Publication Date
1985
Description
A Florida ecotype of Aeschynomene americana L. has been identified as a desirable forage legume. A program of genetic improvent has been initiated to develop an improved cultivar in terms of various agronomic traits. As a component of this program 73 lines were evaluated for their response to three common root knot nematode species in greenhouse and field experiments. Plants in the first greenhouse experiment were grown individually in 50 cm3 plastic tubes, infested with 9 eggs per cm3 soil of Meloidogyne arenaria race 1, M. incognita race 3, and M. javanica after 3 weeks growth. Eight weeks later they were rated for severity of galling. This greenhouse experiment was repeated two years later using 150 cm3 plastic tubes. Eleven lines also were planted in greenhouse flats and artificially infested with the nematode species used in the greenhouse plus a non infested control. The plants were transplanted to the field and sampled near the end of the growing season for dry matter yield and severity of galling. Response of the Aeschynomene lines was variable and no line was found which was highly resistant to all three nematode species. However several lines were identified with resistance to two of the nematode species. Thirty-eight percent of the Jines exposed to M. arenaria had mean gall scores of less than 2.0 (i.e. < 10 galls per root system), whereas only 7 and 5 percent had scores of less than 2.0 in response to M. incognita and M. javanica, respectively. The responses of the 11 selected lines in the field experiment were similar to the greenhouse experiments except that for some Jines had lower gall scores for M. javanica in the field.
Citation
Quesenberry, K H.; Hardy, S R.; and Dunn, R A., "Evaluating Aeschynomene americana L. Germplasm for Response to Meloidogyne spp." (2025). IGC Proceedings (1989-2023). 22.
https://uknowledge.uky.edu/igc/1989/session14/22
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Evaluating Aeschynomene americana L. Germplasm for Response to Meloidogyne spp.
A Florida ecotype of Aeschynomene americana L. has been identified as a desirable forage legume. A program of genetic improvent has been initiated to develop an improved cultivar in terms of various agronomic traits. As a component of this program 73 lines were evaluated for their response to three common root knot nematode species in greenhouse and field experiments. Plants in the first greenhouse experiment were grown individually in 50 cm3 plastic tubes, infested with 9 eggs per cm3 soil of Meloidogyne arenaria race 1, M. incognita race 3, and M. javanica after 3 weeks growth. Eight weeks later they were rated for severity of galling. This greenhouse experiment was repeated two years later using 150 cm3 plastic tubes. Eleven lines also were planted in greenhouse flats and artificially infested with the nematode species used in the greenhouse plus a non infested control. The plants were transplanted to the field and sampled near the end of the growing season for dry matter yield and severity of galling. Response of the Aeschynomene lines was variable and no line was found which was highly resistant to all three nematode species. However several lines were identified with resistance to two of the nematode species. Thirty-eight percent of the Jines exposed to M. arenaria had mean gall scores of less than 2.0 (i.e. < 10 galls per root system), whereas only 7 and 5 percent had scores of less than 2.0 in response to M. incognita and M. javanica, respectively. The responses of the 11 selected lines in the field experiment were similar to the greenhouse experiments except that for some Jines had lower gall scores for M. javanica in the field.
