Multigeneic QTL: The laccase encoded within the soybean Rfs2/rhg1 locus inferred to underlie part of the dual resistance to cyst nematode and sudden death syndrome

M. J. Iqbal, R. Ahsan, Ahmed Afzal, A. Jamai, K. Meksem, H. A. El-Shemy, D. A. Lightfoot

Research output: Contribution to journalArticle

Abstract

Multigeneic QTL present significant problems to analysis. Resistance to soybean (Glycine max (L) Merr.) sudden death syndrome (SDS) caused by Fusarium virguliforme was partly underlain by QRfs2 that was clustered with, or pleiotropic to, the multigeneic rhg1 locus providing resistance to soybean cyst nematode (SCN; Heterodera glycines). A group of five genes were found between the two markers that delimited the Rfs2/rhg1 locus. One of the five genes was predicted to encode an unusual diphenol oxidase (laccase; EC 1.10.3.2). The aim of this study was to characterize this member of the soybean laccase gene-family and explore its involvement in SDS resistance. A genomic clone and a full length cDNA was isolated from resistant cultivar 'Forrest' that were different among susceptible cultivars 'Asgrow 3244' and 'Williams 82' at four residues R/H168, I/M271, R/H330, E/K470. Additional differences were found in six of the seven introns and the promoter region. Transcript abundance (TA) among genotypes that varied for resistance to SDS or SCN did not differ significantly. Therefore the protein activity was inferred to underlie resistance. Protein expressed in yeast pYES2/NTB had weak enzyme activity with common substrates but good activity with root phenolics. The Forrest isoform may underlie both QRfs2 and rhg1.

Original languageEnglish (US)
JournalCurrent Issues in Molecular Biology
Volume11
Issue numberSUPPL. 1
StatePublished - Dec 1 2009

Fingerprint

Laccase
Sudden Death
Soybeans
Cysts
Genes
Catechol Oxidase
Fusarium
Social Justice
Genetic Promoter Regions
Glycine
Introns
Protein Isoforms
Proteins
Complementary DNA
Clone Cells
Yeasts
Genotype
Enzymes

Keywords

  • Laccase
  • SDS resistance
  • Soybean
  • Yeast expression

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology
  • Microbiology (medical)

Cite this

Multigeneic QTL : The laccase encoded within the soybean Rfs2/rhg1 locus inferred to underlie part of the dual resistance to cyst nematode and sudden death syndrome. / Iqbal, M. J.; Ahsan, R.; Afzal, Ahmed; Jamai, A.; Meksem, K.; El-Shemy, H. A.; Lightfoot, D. A.

In: Current Issues in Molecular Biology, Vol. 11, No. SUPPL. 1, 01.12.2009.

Research output: Contribution to journalArticle

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