A study of evolution of plants in South Pacific islands

本研究的目的是为了更好地了解生长在南太平洋岛屿上的植物物种的进化和繁殖机制。我们的产出如下1.我们首次对毛足类进行了胚胎学研究，代表了被子植物进化的第一支，这是新喀里多尼亚特有的物种。与已知的代表Amborella旁边分支的睡莲科和Illiciales的信息相比，胚胎学特征的符号学特征得到了澄清。(Tobe et al.2000).我们首次对毛足类Amborella进行了核型分析。2n=26，x=13。在分析的基础上，我们讨论了Amborella的染色体数目可能来源于x=14，被子植物的原始染色体数目可能是x=7。2000).3.分布于包括南太平洋小岛(Isla…)在内的新旧热带地区的劳拉目昆虫胚胎学研究综述在文献调查的基础上提出了更多的NDS。此外，结合Laurales的分子树，我们试图讨论胚胎学性状的进化，同时阐明哪些植物类群和哪些胚胎学性状需要研究。(Kimoto和Tobe，2001)。首次利用rbcL和matK的叶绿体DNA序列对分布于南太平洋岛屿(和澳大利亚)的木麻黄科植物进行了系统发育研究。结果显示出类似于(Gynmostoma(Ceuthostoma(Allocasuarina Casuarina)的关系。(Sogo等人)2001年)。首次对生长在日本伊里奥莫特岛红树林中的8属8种植物的花香进行了分析。我们发现了61种化合物，并讨论了与授粉者的关系。(Azuma等人)2002年)。首次对台湾海棠属14种植物的体细胞染色体进行了核型分析。根据结果，我们讨论了它们的进化，并澄清了台湾存在的5个新种。(Ogiuma和Peng，2002)。较少

The purpose of the present study is to contribute to better understanding of evolution and reproductive mechanisms of plant species growing in South Pacific islands. Our output is as follows.1. We presented the first embryological study of Amborella trichopoda representing the first branch of angiosperm evolution, which is an endemic species in New Caledonia. Compared to already known information on Nymphaeales and Illiciales which represent branches next to Amborella, symplesiomorphies of embryological characters were clarified. (Tobe et al. 2000).2. We presented the first karyotype analysis in Amborella trichopoda. It has 2n=26 with x=13. Based on analyses, we discussed that the chromosome number of Amborella is likely to have been derived from x=14 and that a primitive chromosome number of angiosperms is likely to be x=7. (Oginuma et al. 2000).3. A review of embryological studies on Laurales which are distributed worldwide in tropics of Old and New World including South Pacific isla … More nds was presented on the basis of a literature survey. In addition, in the light of molecular trees available for the Laurales, we tried to discuss an evolution of embryological characters, and simultaneously clarified what plant groups and what embryological characters need investigations. (Kimoto and Tobe 2001).4. An overall phylogenetic study of Casuarinaceae that are distributed in South Pacific islands (and Australia) was conducted for the first time using chloroplast DNA sequences of rbcL and matK. Results showed relationships like (Gynmostoma (Ceuthostoma (Allocasuarina Casuarina))). (Sogo et al. 2001).5. We analyzed floral scent in 8 species of 8 genera growing hi mangrove of Iriomote islands, Japan for the first time. We found 61 chemical compounds and discussed relationships with polinators. (Azuma et al. 2002).6. Fourteen species of Begonia from Taiwan were analyzed with respect to karyotypes of their somatic chromosomes for the first time. Based on results, we discussed their evolution, and clarified that 5 new species exist in Taiwan. (Oginuma and Peng 2002). Less