A study of molecular evolution and reproductive structure in primitive angiosperms

本研究的目的是为更好地了解原始被子植物的分子进化和生殖结构做出贡献。主要研究结果如下：1.对樟科樟木目（Laurales），特别是樟科的铁木属（Eusideroxylon），Monimioiaceae和Hemandiaceae的低级monimioids（Monimioideae和Hortonioideae），以及菖蒲科（Acoraceae）和油桐科（Petrosaviaceae）等单子叶植物的胚胎学进行了研究。此外，我们还研究了壳斗目尤其是桦木科、杨梅科和壳斗科以及杜仲科的花粉管生长方式。2.我们研究了金雀花目杨柳科和单子叶植物岩芹科的分子遗传学。3.根据叶绿体DNA序列研究了整个单子叶植物群和广义Ruscaceae铃兰族的分子系统发育; 4.根据亲缘关系框架讨论了樟科的染色体进化。我们提出了Monimiaceae的2n=38是由2n= 40.5的非整倍体减少而来的假说。我们报道了Strasburgeriabusta的染色体数目为2n=500。这是被子植物中数量最多的。

The purpose of our research is to contribute to better understanding of molecular evolution and reproductive structures of primitive angiosperms. Our output was as follows.1.We studied embryology of Laurales, in particular Eusideroxylon of Lauraceae, lower monimioids (Monimioideae and Hortonioideae) of Monimioiaceae, Hemandiaceae, as well as of basal monocots including Acoraceae and Petrosaviaceae. In addition, we also studied mode of pollen-tube growth in Fagales, in particular Betulaceae, Myricaceae and Fagaceae as well as in Eucommiacea of Garryales.2.We studied molecular phylogeny of Salicaceae of Malpighiales as well as of Petrosaviaceae of basal monocots. In the former study, we discussed a circumscription of the family in addition to internal relationships.3.We also studied molecular phylogeny of the whole monocot group and of Convallarieae of Ruscaceae sensu lato based on chloroplast DNA sequences.4.We discussed chromosome evolution in Laurales in the light of a framework of relationships. We provided the hypothesis that 2n=38 of Monimiaceae was derived by aneuploid reduction from 2n=40.5.We reported chromosome number of Strasburgeria robusta, the only species of Strasburgeriaceae endemic to New Caledonia, to be 2n=500. This is the highest number in angiosperms.