Systematic Studies On Partial Genera And Species Of Brassicaceae From China

The Brassicaceae, which includes model species and has great economic value, is a large family of about 338 genera and 3709 species distributed worldwide (Al-Shehbaz, 2006). There are 102 genera and 412 species in China (Zhou Tai-yien, et al., 2001). Brassicaceae is always recognized a rather homogeneous group based on the characters of six stamens in a teradynamous pattern (two short and four long), cruciform corolla, distinct capsular fruit,and pungency. Although a lot of work has been doing about the classification of infrafamily, none of systems is agreed by almost researchers. The main problems lie on tribal classification, delimitation of genera and placement of some species.The basis of this paper comes from the great task of Natural Science Foundation of Shandong Province: The study on the genetic relationship and systematic placement of two model plants- Arabidopsis thaliana and Thellungiella salsuginea, as well as relative genera and species. Based on the task, we expand and carry out the comprehensive research on the problematic genera and species of Brassicaceae from China as many as possible. The concrete work include: First, we consult a lot of herbarium specimen from PE, NAS, IFP and XJA etc.; Second, we collect more than 100 species of Brassicaceae from Xinjiang, Jilin and Shandong; Third, we study the phylogeny of Brassicaceae from China to approach some divergence on the tribe, genera and species of Brassicaceae using many ways including morphology, micromorphology and molecular systematics, furthermore, estimate the significance of every index. The main results are as follows:1. The micromorphology results confirm that Brassicaceae is a natural group: The leaf epidermis and fruit epidermis have anisocytic stoma; The pollen morphology have reticulate ornamentation; The general ornamentation of the seed coat is reticulate.2. To present new ideas and opinions about the systematic problems of some tribes, genera and species of Brassicaceae, they are as follows:(1) The most of tribes of Brassicaceae from China including Lepidieae,...