Genetic mapping of QTLs associated with greenbug resistance and tolerance in Sorghum bicolor

H. A. Agrama*, G. E. Widle, J. C. Reese, L. R. Campbell, M. R. Tuinstra

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


Ninety three recombinant inbreds of Sorghum bicolor (L. Moench) were derived from a cross between two sorghum lines GBIK and Redlan. This population was used to identify quantitative trait loci (QTLs) for resistance and tolerance to greenbug (Schizaphids graminum Rondani) Biotypes I and K. One hundred and thirteen loci (38 SSRs and 75 RAPDs) were mapped in 12 linkage groups covering 1,530 cM. In general, nine QTLs were detected affecting both resistance and tolerance to greenbug (GB) Biotypes I and K. The phenotypic variance explained by each QTL ranged from 5.6% to 38.4%. Four SSRs and one RAPD marker were associated with the expression of all resistance and tolerance traits. These markers appear to be linked to biotype nonspecific resistance and tolerance genes. Four additional markers were associated with biotype-specific resistance or tolerance traits. The detection of more than one locus for each biotype supports the hypothesis that several regions, which represent different genes, control the expression of resistance and tolerance to greenbug in sorghum. The results can be used for marker-assisted selection and the breeding of greenbug-tolerant sorghum cultivars.

Original languageEnglish
Pages (from-to)1373-1378
Number of pages6
JournalTheoretical And Applied Genetics
Issue number8
Publication statusPublished - 2002


  • (SSRs)
  • RAPDs
  • SPAD
  • Schizaphids graminum
  • Simple sequence repeats
  • Sorghum bicolor

ASJC Scopus subject areas

  • Biotechnology
  • Agronomy and Crop Science
  • Genetics


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