[Growth of Arabidopsis thaliana embryos following irradiation of the plants during the generative phase].

The flowers and young legumes of Arabidopsis thaliana (phases of development B3--B7) were irradiated by gamma-rays at the dose of 4 kr. The irradiation did not influence the duration of phases of the flower development irrespective of the phase of irradiation. The cytological characteristics of embryos is given for each phase under study. The duration of developmental stages (from zygote till the spheroid stage) in the control and following the irradiation was practically the same. The irradiation induced different developmental abnormalities. The most frequent type: the first transversal division of the apical cell instead of the longitudinal one. The irregular division of the suspensor cells, delay in the apical cell division upon the normal suspensor division, irregular position of septa and irregular form of the embryonic body were also observed. The highest level of abnormalities in the formation of cotyledons was noted following the irradiation of young legumes (phases B6--B7).