[en] Vitamin C is a nutrient component in fruits and vegetables, it's also an important bioactive substance in human body, and there are also many factors that affect the contents of vitamin C in fruits and vegetables. There papers reported that ⁶⁰Co γ-rays irradiation has effects on vitamin C in fruits and vegetables, but the effect degree has some differences. Some reports says the contents of vitamin C in fruits and vegetables could be significantly reduced by irradiation, while some literatures reported that irradiation at low doses had no significant effect. The content of vitamin C in fruits and vegetables could be influenced by various factors, such as ascorbic oxidative enzyme, chemical composition, irradiation dose, irradiation environment, physiological metabolism of fruits and vegetables, etc. Irradiation treatment is an important preservation technique of fruits and vegetables. Though there were some effects of irradiation on vitamin C of fruits and vegetables, it would not influence the applications of irradiation technology in the fruit and vegetable storage, because the effects of irradiation on vitamin C could be avoided or minimized through appropriate technical treatment. This paper tries systematically analyses and summarizes the results of related investigation and provides a helpful reference in scientific applications of irradiation technology on fruits and vegetables preservation. (authors)

[en] The current status of space mutation breeding research in aboard was briefly introduced, the application of space mutation breeding and inheritance in specially good germplasm material in Henan province were well summarized and analysis of status and problems and perspectives of application of space technology for crop improvement. The space mutagenesis will provided a new way for the future breeding. (authors)