<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>Sixteen <italic>Meloidogyne</italic> isolates from tomato fields in California grown with resistant cultivars were multiplied on resistant tomato in a greenhouse. Of these resistance-breaking isolates, one was identified as <italic>M. javanica</italic>, and all others as <italic>M. incognita.</italic> The reproduction of the <italic>M. javanica</italic> isolate and four <italic>M. incognita</italic> isolates on six resistant tomato cultivars and on susceptible and resistant cultivars of pepper, sweetpotato, green bean, cotton, and cowpea was evaluated and compared to an avirulent <italic>M. incognita</italic> population in greenhouse pot trials. On resistant tomato cultivars, there were minor but significant differences between the resistance-breaking <italic>Meloidogyne</italic> isolates and between the different tomato cultivars. Of the other resistant crop cultivars, pepper was resistant to all isolates and green bean to all <italic>M. incognita</italic> isolates, while cotton and cowpea allowed reproduction of one of the resistance-breaking <italic>M. incognita</italic> isolates. The resistant sweetpotato cv. Bonita behaved like resistant tomato, allowing reproduction of all five resistance-breaking isolates but not of the avirulent <italic>M. incognita</italic>. Our results showed that variability exists among resistance-breaking <italic>Meloidogyne</italic> isolates, and that isolates overcoming resistance in tomato may also be virulent on resistant sweetpotato.</p>
</abstract>

Sixteen Meloidogyne isolates from tomato fields in California grown with resistant cultivars were multiplied on resistant tomato in a greenhouse. Of these resistance-breaking isolates, one was identified as M. javanica, and all others as M. incognita. The reproduction of the M. javanica isolate and four M. incognita isolates on six resistant tomato cultivars and on susceptible and resistant cultivars of pepper, sweetpotato, green bean, cotton, and cowpea was evaluated and compared to an avirulent M. incognita population in greenhouse pot trials. On resistant tomato cultivars, there were minor but significant differences between the resistance-breaking Meloidogyne isolates and between the different tomato cultivars. Of the other resistant crop cultivars, pepper was resistant to all isolates and green bean to all M. incognita isolates, while cotton and cowpea allowed reproduction of one of the resistance-breaking M. incognita isolates. The resistant sweetpotato cv. Bonita behaved like resistant tomato, allowing reproduction of all five resistance-breaking isolates but not of the avirulent M. incognita. Our results showed that variability exists among resistance-breaking Meloidogyne isolates, and that isolates overcoming resistance in tomato may also be virulent on resistant sweetpotato.

Tomato <italic>Mi</italic>-gene Resistance-Breaking Populations of <italic>Meloidogyne</italic> Show Variable Reproduction on Susceptible and Resistant Crop Cultivars

Journal of Nematology

This work is licensed under the Creative Commons Attribution 4.0 International License.

Tomato -gene Resistance-Breaking Populations of  Show Variable Reproduction on Susceptible and Resistant Crop Cultivars

Sixteen Meloidogyne isolates from tomato fields in California grown with resistant cultivars were multiplied on resistant tomato in a greenhouse. Of these...

Tomato Mi-gene Resistance-Breaking Populations of Meloidogyne Show Variable Reproduction on Susceptible and Resistant Crop Cultivars

Article Category: Research Paper

Published Online: Oct 16, 2023

Page range: -

Received: May 10, 2023

DOI: https://doi.org/10.2478/jofnem-2023-0043

Keywords
cotton, green bean, pepper, resistance breaking, root-knot nematodes, sweetpotato, tomato

© 2023 A. T. Ploeg et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Tomato Mi-gene Resistance-Breaking Populations of Meloidogyne Show Variable Reproduction on Susceptible and Resistant Crop Cultivars

Article Category: Research Paper

Published Online: Oct 16, 2023

Page range: -

Received: May 10, 2023

DOI: https://doi.org/10.2478/jofnem-2023-0043

Keywordscotton, green bean, pepper, resistance breaking, root-knot nematodes, sweetpotato, tomato

© 2023 A. T. Ploeg et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
cotton, green bean, pepper, resistance breaking, root-knot nematodes, sweetpotato, tomato