دامنه ميزباني و انتقال ويروس موزاييك اقليد گندم

Wheat Eqlid mosaic virus (WEqMV) induces mosaic, streaks, and stripes on leaves and reduction of growth in wheat in the Eqlid region of Fars. About 30% of mosaic symptoms in wheat in this region is due to WEqMV. Setaria viridic, .Scale cereale, Bromuc sterlic and Echinoehloa eolona were found to be other natural hosts of WEqMV in the area and showed mosaic symptoms. Barley, rye, maize, sorghum, oat, 30 other gramineous species and seven dicotyledonous plants were mechanically inoculated with the virus under greenhouse conditions. Only barley and rye showed mosaic symptoms and together with symptomless Hordeum morinum were ELISA positive for WEqMV. Eleven varieties of common wheat, a durum wheat and Triticum turgidum were evaluated for their sensitivity to mechanical inoculation with WEqMV. There were significant differences among varieties of common wheat in the rate of infection and ELISA values of their crude sap. Darab variety of bread wheat and T. turgidum showed maximum and minimum infection rates, while Marvdasht and Omid varieties had maximum and minimum ELISA values, respectively. In a search for WEqMV vector, no indication of Polymyxa graminis was found when 221 roots of field collected wheat with mosaic symptoms (including 67 samples of ELISA positive for WEqMV) were examined under microscope. Wheat seeds planted adjacent to infected plants or soil samples from infected field did not develop into diseased plants. Aceria tulipae (wheat curl mite), Aceria sp. (Eriophyes sp.) (Bermuda grass mite), and the aphids Sitobion avenae, Sipha maydis, Schizaphis graminum, Metopolophium dirhodum, Rhopalosiphum padi and Diuraphis noxia failed to transmit the virus under greenhouse conditions. Only the wheat root aphid Forda marginata was able to transmit the virus.