103-4
Screening Improved Wheat-Lines for Plant-Parasitic Nematode Resistance.

Monday, November 4, 2013: 8:45 AM
Tampa Convention Center, Room 25, First Floor

Martin Moluwa Matute, Biology, University of Arkansas, Pine Bluff, AR and Arron H. Carter, Washington State University, Pullman, WA
Improved wheat lines were field screened for plant-parasitic nematode resistance and tolerance. There were three planting sites and 10 random composite soil samples were collected from each field preplant and at harvest. The plant-parasitic nematodes recovered were of two colonizer-persister(cp) classes-cp2/Pl2 and cp3/Pl3.  At harvest  the Pl2 nematodes  recorded were Tylenchus(42.42%), Psilenchus(54.95%), and Paratylenchus(2.72%) and the Pl3 were  Pratylenchus (50.17%) , Heterodera (23.24%), Hoplolaimus (11.79%), Meloidogyne(10.41%), and Tylenchorhynchus( 4.39%). The initial and final Pl2 nematode populations were as follows:  Almota- 365.9 v 167.9, Colton-41.3 v 105.2, and Mokanema-49.9 v 112.8, Pl2 nematodes per 100 mL soil sample. In Almota Pl2 nematode populations decreased by 117.93 %( P=0.01), in Colton Pl2 nematode populations increased by 154.72 %( P=0.01), and in Mokanema the final population increased by 126.05 %( n.s). For Pl3 nematodes, the final Almota population was reduced to 77.45% of the initial population (292.2 v 226.3) and in Colton the final population increased by 19.49%. On the other hand, the final Pl3 nematode populations in Mokanema increased by 351.93 %( P= 0.001; 90.7 v 409.9). The mean number of Pl2 nematodes recorded at harvest, were; 105.2 < 112.8 < 167.9, respectively for Colton-winter wheat, Mokanema-spring wheat, and Almota-winter wheat. For the Pl3 nematodes it was 226.3 < 276.5 < 409.9, respectively for Almota, Colton, and Mokanema. Pl3 nematodes are bigger than Pl2 nematodes and therefore more destructive.  Means therefore of 226.3 to 409.9 Pl3 nematodes per 100 mL soil sample are 2 to 4x the number of nematodes considered economic thresh hold, requiring management. A study that will include soil analysis is required to account for location differences.
See more from this Division: C03 Crop Ecology, Management & Quality
See more from this Session: Crop Ecology, Management and Quality Papers

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