ANTIGENIC DIFFERENCES BETWEEN CERTAIN UNINOCULATED AND INOCULATED RICE CULT1VARS WITH PYRICULARIA ORYZAE CAV.

Document Type : Original Article

Authors

1 Botany Department, Faculty of Agricultural, Kafr EI-Sheikh, Tanta University, Egypt

2 Plant Pathology Research Institute, Sakha Agricultural Research Station, Egypt

Abstract

Uninoculated and inoculated plants of three rice cultivars namely Reiho (blast-susceptible), GZ 2175-5-6 (Promising lines) and IR 28 (resistant) with Pyricularia oryzae were differentiated serologically by us­ing double gel diffusion (DGD) and crossed immunoelectrophoresis (CIE) techniques. Differences in the antigenic structures were found between inoculated and uninoculated plants of Reiho and GZ 2176-5-6, since three and one antigens were not detected in the inoculated plants, re­spectively. Fourteen antigens were detected in the homologous reac­tions of uninoculated Reiho and GZ 2175-5-6, while 11 and 13 antigens were detected in the inoculated plants respectively. In contrast, no anti­genic changes were found following inoculation of resistant cv. IR 28 since 14 antigens were detected in both homologous and heterologous reactions. On the other hand, the serological relationship between the three cultivars were determined according to the antigens common among them. IR 28 was serologically more related to GZ 2175-5-6 than Reiho, where 12 and 8 antigens were in common respectively. Results revealed that the antigenic differences between inoculated and uninocu­lated rice cultivars were associated with the cultivar susceptibility.

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