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Published in Crop Sci 27:1234-1237 (1987)
© 1987 Crop Science Society of America
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Variability among Desmodium Species for Response to Root-Knot Nematodes1

K. H. Quesenberry and R. A. Dunn2

Several Desmodium spp. have shown potential for use as pasture legumes in Florida and areas of the tropics. Previous research has shown that root-knot nematodes (Meloidogyne spp.) are a limiting factor for production of certain of these species. The objectives of this research were: (i) to evaluate the responses of germplasm introductions of six Desmodium spp. to three Meloidogyne spp., and (ii) to determine the effects of the plants on nematode reproduction. Germplasm lines were evaluated in three greenhouse experiments. Two to 3 week-old-seedlings were infected with 1500 Meloidogyne spp. eggs plant–1 and scored for root galling (GS) and nematode egg masses (ES) after 8 weeks. Variability in GS and ES was identified within and among species. Ten lines of D. intortum (Mill.) Urb. and three of D. uncinatum (Jacq.) DC. were highly resistant to M. arenaria race 1 (Neal) Chitwood, M. incognita race 3 (Kofoid and White) Chitwood, and M. javanica (Treub) Chitwood, but one line of D. uncinatum had an intermediate response. Desmodium barbatum (L.) Beuth., D. heterocarpon (L.) DC., D. ovalifolium Wall., and D. strigolosum Schindler all varied among lines, with GS ranging from 0.1 to 5.0. Nematode egg mass (ES) was generally highly correlated with GS. Individual lines within a species often varied in GS and ES in response to the different root-knot species. Desmodium spp. germplasm being considered for release or use in a breeding project in areas with known root-knot nematode infestation should be evaluated for response to the local Meloidogyne spp.

Key Words: Desmodium keterocarpon • D. Ovalifolium • D. strigolosum • D. barbatum • D. intortum • D. uncinatum • Meloidogyne arenaria • M. incognita • M. javanica • Germplasm evaluation • Nematode resistance

1 Contribution from the Dep. of Agronomy, Univ. of Florida, Gainesville, FL 32611. Journal series no. 7844. This research was partially supported by USDA-Cooperative State Res. Serv. (CSRS) Special Grant 83-CRSR-2-2134.

2 Professors of agronomy and of nematology, respectively, Univ. of Florida, Gainesville, FL 32611.

Received for publication December 22, 1986.




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