Patel, B. N.CHOVATIYA, KUNALKUMAR P.2018-06-142018-06-142003http://krishikosh.egranth.ac.in/handle/1/5810052820Investigation on effect of interaction between brinjal mosaic virus and root-knot nematode {Meloidogyne incognita and M. Javanica) on shoot and root growth as well as on major nutrients and total phenols contents of brinjal were carried out. With a view to locate source of resistance, varieties/genotypes of brinjal were also evaluated for their reaction to brinjal mosaic virus under artificially inoculated conditions. Root-knot nematode in singly infected plants had slightly more impact on all growth parameters than brinjal mosaic virus infection; root weight, however, was increased in nematode infected plants because of heavy galling when compared with virus infected plants. Combined infection with brinjal mosaic virus and root-knot nematode had considerably lowered the growth parameters, viz., number of leaves, plant height, leaf length and width, fresh shoot weight and root-length when compared with control or single infection with either pathogens. Simultaneous infection with brinjal mosaic virus and root-knot nematode, however, exhibited more severe impact on all shoot and root growth parameters as compared to the single infections thus indicating that these pathogens had synergistic effect on growth of brinjal. Root-knot index as well as nematode population in roots was higher in the treatment having simultaneous infection, treatment where nematode inoculation followed by virus inoculation and treatment of nematode inoculation alone when compared with the treatment in which virus was inoculated prior to nematode. Root-knot nematode had more drastic effect on all three major nutrients, viz., total nitrogen, phosphorus and potassium than brinjal mosaic virus. Maximum reduction in total nitrogen and potassium content in the treatment of nematode inoculation alone was observed, whereas, maximum reduction in phosphorus was recorded in the treatment having simultaneous infection. Thus, among the three major nutrients, phosphorus was most affected due to interaction effects of root-knot nematode and brinjal mosaic virus. Root-knot nematode had slightly more impact on the total phenols content than brinjal mosaic virus. Total phenols content was reduced in all the interaction treatments but the reduction was more when both pathogens were inoculated simultaneously. Evaluation of brinjal varieties/genotypes revealed that variability existed among them for brinjal mosaic virus infection. Out of sixteen brinjal varieties/genotypes evaluated, only one genotype ABL-98-1 was completely free from infection under artificially inoculated conditions and was considered as highly resistant to brinjal mosaic disease prevailing under Gujarat conditions.enPLANT PATHOLOGY, AGRICULTUREA StudyThesis