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AOBPreview published online on March 24, 2004
Annals of Botany, doi:10.1093/aob/mch082
© 2004 by Annals of Botany Company
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Submitted on July 11, 2003
Revised on October 17, 2003
Accepted on January 23, 2004

Interaction Between Vitis vinifera and Grape Phylloxera: Changes in Root Tissue During Nodosity Formation

ALISON V. KELLOW1*, MARGARET SEDGLEY2, and ROBYN VAN HEESWIJCK1

Affiliation of the authors: 1 The University of Adelaide, Department of Horticulture, Viticulture and Oenology, PMB 1 Glen Osmond 5064, Australia and; The Cooperative Research Centre for Viticulture, PO Box 154 Glen Osmond 5064, Australia; 2 The University of Adelaide, Department of Horticulture, Viticulture and Oenology, PMB 1 Glen Osmond 5064, Australia and

* To whom correspondence should be addressed. E-mail: alisonk{at}tepapa.govt.nz.

• Background and Aims The interaction between the gall-forming grapevine parasite, phylloxera, and the susceptible grapevine species Vitis vinifera was investigated.

• Methods Phylloxera and grapevines were cocultivated using both potted and micropropagated grapevines. Development of nodosities on primary roots was studied by microscopy and histochemistry, and nodosities were analysed for biochemical changes and changes in gene expression.

• Key Results Within a nodosity, phylloxera fed at a site in the root cortex. Nodosity development was characterized by swelling of the root tissue distal to the feeding site, lack of development of a suberized endodermis, and starch and amino acid accumulation, and was eventually followed by root necrosis. No evidence of a defence response was observed in pre-necrotic nodosities, but defence-type responses were observed in tissue adjacent to necrotic regions. Changes in gene expression were not detected by northern hybridization using DNA probes encoding a range of V. vinifera transcripts.

• Conclusions Nodosities on V. vinifera potentially function as nutrient reservoirs, and defence responses to phylloxera attack were not detected.
Key words: Daktulosphaira vitifoliae, phylloxera, Vitis vinifera, grapevine, nodosity, gall formation.


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