J Integr Plant Biol. ›› 2003, Vol. 45 ›› Issue (5): 601-607.

• Research Articles •

### Comparative Studies on the Fine Structure and Elemental Composition of Envelopes of Trachelomonas and Strombomonas (Euglenophyta)

WANG Quan-Xi, LIU Hong-Jia, YU Jing, SUN Shi-Qin, ZHANG Da-Wei, BAO Wen-Mei

• Published:2003-05-15

Abstract:

Fine structure and elemental composition of envelopes of 10 taxa of Trachelomonas and Strombomonas from natural freshwater bodies in China were studied and phylogeny of both genera were discussed. The results indicate that iron (Fe) and silicon (Si) are the primary mineral elements of the envelopes. Composition of mineral elements was uncorrelated with envelope color, however, it was highly correlated with the microarchitecture of the envelopes. Content of Si was higher than that of Fe in all species of Strombomonas and some species of Trachelomonas with rough surface. In most species ofTrachelomonas, especially those with dense and smoothy surface, content of Fe was higher than that of Si. Based on the above results, we propose to assign those species of Strombomonas into Trachelomonas and consider them as a group of the latter. These species were the most primitive among the group with envelopes in Euglenaceae.

（1.上海师范大学生物系，上海200234;  浙江大学生命科学学院，杭州310029；
3.  哈尔滨师范大学生物系，哈尔滨150080）

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