[The effects of UV-irradiation of barley plants on the morphophysiological parameters and productivity of the offsprings].
In a greenhouse experiment effects have been studied the UV-B-irradiation of barley (intensity of biologically active UV-B-radiation was 0.15, 0.29 and 0.45 W/m2) on the morphophysiologic parameters, productivity and reproductive sphere of offsprings of two succeeding generations. It has been shown that along with a decrease in the specific leaf mass and biomass M1-generation plants exhibited an increase in the stem height and assimilative leaf area. The reduction of grain yield in offsprings of the first post-radiation generation was mainly caused by the reduced size in the reproductive organs and by reduced number of caryopsides in a ear. The observed effects were independent of the UV-B exposure levels to the precursors. The aftereffect of UV-B-irradiation for M2-generation plants shown itself as changes in the specific leaf area, less pronounced compared to the precursors, and reduction in the vegetative mass and grain yield, most significant in offsprings of plants exposed to the maximum UV-B levels. Disturbances in the reproductive sphere appeared as reduction in the size of developing grains. The data derived suggest that long-term effects of UV-B-irradiation are possible not only in the first but also in the second generation of impacted plants.
Selezneva
E M
EM
Goncharova
L I
LI
Tikhonov
V N
VN
D004307:Dose-Response Relationship, Radiation; D001467:Hordeum / Q000033:anatomy & histology / Q000254:growth & development* / Q000528:radiation effects*; D012098:Reproduction / Q000528:radiation effects; D014466:Ultraviolet Rays