Identification of a QTL decreasing yield in barley linked to Mlo powdery mildew resistance

W. T.B. Thomas (Lead / Corresponding author), E. Baird, J. D. Fuller, P. Lawrence, G. R. Young, J. Russell, L. Ramsay, R. Waugh, W. Powell

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

A molecular marker map, including Mlo mildew resistance, of the spring barley cross Derkado (Mlo-resistant) x B83-12/21/5 (Mlo-susceptible) was scanned for yield QTLs to determine whether the association of Mlo resistance with reduced yield was due to linkage or pleiotropy. Over the mapped portion of the genome of the cross, the QTL with the greatest effect upon yield was located within a 22 cM region between mlo and the simple sequence repeat HVM67 on chromosome 4(4H). The association of Mlo resistance with lower yield was therefore due to a repulsion linkage. Analysis of yield component characters revealed QTL alleles for reduced grain number and earlier heading date in the same region, also associated with Mlo resistance. Genotyping of a range of cultivars and sources of Mlo resistance with the HVM67 simple sequence repeat showed that the Derkado HVM67 allele was rare as it was found only in one other cultivar and four land-races or sources of disease resistance. Grannenlose Zweizeilige, the source, and Salome, the carrier of Mlo resistance in Derkado, have the same HVM67 genotype, although Salome was a mixture of two genotypes. The entire mlo-HVM67 chromosomal segment from Grannenlose Zweizeilige is therefore thought to have been transmitted to Derkado, possibly through joint selection for Mlo resistance and early heading. L92, synonym EP79, was another source of Mlo resistance with the same HVM67 allele as Derkado but recombination must have occurred during the breeding of Atem as it possesses a different HVM67 allele which is present in all the other Mlo sources and cultivars surveyed.

Original languageEnglish
Pages (from-to)381-393
Number of pages13
JournalMolecular Breeding
Volume4
Issue number5
DOIs
Publication statusPublished - Oct 1998

Fingerprint

Hordeum
powdery mildew
quantitative trait loci
Alleles
barley
alleles
heading
Microsatellite Repeats
linkage (genetics)
cultivars
Genotype
microsatellite repeats
pleiotropy
Chromosomes, Human, Pair 4
Disease Resistance
genotype
spring barley
yield components
Genetic Recombination
genotyping

Keywords

  • Barley
  • Introgression
  • Mlo mildew resistance
  • QTLs
  • SSRs
  • Yield

Cite this

Thomas, W. T. B., Baird, E., Fuller, J. D., Lawrence, P., Young, G. R., Russell, J., ... Powell, W. (1998). Identification of a QTL decreasing yield in barley linked to Mlo powdery mildew resistance. Molecular Breeding, 4(5), 381-393. https://doi.org/10.1023/A:1009646115967
Thomas, W. T.B. ; Baird, E. ; Fuller, J. D. ; Lawrence, P. ; Young, G. R. ; Russell, J. ; Ramsay, L. ; Waugh, R. ; Powell, W. / Identification of a QTL decreasing yield in barley linked to Mlo powdery mildew resistance. In: Molecular Breeding. 1998 ; Vol. 4, No. 5. pp. 381-393.
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Thomas, WTB, Baird, E, Fuller, JD, Lawrence, P, Young, GR, Russell, J, Ramsay, L, Waugh, R & Powell, W 1998, 'Identification of a QTL decreasing yield in barley linked to Mlo powdery mildew resistance', Molecular Breeding, vol. 4, no. 5, pp. 381-393. https://doi.org/10.1023/A:1009646115967

Identification of a QTL decreasing yield in barley linked to Mlo powdery mildew resistance. / Thomas, W. T.B. (Lead / Corresponding author); Baird, E.; Fuller, J. D.; Lawrence, P.; Young, G. R.; Russell, J.; Ramsay, L.; Waugh, R.; Powell, W.

In: Molecular Breeding, Vol. 4, No. 5, 10.1998, p. 381-393.

Research output: Contribution to journalArticle

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T1 - Identification of a QTL decreasing yield in barley linked to Mlo powdery mildew resistance

AU - Thomas, W. T.B.

AU - Baird, E.

AU - Fuller, J. D.

AU - Lawrence, P.

AU - Young, G. R.

AU - Russell, J.

AU - Ramsay, L.

AU - Waugh, R.

AU - Powell, W.

PY - 1998/10

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Thomas WTB, Baird E, Fuller JD, Lawrence P, Young GR, Russell J et al. Identification of a QTL decreasing yield in barley linked to Mlo powdery mildew resistance. Molecular Breeding. 1998 Oct;4(5):381-393. https://doi.org/10.1023/A:1009646115967