Sources of resistance to diseases of sugar beet in related Beta germplasm: II. Soil-borne diseases |
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| Authors: | M C Luterbacher M J C Asher W Beyer G Mandolino O E Scholten L Frese E Biancardi P Stevanato W Mechelke O Slyvchenko |
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| Institution: | (1) Broom s Barn Research Station, Higham, Bury St. Edmunds, Suffolk, IP28 6NP, U.K.;(2) KWS SAAT AG, Postfach 1463, D-37555 Einbeck, Germany;(3) Istituto Sperimentale per le Colture Industriali, Via di Corticella 133, 40129 Bologna, Italy;(4) Plant Research International, P.O. Box 16, 6700 AA, The Netherlands;(5) Bundesanstalt für Züchtungsforschung an Kulturpflanzen Gene Bank, Bundesallee 50, D-38116 Braunschweig, Germany;(6) Institute for Sugar Beet of the UAAS, Klinichna 25, 03141 Kiev, Ukraine |
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| Abstract: | Between 580 and 700 accessions of related cultivated and wild species of the genus Beta were assessed for resistance to four soil-borne diseases of sugar beet: two seedling damping-off diseases caused by the fungi Aphanomyces cochlioides and Pythium ultimum and two diseases of more mature plants, Rhizoctonia root and crown rot, caused by the fungus R. solani, and Rhizomania, caused by Beet necrotic yellow vein virus (BNYVV), a furovirus transmitted by the plasmodiophorid Polymyxa betae. Analysis of resistance data (assessed on an international standardised 1–9 scale of Resistance Scores) indicated that the highest levels of resistance ({RS} 2) to A. cochlioides and P. ultimum were to be found amongst accessions of the more distantly related sections Corollinae (93% of accessions tested) and Procumbentes (10%), respectively; although useful levels could also be found in the more closely related, and sexually compatible, section Beta (1–6%). Resistance to Rhizoctonia was also found in section Beta (5–7%), depending on whether field or glasshouse tests were used, but there was little evidence of generally high levels of resistance to Rhizomania among accessions of this section. None of the accessions of sections Corollinae and Procumbentes exhibited any notable resistance to Rhizoctonia. However, all sections Procumbentes and some sections Corollinae (4%) accessions were highly resistant to Rhizomania. Individuals with high levels of resistance to Rhizomania were identified from within some section Beta and Corollinae accessions, in which there was evidence of segregation. |
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| Keywords: | Aphanomyces cochlioides beet necrotic yellow vein virus Beta species Pythium ultimum resistance Rhizoctonia solani Rhizomania sugar beet |
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