Pathogenesis-related proteins and their genes in cereals

  • S. Muthukrishnan
  • George H. Liang
  • Harold N. Trick
  • Bikram S. Gill


Pathogenesis-related proteins (PR-proteins) are induced in plants in response to attack by microbial or insect pests. They have been classified into several groups (PR-1 through PR-14 at present) based on their amino acid sequences and biochemical functions. Many of these proteins that have been purified from infected plants or seed extracts possess antifungal or insecticidal activity. Genes and cDNA clones for all classes of PR-proteins have been isolated from a variety of cereals. Some of these genes/cDNAs have been used to transform cereals. This review presents a summary of the PR-proteins and their genes characterized from rice, wheat, barley, sorghum and maize. Efforts to improve disease or insect resistance of these cereal plants by genetic engineering using genes for PR-proteins also are discussed. In many cases, the expression of the PR-proteins either singly or in combination appears to improve resistance to fungi or insects. In addition, chromosomal location of the PR-protein genes indicates that members of the same family of PR-protein genes or sometimes even several families of PR-protein genes often are clustered in the cereal genome, suggesting coordinate regulation. Some of these PR-protein genes map closely to quantitative traits loci. Some concerns regarding the use of genes encoding PR-proteins for genetic modification of cereals also are addressed.

barley cDNAs cereals chromosomal location concerns disease resistance genes genetic engineering insect resistance maize pathogenesis-related proteins rice sorghum wheat 


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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • S. Muthukrishnan
    • 1
  • George H. Liang
    • 2
  • Harold N. Trick
    • 3
  • Bikram S. Gill
    • 3
  1. 1.Departments of BiochemistryKansas State UniversityManhattanUSA
  2. 2.AgronomyKansas State UniversityManhattanUSA
  3. 3.Plant PathologyKansas State UniversityManhattanUSA

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