Reduction of gramine concentration by gamma-irradiation in seedlings of Hordeum vulgare var. Amaginijo
1994
Sato, M. | Hiraoka, A.
The effects of gamma-irradiation on gramine concentration in seedlings of barley (Hordeum vulgare var. Amaginijo) were investigated. Similarly to other barley cultivars, this amine appeared in shoots of sprouting seedlings and its concentration increased in the course of subsequent development to attain a maximum around the ninth day. Exposure of two-day-old seedlings to gamma-radiation resulted in significant reductions of the concentration as compared with non-irradiated control, dependent upon the radiation dose, whilst the five-day-old seedlings were slightly affected. Seeds were more radioresistant than younger seedlings, when the decline in gramine quantity was taken as a marker of radiation effect. Longer storage of irradiated seeds enhanced the decrease of this compound in seedlings. At relatively low doses, gramine concentration was successively recovered to reach the control level during further growth. This decline of gramine content could not be correlated solely with water content of seeds and oxygen did not seem to be a critical factor. On the basis of these results, probable mechanisms for radiation-induced reduction of the amine concentration are discussed. In these experiments it was found that changing patterns of gramine content were in close parallel with those of growth.
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