This study was conducted to evaluate the sensitivity of the ELISA technique in detecting four economically important viruses, namely barley stripe mosaic (BSMV), cucumber green mottle mosaic (CGMMV), bean common mosaic (BCMV), and squash mosaic (BSMV) viruses in single seeds as well as in batches of barley, cucumber, bean and squash seeds, respectively. Results indicated the suitability of the technique in detecting the above viruses in single germinated seeds or embryos. Accordingly, seed transmission rates of BSMV, CGMMV, BCMV and SqMV were found to be 67 %, 17%, 17% and 12%, respectively. In artificially contrived mixtures of infected: healthy seeds or embryos, BSMV, CGMMV, BCMV and SqMV were successfully detected at ratios of 1 : 500, 1 : 25, 1 : 10 and 1 : 10, respectively. Sensitivity of detection was increased in the ease of BSMV by using germinated rather than ground dry BSMV‐infected barly seeds; and in the case of SqMV, by using whole germinating emybryos rather than coleoptiles only. Trials on re‐using the enzyme‐γ‐globulin conjugate indicated that CGMMV conjugate used once can be re‐used with little loss in reactivity.
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