摘要： 以大白菜随体单体、三体和二倍体为试材，在自然条件下，对营养生长时期功能叶的净光合速率、光合速率日变化、光饱和点、光补偿点、叶绿素含量、希尔反应活性等生理生化指标进行了测定，结果表明：随体染色体的附加对大白菜光合速率具有明显的负效应，而缺失一条随体染色体对光合速率的影响不大；随体染色体的缺失或附加对大白菜光合速率日变化趋势影响不大，三者的光合速率日变化均呈典型的双峰曲线；却缩短了大白菜的光合有效时间，不利于光合产物的积累。随体染色体的缺失或附加对叶绿素含量有正效应，随体单体、三体的叶绿素含量明显高于二倍体；随体染色体的缺失对营养生长时期希尔反应活性影响不大，而附加一条随体染色体则使随体三体的希尔反应活性大大降低。

关键词: 大白菜, 随体染色体, 单体, 三体, 光合作用

Abstract: In order to research the effect of additioning or dropping of satellite chromosome on the photosynthetic char-acteristics of Chinese cabbage,the satellite chromosome monosome(sat monosome),diploid and trisome(sat trisome)of Chi-nese cabbage were used to examine photosynthetic rate(Pn),diurnal variation,light saturation and compensation point,the chlorophyll content and Hill reaction activity etc.The result showed that the additioning of sat-chromosome had a negative effect on the Pn and the dropping of sat-chromosome had no effect on Pn.The additioning or dropping of sat chromosome had no effect on diurnal variation,the curves of diurnal change of Pn of three lines were similar,all showed typical two peaks.The additioning or dropping of sat-chromosome shortened optimal time of photosynthesis.The additioning or dropping of sat-chromosome had a positive effect on chlorophyll content.The additioning of sat-chromosome reduced Hill reaction activity greatly,but the dropping of satellite chromosome had no effect on it.

Key words: Chinese cabbage, Satellite chromosome, Monosome, Trisome, Photosynthesis

中图分类号: 

• S634.1