Identification and Characterization of Potato Zebra Chip Resistance Among Wild Solanum Species

Abstract

Potato zebra chip (ZC) disease, associated with the uncultured phloem-limited bacterium, Candidatus Liberibacter solanacearum (CLso), is transmitted by the potato psyllid Bactericera cockerelli. Potato ZC disease poses a significant threat to potato production worldwide. Current management practices mainly rely on the control of the psyllid to limit the spread of CLso. The present study investigated new sources of ZC resistance among wild Solanum species. A taxonomically diverse collection of tuber-bearing Solanum species was screened; one ZC-resistant accession and three ZC-tolerant accessions were identified among the 52 screened accessions. Further characterization of the resistant accession showed that the resistance was primarily associated with antibiosis effects due to differences in leaf trichome density and morphology of the wild accession, which could limit the psyllid feeding and oviposition. This germplasm offers a good resource for further understanding ZC and psyllid resistance mechanisms, contributing to potato breeding efforts to develop ZC resistance cultivars. Alternatively, it could be used as a potential trap crop to manage psyllid and control ZC disease.

Potato soup: analysis of cultivated potato gene bank populations reveals high diversity and little structure

“…The USDA potato genebank in Sturgeon Bay WI is the most accessible repository of this germplasm for US breeders. Screening the genebank collection has identified new resistance alleles for pests and pathogens such as late blight ( Karki et al., 2021 ), zebra chip ( Mora et al., 2022 ), and Colorado potato beetle ( Jansky et al., 2009 ). However, the genebank contains almost 2,000 accessions of cultivated potato and screening all of them is prohibitively difficult.…”

Effect of antibiosis, antixenosis and natural variation of trichomes of wild and commercial tomato species on the development of Bactericera cockerelli

“…Las plantas solanáceas pueden producir una amplia gama de metabolitos secundarios que pueden afectar a las poblaciones de artrópodos (Panizzon et al, 2022), los mecanismos de resistencia en especies silvestres de tomates son asociados con la presencia de tricomas foliares (glandulares o no glandulares) y con el tipo de sustancia que estos almacenan como acilazúcares, metilcetonas y sesquiterpenos (Marchant et al, 2020;Wang et al, 2021;Moghe et al, 2023), los cuales actúan como defensas físicas y químicas que afectan negativamente el comportamiento y la aptitud biológica de los herbívoros (Rodríguez-López et al, 2020;Paudel et al, 2022). Mora et al (2022), en la selección de 52 especies silvestres de Solanum (papas), obtuvieron como resultado la identificación de una accesión resistente a Candidatus Liberibacter solanacearum y varias muestras tolerantes. La accesión resistente fue S. berthaultii que dentro de sus cualidades presenta densos tricomas glandulares en la superficie adaxial (12 tricomas/mm 2 ) y abaxial (7 tricomas/mm 2 ) de hojas; además de sugerir que esta característica pueda ser la responsable de la reducción de la fecundidad y supervivencia de B. cockerelli.…”