Abstract: In order to research the effect of additioning or dropping of satellite chromosome on the photosynthetic characteristics of Chinese cabbage, the satellite chromosome monosome(satmonosome), diploid and trisome(sattrisome) of Chinese cabbage were used to examine the chlorophyll content,Hill reaction activity, photosynthetic rate(Pn),diurnal variation and Rubisco activity etc.The result showed that the additioning or dropping of satchromosome had a positive effect on chlorophyll content and a negative effect on chl.a/b. The additioning or dropping of satchromosome had a negtive effect on the photosynthetic rate(Pn). The curves of diurnal change of Pn of trisome and diploid were similar, all showed typical two peaks and showed conspicuous ‘noon sleep’. The decline of Hill reaction activity and Rubisco activity were the direct factors resulting in low photosynthetic rate of satmonosome and sattrisome. The results helped to realize the function of satchromosome of Chinese cabbage and highphotosynthetic efficiency breeding using the chromosome engineering.

Key words: Chinese cabbage, Chromosome, Chromosome addition, Monosome, Trisome, Photosynthesis, Chromosomal engineering