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Influence of Sweetpotato Resistance on the Development of and . | LitMetric

and are major pests of sweetpotato. The ability of to cause symptoms and reproduce on nematode-resistant cultivars threatens the sweetpotato industry. To evaluate the penetration, development, and reproduction of and on sweetpotato, a time-course study was conducted using the genotypes 'LA14-31' (resistant to and intermediate-resistant to ), 'LA18-100' (susceptible to and resistant to ), and 'LA19-65' (resistant to and susceptible to ), with 'Beauregard' (susceptible to both species) and 'Jewel' (resistant to and intermediate-resistant to ) as controls. Sweetpotato roots were collected at 7-, 9-, 11-, 13-, 21-, and 35-days post-inoculation (DPI), stained with acid fuchsin, and analyzed for nematode developmental stages. Nematode reproduction was evaluated by examining egg production at 42 DPI. Results showed that developed and reproduced only in 'Beauregard' and 'LA18-100'. In resistant genotypes such as 'Jewel', 'LA14-31', and 'LA19-65', remained at the pre-parasitic J2-stage, with halted development linked to localized cell death in response to penetration. For , the defense response was most notable in 'LA18-100', where infective juveniles either died, matured as males, or experienced delayed development into adult females, with a marked reduction in reproduction. These findings suggest that resistance to likely involves a hypersensitive-like response that prevents feeding site establishment, whereas resistance to appears quantitative, as evidenced by delayed nematode development and reduced reproduction in resistant genotypes.

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http://dx.doi.org/10.1094/PHYTO-11-24-0365-RDOI Listing

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