川续断目的花粉演化  

Evolution of Pollen in the Dipsacales

作　　者：许腊[1,2] 陆露[1] 李德铢[1] 王红[1] 

机构地区：[1]中科院昆明植物研究所生物多样性与生物地理学重点实验室中国西南野生生物种质资源库,云南昆明650204 [2]中国科学院研究生院,北京100049

出　　处：《植物分类与资源学报》2011年第3期249-259,共11页Plant Diversity

基　　金：国家重点基础研究发展计划973项目(2007CB411603)

摘　　要：以APGIII定义的川续断目(Dipsacales)忍冬科(Caprifoliaceae)和五福花科(Adoxaceae)为研究对象,基于已有的川续断目分子系统树和花粉形态数据,分析了忍冬科25属和五福花科5属的花粉形态多样性,采用简约法(Fitch Parsimony)推测花粉祖征和演化式样,寻找共衍征和分类性状。选择花粉萌发孔数目、萌发孔类型、花粉形状、大小和外壁纹饰五个关键性状推断了其演化式样。研究表明:三孔沟、近球形、较小花粉、网状纹饰是川续断目花粉祖征。长球型、中等和较大花粉,以及刺状纹饰是忍冬科的共衍征,支持忍冬科和科下分支为单系群。忍冬科花粉刺状纹饰和五福花科花粉网状纹饰明显将两个科区分开来。通过追溯性状演化分析,支持将七子花属(Heptacodium)置于忍冬族(Caprifolieae),以及Zabelia置于刺续断科的观点。Following APGIII, the order Dipsacales was divided into the two families, i.e. Caprifoliaceae and Adox- aceae. Based on the molecular phylogenetic tree published by Tank and Donoghue in 2010 and pollen data reported previously, pollen diversity of thirty genera in this order was investigated, which represented twenty-five genera in Caprifoliaceae and five genera in Adoxaceae, respectively. Pollen evolution in the Dipsacales was studied by unordered （Fitch） parsimony. This paper lights on the plesiomorphies, synapomorphies and diagnostic pollen characters presented in this order. Key characters were chosen for inferring evolutionary patterns, which were aperture number, aperture type, shape, size and sculpture. Our results showed that Dipsacales presented distinct evolutionary patterns having plesiomorphies like tri-colporate, subspheroidal, small size and reticulate ornamentation. Presences of syna- pomorphies such as prolate, medium and large size, and echinate have strongly supported the monophyletic position of Caprifoliaceae and its subclades. Under the order, the families Caprifoliaceae and Adoxaceae are readily distin- guished from pollen morphology, i.e. echinate and reticulate ornamentation respectively. Palynologieal data were found to be relatively congruent with recent molecular phylogeny, finally, we supported that Heptocodium should be put into Caprifoliaeeae and Zabelia into Morinaceae.

关 键 词：川续断目 忍冬科 五福花科 分子系统学 花粉形态 性状演化 

分 类 号：Q941[生物学—植物学] Q949