IDENTIFICATION AND MOLECULAR STUDIES ON Cucumber mosaic VIRUS IN IRAQ.

Abstract

The objective of the study is to characterize new strain of Cucumbermosaic cucumovirus (CMV), based on symptoms on indicator plants,serological characteristics and the molecular weight of virus coat proteinson SDS-polyacrylamide gel electrophoresis. Leaves from symptomaticcucumber plants were extracted with 0.01 M phosphate buffer andmechanically inoculated on cucumber plants, and those exhibited mosaicsymptoms were used as virus source. A number of indicator plants weremechanically inoculated with an extract of symptomatic leaves. The viruswas extracted and purified from cucumber infected plants. Samples frompure virus preparation were analyzed on polyacrylamide gel containingSDS by electrophoresis. A part of symptomatic leaves was treated withanti-CMV polyclonal antibodies by Immunocromatography. Resultsshowed that the virus induced chlorotic local lesions on the inoculatedleaves of Nicotiana tabacum cv. Xanthi, and mosaic on beans. Aprecipitation line was appeared on the Immunostrip treated withsymptomatic leaf extracts, this line is absent on immunostrip treated withasymptomatic leaves. The analysis of purified virus and on SDSpolyacrylamidegel electrophoresis revealed two protein bands of 24 and26 Kd. These results indicate that the virus under study is CMV. Theresponded of N. tabacum Xanthi to virus inoculation by chlorotic lesions,and the apparition of 2 protein bands on acrylamide gel representing themolecular weights of virus coat protein indicates a new strain of CMV inIraq.