SoyBase Follow us on Twitter @SoyBaseDatabase
Integrating Genetics and Genomics to Advance Soybean Research



Reference Report for CAIN789097383
Title:Tobacco ringspot virus and Rhizobium [japonicum] interactions in soybean:impairment of leghemoglobin accumulation and nitrogen fixation
Authors:Orellana, R.G., Fan, F., Sloger, C.
Source:Phytopath. 1978, 68(4):577-582
Abstract:TRSV-infected and noninfected Harosoy soybeans grown in the glasshouse with R. japonicum-110 seed-inoculant were studied during prebloom, bloom and seed-set, bloom and early pod, pod-fill and mature-pod stages. The effects of the disease relative to non-infected plants were: the virus significantly reduced top, root and nodule growth; nodulation and hence symbiotic activity were nearly or completely suppressed until the plants were c. 40 days old and were in the bloom and early pod stage; after nodulation started, nodule fresh wts. were reduced 85, 67 and 67% in last 3 growth stages; leghemoglobin (LH) content decreased 3% during the bloom and early pod stage but increased 33 and 25% during the successive pod-fill and mature-pod stages respectively; nitrogen-fixation rates (fresh wt.) were increased 30, 99 and 57% respectively, during the last 3 growth stages as the plants aged; however nitrogen-fixation rates calculated on plant basis for the same stages decreased 81, 41 and 23%; and TRSV-infected plants remained green 2-3 weeks longer than noninfected controls. The results show that the disease severely delays nodulation and interferes with the efficiency of the nitrogen fixation process. The delayed, although increased, specific activity of TRSV-infected nodules would be too late to promote yield. ADDITIONAL ABSTRACT: Tobacco ringspot virus (TRSV)-infected and non-infected soyabean cv. Harosoy plants inoculated with Rhizobium japonicum were studied in the glasshouse at different growth stages. Av. fresh root wt., fresh top wt. and fresh nodule wt. were reduced by TRSV infection. Nodulation was nearly or completely suppressed until plants were 40 days old. During the early-pod, pod-fill and mature-pod stages, N fixation rate/nodule was increased although N fixation rate/plant decreased. Leghaemoglobin content increased by 3% in the pod-fill stage and 25% in the mature-pod stage. However, the delayed, but increased, specific activity of TRSV-infected nodules would occur too late to promote yield.






Funded by the USDA-ARS. Developed by the USDA-ARS SoyBase and Legume Clade Database group at the Iowa State University, Ames, IA
 
USDA Logo
Iowa State University Logo