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Root responses to cereal cyst nematode (Heterodera avenae) in hosts with different resistance genes

Published online by Cambridge University Press:  01 June 2000

S. SEAH
Affiliation:
CSIRO Plant Industry, GPO Box 1600, Canberra ACT 2601, Australia Plant Sciences, Faculty of Agriculture, University of Western Australia, Nedlands WA 6907, Australia
C. MILLER
Affiliation:
CSIRO Plant Industry, GPO Box 1600, Canberra ACT 2601, Australia
K. SIVASITHAMPARAM
Affiliation:
Soil Science and Plant Nutrition, Faculty of Agriculture, University of Western Australia, Nedlands WA 6907, Australia
E. S. LAGUDAH
Affiliation:
CSIRO Plant Industry, GPO Box 1600, Canberra ACT 2601, Australia
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Abstract

The development of cereal cyst nematode (CCN; Heterodera avenae) induced syncytia in the host roots of infected resistant bread wheat (Triticum aestivum cv. AUS10894), diploid wheat (Aegilops tauschii), barley (Hordeum vulgare cv. Chebec and cv. Galleon) and in the susceptible wheat cv. Meering and barley cv. Clipper were studied over a period of 13 d. The resistance to CCN in these cereal plants is conferred by the resistance genes Cre1 in the wheat cv. AUS10894, Cre3 in A. tauschii, Ha2 in barley cv. Chebec and Ha4 in barley cv. Galleon. Anatomical observations were made on the development of the syncytia in CCN-infected wheat and barley roots, which carry each of these four sources of resistance genes. Accelerated development of the syncytia in resistant plants, especially in the barley cultivars, was observed. The sites of syncytia development in susceptible wheat and barley were also closely associated with the vascular tissues in the stele, but less so in the resistant plants. The syncytia in the infected susceptible wheat and barley were also metabolically active at day 13. By contrast, the syncytia of resistant wheat plants carrying the Cre1 or Cre3 genes remained extensively vacuolated and less metabolically active. In barley plants with the Ha2 or Ha4 genes, the syncytia appeared non-functional and in early stages of degeneration by day 13 after inoculation.

Type
Research Article
Copyright
© Trustees of the New Phytologist 2000

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