ENHANCEMENT OF RADIATION DAMAGE IN GERMINATING WHEAT SEEDS BY HYPERTHERMIA

Guo Fangqing; Gu Ruiqi

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ENHANCEMENT OF RADIATION DAMAGE IN GERMINATING WHEAT SEEDS BY HYPERTHERMIA

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- ENHANCEMENT OF RADIATION DAMAGE IN GERMINATING WHEAT SEEDS BY HYPERTHERMIA
- Journal of Radiation Research and Radiation Processing Vol. 12, Issue 3, Pages: 140-145(1994)
- 作者机构：
  
  1.中国科学院上海植物生理研究所，上海　200032
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Guo Fangqing, Gu Ruiqi. ENHANCEMENT OF RADIATION DAMAGE IN GERMINATING WHEAT SEEDS BY HYPERTHERMIA. [J]. Journal of Radiation Research and Radiation Processing 12(3):140-145(1994)
DOI：

Guo Fangqing, Gu Ruiqi. ENHANCEMENT OF RADIATION DAMAGE IN GERMINATING WHEAT SEEDS BY HYPERTHERMIA. [J]. Journal of Radiation Research and Radiation Processing 12(3):140-145(1994) DOI：

摘要

研究了热对X射线引起的小麦萌发种子辐射损伤的影响。实验表明，热能增强辐射损伤，产生辐射热敏化效应。照射后热处理（41℃或44℃，20 min）显著增强辐射引起的生长抑制，并导致根尖细胞中微核细胞率显著增加。在4.30—8.60 Gy的剂量范围内，热处理增强辐射损伤的效果最显著。辐射热敏化效果取决于热处理在照射前后施加的顺序，其中照射后热处理辐射损伤的增强效果显著高于照射前热处理。小麦萌发种子照射后短时间内（15 min）对热处理敏感，随时间延长，敏感性降低。照射间歇期内进行热处理能够抑制大部分的分次照射效应。根据以上结果，认为热对辐射损伤的增强效应是由于热抑制了辐射损伤修复的缘故，这和动物细胞的实验结果是一致的。

Abstract

Enhancement of X-ray induced radiation damage in germinating wheat seeds by heat treatment (44℃ or 41℃, 20 min) has been investigated. The enhancement effect of heat treatment after irradiation was more significant than that of heat treatment before irradiation at dose range of 4.3-8.6 Gy. It was observed that germinating wheat seeds were very sensitive to heat treatment within 15 min after irradiation, which indicated that the repair of radiation damage was very active and rapid in a short period after irradiation. The repair of radiation damage in interval of fractionated irradiation was severely inhibited by heat treatment. The sensitivity of seeds to heat treatment corresponded with the levels of their repair activities. The more active the repairs of the seeds are, the more sensitive to heat treatment the seeds show. It was assumed that the enhancement of radiation damage by heat treatment in germinating wheat seeds was attributed to the inhibition of radiation damage repair by heat treatment, which is similar to the results of animal experiments.

关键词

辐射热敏化X射线微核分次照射小麦

Keywords

HyperthermiaX-rayMicronucleiFractionated irradiationWheat

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