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Submitted to: Journal of Nematology
Publication Type: Abstract Only Publication Acceptance Date: 7/20/2015 Publication Date: 9/1/2015 Citation: Stetina, S.R. 2015. Development of Rotylenchulus reniformis differs on resistant Gossypium barbadense accessions TX 110 and GB 713. Journal of Nematology. 47:270. Interpretive Summary: Technical Abstract: Two Gossypium barbadense lines (cultivar TX 110 and accession GB 713) have been used to develop G. hirsutum (cotton) germplasm lines with resistance to reniform nematode (Rotylenchulus reniformis). Their effects on reniform nematode development and fecundity were documented in three repeated growth chamber experiments, with susceptible G. hirsutum cultivar Deltapine 16 as a control. Nematode development on roots early (1 to 5 days after inoculation; DAI) and late (5 to 25 DAI) in the infection cycle was measured at set intervals. Genotypes were compared based on the number of nematodes in four developmental stages (vermiform, swelling, reniform, gravid). Egg production by individual females parasitizing each genotype was measured at 15, 20 and 25 DAI. Early in the infection cycle, development occurred one day faster on susceptible cotton than on the resistant genotypes. Progression to the reniform and gravid stages of development later in the infection cycle occurred first on the susceptible genotype, followed by G. barbadense cultivar TX 110, and finally G. barbadense accession GB 713. There were no significant differences in egg production by nematodes infecting the three genotypes. This study is the first report of delayed development associated with G. barbadense accession GB 713, and the different developmental patterns in this genotype and G. barbadense cultivar TX 110 suggest that unique or additional loci may confer resistance in these two lines. |
