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5. Crop wild relative populations of Beta vulgaris allow direct mapping of agronomically important genes

Author

Capistrano-Gossmann, Gina G, Ries, D, Holtgräwe, D, Minoche, A, Kraft, T, Frerichmann, S L M, Rosleff Soerensen, T, Dohm, J C, González, I, Schilhabel, M, Varrelmann, M, Tschoep, H, Uphoff, H, Schütze, K, Borchardt, D, Toerjek, O, Mechelke, W, Lein, J C, Schechert, A W, Frese, L, Himmelbauer, H, Weisshaar, B; https://orcid.org/0000-0002-7635-3473, Kopisch-Obuch, F J, Capistrano-Gossmann, Gina G, Ries, D, Holtgräwe, D, Minoche, A, Kraft, T, Frerichmann, S L M, Rosleff Soerensen, T, Dohm, J C, González, I, Schilhabel, M, Varrelmann, M, Tschoep, H, Uphoff, H, Schütze, K, Borchardt, D, Toerjek, O, Mechelke, W, Lein, J C, Schechert, A W, Frese, L, Himmelbauer, H, Weisshaar, B; https://orcid.org/0000-0002-7635-3473, and Kopisch-Obuch, F J

Abstract

Rapid identification of agronomically important genes is of pivotal interest for crop breeding. One source of such genes are crop wild relative (CWR) populations. Here we used a CWR population of <200 wild beets (B. vulgaris ssp. maritima), sampled in their natural habitat, to identify the sugar beet (Beta vulgaris ssp. vulgaris) resistance gene Rz2 with a modified version of mapping-by-sequencing (MBS). For that, we generated a draft genome sequence of the wild beet. Our results show the importance of preserving CWR in situ and demonstrate the great potential of CWR for rapid discovery of causal genes relevant for crop improvement. The candidate gene for Rz2 was identified by MBS and subsequently corroborated via RNA interference (RNAi). Rz2 encodes a CC-NB-LRR protein. Access to the DNA sequence of Rz2 opens the path to improvement of resistance towards rhizomania not only by marker-assisted breeding but also by genome editing.

Published
2017

6. Crop wild relative populations of Beta vulgaris allow direct mapping of agronomically important genes

Author

Capistrano-Gossmann, Gina G., primary, Ries, D., additional, Holtgräwe, D., additional, Minoche, A., additional, Kraft, T., additional, Frerichmann, S.L.M., additional, Rosleff Soerensen, T., additional, Dohm, J. C., additional, González, I., additional, Schilhabel, M., additional, Varrelmann, M., additional, Tschoep, H., additional, Uphoff, H., additional, Schütze, K., additional, Borchardt, D., additional, Toerjek, O., additional, Mechelke, W., additional, Lein, J. C., additional, Schechert, A. W., additional, Frese, L., additional, Himmelbauer, H., additional, Weisshaar, B., additional, and Kopisch-Obuch, F. J., additional

Published
2017
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9. Sources of resistance to diseases of sugar beet in relatedBetagermplasm: II. Soil-borne diseases.

Author

Luterbacher, M. C., Asher, M. J. C., Beyer, W., Mandolino, G., Scholten, O. E., Frese, L., Biancardi, E., Stevanato, P., Mechelke, W., and Slyvchenko, O.

Subjects
SOILBORNE plant diseases, PLANT diseases, SUGAR beets, APHANOMYCES cochlioides, APHANOMYCES
Abstract

Between 580 and 700 accessions of related cultivated and wild species of the genusBetawere assessed for resistance to four soil-borne diseases of sugar beet: two seedling damping-off diseases caused by the fungiAphanomyces cochlioidesandPythium ultimumand two diseases of more mature plants, Rhizoctonia root and crown rot, caused by the fungusR. solani, and Rhizomania, caused byBeet necrotic yellow vein virus(BNYVV), a furovirus transmitted by the plasmodiophoridPolymyxa 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) toA. cochlioidesandP. ultimumwere to be found amongst accessions of the more distantly related sectionsCorollinae(93% of accessions tested) andProcumbentes(10%), respectively; although useful levels could also be found in the more closely related, and sexually compatible, sectionBeta(1-6%). Resistance to Rhizoctonia was also found in sectionBeta(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 sectionsCorollinaeandProcumbentesexhibited any notable resistance to Rhizoctonia. However, all sectionsProcumbentesand some sectionsCorollinae(4%) accessions were highly resistant to Rhizomania. Individuals with high levels of resistance to Rhizomania were identified from within some sectionBetaandCorollinaeaccessions, in which there was evidence of segregation. [ABSTRACT FROM AUTHOR]

Published
2005
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