Comparative studies on some isolates of fungi responsible for soybean root, foliage diseases and response of some cultivars to infection [electronic resource].

Includes reference.

Soybean (Glycine max (L.) Merr.) is able to injection with several diseases, such as damping-ojf. root-rot and anthracnose. Survey of these diseases in 2001 and 2002 growing seasons, indicated their presence in six governorates. Rhizoctonia solani, Fusarium solani, Marophomina phaseolina and Colletotrichulll dematium were the main pathogens. Anastomosis groups test was used to identify R. solani isolates. This method revealed that all R. solani isolates are multinucleated and were classified into two anastomosis groups. The main pathogenic isolates were determined by using RAPD. Under greenhouse conditions,the eight tested soybean cultivars were different in their reactions to these diseases. Crawford and Giza 82 cultivars were the least susceptible (0 root-rot and anthracnose diseases, respectively, while Giza 21 cultivar was the most susceptible to both diseases. All cultivars tested varied in their protein patterns. There were remarked changes in protein patterns of all cultivars infected with R. solani, .Ivf. phaseolina and C. domatium. Crawford, Giza 21 cultivars (healthy and infected samples) and R. solani have unique band at molecular weight 19. While, Crawford, Giza 21 cultivars (healthy and infected samples) and ivf. phaseolina have unique band at molecular weight 33. Also, Giza 82, Giza 21 cultivars (healthy and infected samples) and C. domatium have unique band at molecular weight 34.

Summary in Arabic.

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