不同品种烤烟对不同时间UV-C胁迫的适应性研究?

左 敏; 周冀衡; 何 伟; 杨虹琦; 杨中义; 柳 立; 刘优雄; 肖志新

doi:10.3969/j.issn.1007-5119.2010.06.004

不同品种烤烟对不同时间UV-C胁迫的适应性研究?

Adaptability of Different Flue-cured Tobacco Varieties to UV-C Stress Duration

摘要

摘要: 为探讨不同烤烟品种对UV-C胁迫的适应性，以6个主栽烤烟品种为材料，在琼脂平板培养条件下采用UV-C辐照时间胁迫处理，测定了不同胁迫时间下各品种幼苗的单株鲜质量、叶片的光合色素含量、根系活力和抗氧化酶活性的变化。结果表明，经UV-C辐照时间胁迫处理，各品种幼苗的单株鲜质量、叶绿素a和b含量随辐照时间的延长而降低，类胡萝卜素含量虽低于对照，却表现出随UV-C辐射时间延长而减幅降低的趋势，叶绿素a/b增加，根系脱氢酶活性和POD活性增加而CAT活性降低，且变化幅度表现出品种间差异性。综合各项指标，6个品种对UV-C胁迫的适应性为云烟85>红大>NC89>K326>中烟98>云烟87。

Abstract: Six popular flue-cured tobacco varieties were cultivated in agar medium under UV-C stress. The growth of the seedlings, the content of photosynthetic pigments, the vigor of root system and the activities of the antioxidant enzymes were determined. The result showed that the fresh weight, the contents of chlorophyll a and chlorophyll b decreased with the treating time prolonged. The content of carotenoid was less than the control group. The rate of reduction decreased with radiation time increased. The ratio of chlorophyll a to chlorophyll b increased. The activities of root dehydrogenase and POD increased while CAT decreased. In conclusion, the descending order of the adaptability to UV-C stress is Yunyan85, Hongda, NC89, K326, Zhongyan98, Yunyan87.

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