Effect of Gamma irradiation on morphology of antennal sensilla of Rhyzopertha dominica (Coleoptera: Bostrichidae)

ABSTRACT The effect of different dose levels of gamma irradiation on the morphology and distribution of the sensory receptors of the antennae of lesser grain borer, Rhyzopertha dominica (F.), was studied with the scanning electron microscope. The results obtained distinguished three types of sensilla: chaetica (ch1“long“ and ch2 ”short”), basiconica (b), and ampucellaceous (am) present on the apical distal three segments of flagellomeres. Irradiation with a dose level of 75 Gy had no effect on the general distribution of different types of sensilla as compared with the control, whereas dose levels of 100, 150, and 200 Gy showed malformation which increased with the increased doses