Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: January 4, 2005
Publication Date: June 1, 2005
Citation: Lafoe, J.M., Jenkins, J.N., McCarty Jr., J.C., Gutierrez, O.A., Robinson, A.F. 2005. Resistance to reniform nematode in exotic cotton lines [abstract]. National Cotton Council Beltwide Cotton Conference. p.1068. Technical Abstract: Reniform nematode has caused significant yield reductions for many years in cotton production across the Mid-South. Without any resistant cultivars available at this time, crop rotation and the use of insecticides/nematicides are the only means of reducing the amount of infestation in the fields. The objectives of this study were: 1) to evaluate eight Gossypium arboreum accessions for reniform nematode resistance, 2) to evaluate the inheritance of resistance to reniform nematodes in selected G. arboreum accessions, and 3) to evaluate selected Gossypium hirsutum day neutral plant selections for resistance to reniform nematode. Seven G. arboreum accessions (A2-076, A2-113, A2-019, A2-144, A2-159, A2-190, and A2-194) were crossed with susceptible A2-082. Individual F2 plants from crosses A2-190 x A2-082 and A2-019 x A2-082 were evaluated for reniform nematode resistance. The G. hirsutum day neutral plant selections MT 2468, MT 2469, and MT 1348 were also evaluated for resistance to reniform nematodes. Plants were evaluated under greenhouse conditions. Three reniform nematodes g-1 of soil were added to the sand mixture, which consisted of a fine mason sand (<400µm). Nematodes were extracted from the soil using the Baermann Funnel technique. Nematode reproduction was expressed as the number of reniform nematodes g-1 soil. Resistance was confirmed in each of 7 G. arboreum accessions. The F2 progeny of A2-190 x A2-082 and A2-019 x A2-082 showed similar results for resistance. Preliminary results indicated that partial dominance may be involved in the inheritance of resistance to reniform nematodes. A preliminary test of individual plants of day neutral G. hirsutum was evaluated for resistance, and 7 out of 116 plants were saved for further evaluation. Seed of the seven day neutral plants MT 2468 and two MT 1348 plants were evaluated for a level of resistance. A level of resistance was recorded in several plants within MT 2468 and MT 1348.