rhg). Peking may share similar sets
of resistance loci between Races 1 and 3, but not between Races 3 and 5, or between Races 1 and 5.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | Glycine max Heterodera glycines inheritance molecular markers RFLPs soybean cyst nematode |
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