[Long time combined action of cadmium and ultraviolet radiation on barley plants].
In a greenhouse experiment the development of biomass and grain yield was studied under a long-time combined action of medium-wave UV-radiation and cadmium (exposure levels of the agents were, respectively, 0.65-1.30 W/m2, 5 and 50 mg/kg of soil). The influence of the metal on the UV-radiation induced inhibition of the vegetative mass development was found to be dependent on the duration of stress: with increase in the exposure time the cadmium ability for cushioning negative effects of irradiation decreases. Simultaneously the contribution of the metal and its interaction with UV-radiation to the variability in the observed indicator (biomass) becomes much less significant than that of irradiation. Considerable independent of cadmium concentration reduction in the grain yield becomes evident at a rate of medium-wave UV-radiation intensity of 0.65 W/m2, whereas at UV-radiation exposure levels of 1.30 W/m2 and the heavy metal concentration of 50 mg/kg in soil practically total inhibition of grain productivity occurred. As for grain formation, relative effects of irradiation were somewhat higher than these of cadmium and its interaction with UV-radiation.
Selezneva
E M
EM
Russian Institute of Agricultural Radiology and Agroecology, Russian Academy of Agricultural Sciences, Obninsk, 249030 Russia. riar@obninsk.org
Ratnikov
A N
AN
Goncharova
L I
LI
Zhigareva
L I
LI
D018533:Biomass; D002104:Cadmium / Q000032:analysis / Q000494:pharmacology*; D004307:Dose-Response Relationship, Radiation; D002523:Edible Grain / Q000254:growth & development; D001467:Hordeum / Q000187:drug effects* / Q000254:growth & development / Q000528:radiation effects*; D012639:Seeds / Q000187:drug effects* / Q000254:growth & development / Q000528:radiation effects*; D012987:Soil / Q000032:analysis; D013997:Time Factors; D014466:Ultraviolet Rays
D012987:Soil; D002104:Cadmium