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Germplasm Bank of Wild Species
LI Dezhu's Group
YANG Yongping's Group
HU Xiangyang's Group
LI Weiqi's Group
GAO Lizhi's Group
YI Tingshuang's Group
GUO Zhenhua's Group
Jeff Bennetzen's Group
ZHANG Chengjun's Group
Location: Home > Germplasm Bank of Wild Species > YI Tingshuang's Group > Major Research Achievements
Major Research Achievements

1 Molecular Phylogenetics and Evolution of Plant Taxa in Northern Hemisphere

Biogeography of Angiosperm in the Northern Hemisphere is characterized by disjunct distribution of closely related species. A lot of questions have not fully resolved:1) Why does eastern Asia harbor higher species diversity than that of North America? Is it due to a higher speciation rate or low extinct rate? 2) How do disjunct clades diverge in different habitats and climatic zones? 3) Do ferns have similar disjunction pattern and diversification history as seed plants? Applying molecular phylogenetic and biogeographic methods, we have addressed the disjunct pattern of Hamamelis, Osmorhiza, Pistacia, Rhus, Cotinus, Oplopanax, Dendropanax. In next few years, we will carry out the molecular phylogeny and biogeography of Liquidambar, Aralia, Panax, Magnolia, Liriodendron, Mimulus, tribe Kerrieae (Rosaceae), Elaeagnaceae. At same time, we will carry out comparative phylogeographic studies on the eastern Asian – North American groups of Calocedrus (Cupressaceae), Aralia sect. Aralia (Araliaceae), and Zizania (Poaceae). Explore ecological niche modeling to estimate the climatic niches of species within the Adiantum pedatum complex (Pteridaceae) of ferns, Aralia sect. Aralia and Rhus (Anacardiaceae).

2 Reconstruct Tree of Life of Pentapetalae and Rosales

More than 90% of eudicots species diversity is found within the clade Pentapetalae, which includes major clades such as Rosidae, Caryophyllales, Saxifragales, Asteridae, and Santalales, as well as smaller lineages such as Berberidopsidales and Dilleniaceae. Phylogenomic analysis of 83 plastid genes failed to resolve some phylogenetic relationships, e.g. the phylogenetic position of Dilleniaceae. My group will apply 200 single and low-copy nuclear genes to fully resolve the relationships within this clade. My group is also working on the phylogenetic reconstruction of Rosales and families within this order.

3 Domestication of Chinese crops and conservation of genetic diversification

China is one of main crop domestication centers in the world. Important food crops such as rice (Oryza), soybeans (Glycine), millet (Panicum, Steria), orange (Citrus), peach (Prunus), apricot (Prunus), plum (Prunus) have been domesticated in China. However, the domestication history is not clear for most Chinese domesticated crops. Using soybean, foxtail millet and rose as models, my group use AFLP, ISSRs, SSRs and sequences data to address the following questions: 1) Geographic origin of these crops. When, where, and how many times were specific crop species domesticated? What are their wild progenitors? 2) Impacts of human selection on these crops; 3) Biodiversity of crops and its wild progenitor, and conservation of genetic biodiversity.

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