The effect of gamma irradiation on the Varo race of Bombyx mori L. II. Irradiation of eggs in the early and late embryonic stages

Gubicza, András and Molnár, István (1964) The effect of gamma irradiation on the Varo race of Bombyx mori L. II. Irradiation of eggs in the early and late embryonic stages. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 31. pp. 3-13. ISSN 0365-3005

Preview

Text 5_cut_MTA_TihanyiBiologiaiKutIntEvkonyve_31.pdf Download (8MB) | Preview

Abstract

Authors as a continuation of their earlier work treated with gamma rays of various dosage rates the eggs of the Varo race of Bombyx mori L. of different developmental stages and examined them as well as in the larvae hatched the important biological changes, the period and per cent of the hatching of larvae, the period of larval development, the occurrence of diseases and the further increase, as well as the properties of repeatedly laid eggs. As a result of experiments it was established that eggs irradiated in the various stages of early embryonic development as well as in the last stage of late embryonic development and the larvae hatched from these respectively exhibit properties substantially changed upon the effect of irradiation. Radiation injury occurred in each group at 3000 r emits (Table 1). Malformed larvae developed only from eggs irradiated in the earliest stage of embryonic development (Figs, la, lb, 2. and 3). No diseases of silkworms (polyedrosis, flacherie, muscardine, gattine) occurred in the subgroups irradiated with 200 r while in the groups trated with higher dosage values all kinds of larval diseases were found (Table 3). The per cent of moths emerged from the cocoons diminished with the increased dosage rate but to a lesser degree than in the case of the hatching of larvae. In groups A, В and C among the moths with the increase of gamma irradiation dosage the number of males increased while it diminished in group D irradiated in the late embryonic stage (Table 4). In microscopic examination of the moths of irradiated groups the spores of Nosema bombycis N and of other pathogens were found. Gamma irradiation affords no protection from the pathogens and even reduces the resistance. Finally it has been established that the output of eggs of the moths originating from the larvae of irradiated eggs diminished in the groups A, В and C with the increasing dosage of irradiation while it increased in group D. The weight of the eggs increased proportionally to the higher dosage of irradiation in all groups, without attaining, however, the weight of the controleggs- Breeding material obtained from irradiated Bombyx eggs will be examined in more detail in 1964.

Actions (login required)

Edit Item