Abstract
The objective of this study was to evaluate sweet potato clones for resistance to root-knot nematode, Meloidogyne incognita races 1 and 3. For each nematode physiological race, a greenhouse experiment was set up in a randomized block experimental design with three replications and six plants per plot. Fifty-eight sweet potato clones from the UFVJM germplasm bank were evaluated, plus five commercial cultivars (Brazlândia Rosada, Brazlândia Branca, Palmas, Princesa and Coquinho), plus the cv. Santa Clara tomato (susceptible to Meloidogyne spp.). Stems were planted in 72-cell expanded polystyrene trays, filled with commercial substrate and inoculated with the pathogen thirty days after planting. Forty-five days after inoculation, the eggs were extracted, counted, and later evaluated. Resistance level classification was performed based on reproduction factor (RF) and reproduction index (RI). Among the 63 analyzed clones, a percentage of 78% were classified as resistant to M. incognita race 1.79% to race 3 and 67% showed multiple resistance to both M. incognita races.
Highlights
The sweet potato, Ipomoea batatas (L.) Lam., is a vegetable of great social, economic and nourishing importance, especially for the poorest regions of the planet, where it is one of the most important food sources (Oliveira et al, 2005).Despite showing high yield potential, Brazilian yield is still low, due to - among other problems - the little care in crop management, the planting of obsolete and degenerated genetic materials and the use of cultivars which in their majority are susceptible the root-knot nematode (Marchese et al, 2010; Kalkmann et al, 2013)
Resistance of sweet potato clones to nematodes from 11 to 25%; very resistant plant (VR), reproduction index (RI) from 1 to 10%; and highly resistant/ immune (HR/I), RI below 1%
Genetic variation coefficient values were considered superior to environmental ones, indicating plant selection as a good tool (Gonçalves et al, 2012)
Summary
The sweet potato, Ipomoea batatas (L.) Lam., is a vegetable of great social, economic and nourishing importance, especially for the poorest regions of the planet, where it is one of the most important food sources (Oliveira et al, 2005).Despite showing high yield potential, Brazilian yield is still low, due to - among other problems - the little care in crop management, the planting of obsolete and degenerated genetic materials and the use of cultivars which in their majority are susceptible the root-knot nematode (Marchese et al, 2010; Kalkmann et al, 2013). Among the major sweet potato pests, root-knot nematodes, Meloidogyne spp., are one of the most destructive for the crop. They are widely distributed and present higher problems when cultivated in tropic, subtropic and warm temperature regions worldwide (Jatala, 1991), being considered one of the determining factors for Brazilian low yield (Neves et al, 2010). According to Rosa et al (2013), among the major nematode species found in areas for vegetable crops, M. incognita and M. javanica may be found concurrently or separately. Meloidogyne incognita is the most important nematode species that attacks sweet potato, and the only Meloidogyne species with global distribution (Jatala, 1991)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
