TY - JOUR
T1 - Resistance to Phakopsora pachyrhizi in Soybean PI 587905 Maps to the Rpp1 Locus and Exhibits Variable Dominance Associated with Plant Ontogeny
AU - Smith, James R.
AU - Ray, Jeffery D.
AU - Morel, Wilfrido
AU - Frederick, Reid D.
AU - Walker, David R.
N1 - Publisher Copyright:
© Taylor & Francis Group, LLC.
PY - 2015/9/3
Y1 - 2015/9/3
N2 - Soybean rust, caused by Phakopsora pachyrhizi Sydow, results in significant soybean (Glycine max (L.) Merr.) yield losses worldwide. The purpose of this research was to confirm the inheritance, gene action, and genomic location of resistance to P. pachyrhizi in soybean accession PI 587905. Two independent populations (F2-derived F3 lines and F2 plants) were inoculated with P. pachyrhizi in a greenhouse and assayed in a field, respectively, in southeastern Paraguay. Both the field F2 and the greenhouse F2-inferred segregation ratios fit the 1:2:1 ratio expected for segregation of a single gene (P > 0.05). Unlike previous studies, gene action differed according to ontogeny. Among seedlings in the greenhouse, gene action was dominant, but in the field assay among adult plants, the gene exhibited incomplete dominance. Molecular markers were used to map the resistance gene in PI 587905 to the Rpp1 locus. This information should be useful to plant breeders for developing and selecting resistant cultivars.
AB - Soybean rust, caused by Phakopsora pachyrhizi Sydow, results in significant soybean (Glycine max (L.) Merr.) yield losses worldwide. The purpose of this research was to confirm the inheritance, gene action, and genomic location of resistance to P. pachyrhizi in soybean accession PI 587905. Two independent populations (F2-derived F3 lines and F2 plants) were inoculated with P. pachyrhizi in a greenhouse and assayed in a field, respectively, in southeastern Paraguay. Both the field F2 and the greenhouse F2-inferred segregation ratios fit the 1:2:1 ratio expected for segregation of a single gene (P > 0.05). Unlike previous studies, gene action differed according to ontogeny. Among seedlings in the greenhouse, gene action was dominant, but in the field assay among adult plants, the gene exhibited incomplete dominance. Molecular markers were used to map the resistance gene in PI 587905 to the Rpp1 locus. This information should be useful to plant breeders for developing and selecting resistant cultivars.
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U2 - 10.1080/15427528.2015.1064844
DO - 10.1080/15427528.2015.1064844
M3 - Article
AN - SCOPUS:84941657875
SN - 1542-7528
VL - 29
SP - 581
EP - 601
JO - Journal of Crop Improvement
JF - Journal of Crop Improvement
IS - 5
ER -