The Cladosporium fulvum resistance gene Cf-ECP3 is part of the Orion cluster on the short arm of tomato Chromosome 1 |
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Authors: | Yinan Yuan Jair Haanstra Pim Lindhout Guusje Bonnema |
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Affiliation: | (1) Laboratory of Plant Breeding, Graduate School for Experimental Plant Sciences, Wageningen University, 6700 AJ Wageningen, The Netherlands;(2) Present address: Department of Biological Sciences, Purdue University, Hansen 339, West Lafayette, IN 47907, USA;(3) Present address: Rijk Zwaan Zaadteelt en Zaadhandel B.V., P.O.Box 40, 2678 De Lier, The Netherlands |
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Abstract: | The resistance of tomato to the pathogenic fungus Cladosporiumfulvum complies with the gene-for-gene relationship. Race specificresistance is based on Cf-gene mediated recognition ofsecreted avirulence products, resulting in a hypersensitive response (HR).Besides the avirulence gene products, C. fulvum secretes anumber of extra cellular proteins (ECPs) into the apoplast. Two L.esculentum accessions have previously been identified that reactedwith a HR upon injection with purified ECP3. The corresponding resistance genedesignated Cf-ECP3 was mapped by using an F2population composed of 192 plants from the cross of susceptible MoneyMaker toresistant L. esculentum G1.1153.Cf-ECP3 inherited monogenically, cosegragated with theChromosome 1 Cleaved Amplified Polymorphic Sequence (CAPS) marker CT116 and wasmapped accurately at Orion, a locus harbouring Cf-ECP2 inother genotypes. RFLP anaysis with a Cf-9 probe furtherdemonstrated cosegregation of Cf-ECP3 with anHcr9 (Homologue of Cladosporiumfulvumresistance gene Cf-9) indicating that this gene is likelyan Hcr9. Thus in addition to the Milky Way locusharbouringthe Cf-4, Cf-4A andCf-9 resistance genes targeted against AVR4, AVR4A andAVR9, Orion is another complex locus on the short arm of Chromosome 1 thatharbours at least two functional Cf-genes,Cf-ECP2 and Cf-ECP3, targeted againstthe fungal excreted proteins ECP2 and ECP3. |
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Keywords: | Cf-ECP3 Cladosporium fulvum Complex locus Lycopersicon esculentum Orion |
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