Inheritance of Russian wheat aphid resistance from tetraploid wheat accessions during transfer to hexaploid wheat |
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Authors: | Benjamin M Beyer Scott D Haley Nora L V Lapitan Junhua H Peng Frank B Peairs |
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Institution: | (1) Soil and Crop Sciences Department, Colorado State University, Fort Collins, CO 80523, USA;(2) Wuhan Botanical Garden/Institute, Chinese Academy of Sciences, Moshan, Wuhan, 430074, Hubei, China;(3) Bioagricultural Sciences and Pest Management Department, Colorado State University, Fort Collins, CO 80523, USA; |
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Abstract: | Identification of new sources of resistance to Russian wheat aphid (RWA) (Diuraphis noxia (Kurdjumov) in wheat (Triticum aestivum L.) has become very important with the identification of several new biotypes since 2003. Our objective was to characterize
inheritance and expression of resistance to RWA biotype 2 from three tetraploid wheat landraces (Triticum turgidum L. subsp. dicoccon) during transfer to hexaploid wheat. Resistant tetraploid accessions PI 624903, PI 624904, and PI 624908 were crossed to
the susceptible hexaploid cultivars ‘Len’ and ‘Coteau’. Resistant F1 progeny were advanced to the F2:3 by self-pollination
and to the BC1F2 and BC2F1 by backcrossing. Leaf rolling and chlorosis were recorded in standard seedling screening tests
on F1 and F2:3 individuals while the F2, BC1F1, BC1F2, and BC2F1 were scored as resistant or susceptible. Segregation in the
BC1F1 and BC2F1 fit a 1:1 resistant:susceptible ratio, indicative of control by a single dominant gene. Segregation for resistance
in the F2 did not fit 3:1, 13:3, or 15:1 ratios for any of the resistant accessions. Expression of resistance in homogeneous
resistant F2:3 lines was greater than susceptible checks, similar to the resistant tetraploid accessions, and less than a
line carrying the Dn7 resistance gene. Resistance derived from these tetraploid accessions will be useful to broaden the base of RWA resistance
available for use in wheat breeding. |
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