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Two Major Recessive Soybean Genes Conferring Soybean Rust Resistance
Author(s) -
Calvo Éberson S.,
Kiihl Romeu A.S.,
Garcia Alexandre,
Harada Arlindo,
Hiromoto Dario M.
Publication year - 2008
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2007.10.0589
Subject(s) - phakopsora pachyrhizi , biology , soybean rust , allele , gene , genetics , cultivar , phenotype , rust (programming language) , glycine soja , glycine , plant disease resistance , botany , amino acid , computer science , fungicide , programming language
Soybean rust (SBR) caused by Phakopsora pachyrhizi Syd. is currently the most threatening fungal disease of soybean [ Glycine max (L.) Merr.] in the Americas. Development of resistant or tolerant cultivars is a major goal in several soybean breeding programs. Four loci, all carrying dominant alleles that confer a resistant phenotype, have been described. We investigated the genetic basis of the resistance in PI 200456 and PI 224270 by crossing each of them with a susceptible cultivar (CD 208). Phenotypic segregation ratios for F 2 plants and F 2:3 lines showed that the resistance in each resistant parent was controlled by a single recessive gene. A test for allelism demonstrated that these genes are non‐allelic. This is the first report of recessive genes controlling SBR resistance in soybean and may represent a different type of resistance for breeding programs aimed at development of more durable resistance.