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Validation and Interaction of the Soybean Mosaic Virus Lethal Necrosis Allele, Rsv1‐n , in PI 507389
Author(s) -
Tucker D. M.,
Maroof M. A. Saghai,
Jeong S. C.,
Buss G. R.,
Tolin S. A.
Publication year - 2009
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/cropsci2008.08.0477
Subject(s) - biology , soybean mosaic virus , allele , genotype , gene , genetics , potyvirus , potyviridae , virology , glycine , plant disease resistance , plant virus , virus , amino acid
Soybean mosaic virus (SMV) is the causal agent of a commonly occurring disease of soybean [ Glycine max (L.) Merr.] that can be effectively controlled through the deployment of single, dominant genes known as Rsv genes, which confer resistance to different strains of SMV. The Rsv1‐n allele in PI 507389 conditions a lethal necrosis (LN) reaction on inoculation with specific SMV strains, including SMV‐G1, ‐G5, and ‐G6. The objective of the current study was to examine effects of the Rsv1‐n allele introgressed into the susceptible genotype ‘Essex’ background alone or in combination with either Rsv3 or Rsv4 resistance genes by inoculation with six different SMV strains. Presence of Rsv1‐n and its LN as well as severe mosaic reactions to the strains tested were masked when the gene was pyramided with Rsv3 and Rsv4 Thus in some cases, the LN‐causing gene may go undetected in breeding populations. Pyramided isolines containing Rsv1‐n and Rsv4 together were susceptible to SMV‐G6, displaying a mosaic reaction, although Rsv4 alone confers resistance against all known strains. This study demonstrates the importance of selecting against the Rsv1‐n allele to prevent its introduction into breeding programs.