中国植物学会七十五周年年会：论文摘要汇编（1933-2008）

中国植物学会七十五周年年会即将在兰州召开。五年来，中国植物学的各分支学科都得到了不同程度的发展，为推动植物学科的研究和发展，中国植物学会第十三届理事会决定出版论文摘要汇编。

大会特邀报告
高山冰缘植物响应极端环境的机理研究
高等植物表观遗传调控对基因组稳定性和植物生长发育的影响
早期陆生维管植物的演化和分异
植物分类学面临的新挑战
植物基因流动态、迁地保育的遗传风险及资源发掘利用
中性与近中性群落生态学理论
光合膜复合物功能调控机理

论文摘要
一、系统与进化植物学
二、植物生态与环境生物学
三、植物发育与分子生物学
四、植物资源的可持续利用
五、植物学普及与教学

论文摘要(一、系统与进化植物学)
一、系统与进化植物学Phylogeny and Biogeography of Smilacaceae based on nuclearand chloroplast DNA sequencesChengxin Fu Guanchun Chen Kenneth M．Cameron2(1 LaboratoryofSystematic＆EvolutionaryBotanyandBiodiversity，CollegeofLifeSciences，ZhejiangUniversity，Hangzhou 310058，China2 Department ofBotany，University ofWisconsin，Madison Madison，WI 53706-1381，U S A)Smilacaceae are a cosmopolitan family of liliales characterized by climbing habit，reticulateleaf venation，paired petiolar tendrils，and unisexual flowers Deviations from this generalized morphology have lead to the division of Smilacaceae into at least seven different genera and five sections within the large genus Smilax．In particular,taxa with connate tepals(Heterosmilax)，more than six tamens(Pleiosmilax，Oligosmilax)，or herbaceous habit(Nemexia)have beenvariously classified In this paper,using DNA sequences of 101 taxa from the nuclear rDNA ITSgene region cpDNA matK and rpll6，parsimony and Mrbayes analyses provide moderateresolution．The result shows that phylogenetic relationships of Rhipogonum and Lapageria areclosely related to Smilax，but supports they as separate families Within Smilax the Koyama’ssections are not monophyletic except for Nemexia Three major lineages are evident．The first isthe Old world clade that can be subdivided into two main clades，one including the most species ofsect．China，the most of sect．Macranthae，and some species of sect．Coilanthus，the other cladeincluding the most species of Heterosmilax，the herbaceous Smilax species with a East Asia andNorth American distribution and most species of sect．Coilanthus．In the monophyletic herbaceousclade．the S riparia and S．herbacea complex represents a eastward dispersal from Asia to NorthAmerica．Another New World clade contains woody North America species，South Americaspecies，and the Asian S. sieboldii and American S．hispida complex，which there is evidence ofeastward dispersal from North America to Asia．The third lineage is represented byera．which is the sole member of Smilax section Smilax，widely distributed in North Africa，SouthEurope and South Asia，and is sister to the entire genus in ITS consensus tree，showing a ancestralcharacter．The African S kraussiana is sister to the Australia S Australia．which are both of a verysimilar morphology．The estimated divergence time of Smilacaceae is 21 lmy based on the Bayesian datingmethod，but the ancestor of Smilacaceae have existed around 52my．The results，combined withfossil evidence，suggested that Smialcaceae may be originated in South America and migrated toNorth America finally across the north atlantic land bridge to Europe during the early Eocene，butduring the middle Miocene the north atlantic land bridge was broken.