Adult-plant resistance to powdery mildew in Knox 62 wheat

J. W. Johnson, Yong Fu Ge, J. J. Roberts, P. Raymer, Yong Weon Seo

Research output: Contribution to journalArticle

Abstract

Quantitative adult-plant resistance is an alternative for short-lived single major-gene resistance in the control of wheat powdery mildew caused by Blumeria graminis (DC) E.O. Speer. Cultivar 'Knox 62' is known to have adult-plant resistance to powdery mildew, but the relationship between the genes conferring its resistance and corresponding chromosomes has not been documented. To determine the chromosomal locations of adult-plant resistance genes, Knox 62 was crossed with the susceptible disomic Chinese Spring and a full set of Chinese Spring monosomic lines. The adult plants of F 2 populations and their parents were evaluated for resistance to powdery mildew in a condition of polycyclic infection, based on their infection type (IT), infected leaf area (ILA), area under disease development curve (AUDPC) and daily disease increase index (DDII) controlled in the glasshouse. Results indicated that the resistance genes in Knox 62 are mainly additive, and 7 chromosomes were involved in the adult-plant resistance of this cultivar. Chromosomes 5A, 7A, 4B and 5D carry genes showing positive effects on resistance, while chromosomes 3A, 1B and 1D have factors increasing susceptibility. The segregation of the disomic F 2 populations and noncritical crosses fit a four-gene model, suggesting that chromosomes 5A, 7A, 4B and 5D each contain one gene or one cluster of tightly-linked genes.

Original languageEnglish
Pages (from-to)281-288
Number of pages8
JournalCereal Research Communications
Volume31
Issue number3-4
Publication statusPublished - 2003 Nov 14
Externally publishedYes

Fingerprint

mature plants
powdery mildew
Triticum
wheat
chromosomes
Genes
Chromosomes
genes
disomics
Blumeria graminis
monosomics
Plant Genes
Chromosomes, Human, Pair 7
cultivars
major genes
Infection
infection
Population
leaf area
greenhouses

Keywords

  • Monosomic
  • Powdery mildew
  • Resistance
  • Wheat

ASJC Scopus subject areas

  • Agronomy and Crop Science

Cite this

Johnson, J. W., Ge, Y. F., Roberts, J. J., Raymer, P., & Seo, Y. W. (2003). Adult-plant resistance to powdery mildew in Knox 62 wheat. Cereal Research Communications, 31(3-4), 281-288.

Adult-plant resistance to powdery mildew in Knox 62 wheat. / Johnson, J. W.; Ge, Yong Fu; Roberts, J. J.; Raymer, P.; Seo, Yong Weon.

In: Cereal Research Communications, Vol. 31, No. 3-4, 14.11.2003, p. 281-288.

Research output: Contribution to journalArticle

Johnson, JW, Ge, YF, Roberts, JJ, Raymer, P & Seo, YW 2003, 'Adult-plant resistance to powdery mildew in Knox 62 wheat', Cereal Research Communications, vol. 31, no. 3-4, pp. 281-288.
Johnson JW, Ge YF, Roberts JJ, Raymer P, Seo YW. Adult-plant resistance to powdery mildew in Knox 62 wheat. Cereal Research Communications. 2003 Nov 14;31(3-4):281-288.
Johnson, J. W. ; Ge, Yong Fu ; Roberts, J. J. ; Raymer, P. ; Seo, Yong Weon. / Adult-plant resistance to powdery mildew in Knox 62 wheat. In: Cereal Research Communications. 2003 ; Vol. 31, No. 3-4. pp. 281-288.
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