Gamma-irradiation activates biochemical systems: induction of nitrate reductase activity in plant callus.

AUTOR(ES)

Pandey, K N

RESUMO

Gamma-irradiation induced high levels of nitrate reductase activity (NADH:nitrate oxidoreductase, EC 1.6.6.1) in callus of Haworthia mirabilis Haworth. Subcultures of gamma-irradiated tissues showed autonomous growth on minimal medium. We were able to mimic the effects of gamma-irradiation by inducing nitrate reductase activity in unirradiated callus with exogenous auxin and kinetin. These results revealed that induction of nitrate reductase activity by gamma-irradiation is mediated through in vitro activation of hormone synthesis in callus cells.

Documentos Relacionados

• Genetic Effects of Gamma-Irradiation on Egg Production and Adult Emergence of Drosophila Melanogaster
• Potassium-channel activation in response to low doses of gamma-irradiation involves reactive oxygen intermediates in nonexcitatory cells.
• Influence of gamma-irradiation and heating in the presence of a bactericide on the inactivation of Bacillus subtilis spores.
• Accumulation of wild-type p53 protein upon gamma-irradiation induces a G2 arrest-dependent immunoglobulin kappa light chain gene expression.
• Increased levels of E2F-1-dependent DNA binding activity after UV- or gamma-irradiation.