Resistance to Bacterial Wilt in Solanum commersonii Dun.

Authors

  • Matías González Instituto Nacional de Investigación Agropecuaria (INIA), Estación Experimental Salto Grande Camino al Terrible, Salto, Uruguay
  • Guillermo Galván Universidad de la República, Facultad de Agronomía, Departamento de Producción Vegetal, Canelones, Uruguay
  • María Inés Siri Universidad de la República, Facultad de Química, Departamento de Biociencias, Montevideo, Uruguay
  • Alejandra Borges Universidad de la República, Facultad de Agronomía, Unidad Biometría, Estadística y Cómputos, Montevideo, Uruguay
  • Francisco Vilaró Instituto Nacional de Investigación Agropecuaria (INIA), Estación Experimental INIA Las Brujas, Canelones, Uruguay

DOI:

https://doi.org/10.31285/AGRO.26.1092

Keywords:

inoculation, bacterial wilt, Ralstonia solanacearum, Solanum tuberosum, disease resistance

Abstract

The levels of resistance to bacterial wilt (BW) of potatoes caused by Ralstonia solanacearum (Rs) are limited. Solanum commersonii (cmm) is a wild tuber-bearing potato highlighted for its resistance to BW. This research aimed to (i) characterize cmm genotypes for resistance to Rs (race 3, biovar 2) using a soil inoculation method, (ii) determine to what extent resistance in cmm is transmissible through sexual reproduction to a susceptible genetic background, and (iii) determine the relationships between a set of Rs strains (race 3, biovar 2) and cmm genotypes in the expression of resistance. The screening was performed under controlled conditions of temperature and light. Accessions collected from different regions of Uruguay showed diversity for resistance to BW: some genotypes were asymptomatic in the response, while for others the symptoms were similar to the susceptible control. Two cmm genotypes with contrasting responses to BW were crossed, and an offspring of 121 genotypes was obtained. The distribution of BW resistance levels in the progeny suggested a polygenetic control for BW resistance; though this conclusion is preliminary regarding that one of the cmm parents was triploid. A factorial experiment using five R. solanacearum strains isolated in Uruguay and five cmm clones showed differences in the virulence between strains. There was no interaction between plant genotype and bacterial isolate, and therefore, under the conditions of this research, BW resistance in cmm was not dependent on the isolate of the pathogen.

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Published

2022-07-21

How to Cite

1.
González M, Galván G, Siri MI, Borges A, Vilaró F. Resistance to Bacterial Wilt in Solanum commersonii Dun. Agrocienc Urug [Internet]. 2022 Jul. 21 [cited 2024 Apr. 22];26(NE2):e1092. Available from: https://agrocienciauruguay.uy/index.php/agrociencia/article/view/1092

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Section

Plant Biology
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