摘要
通过开展山茶属连蕊茶组(Camellia Sect.Theopsis)和毛蕊茶组(Camellia Sect.Eriandria)的花粉形态研究,为2组植物的系统演化、分类鉴定等提供一定的参考依据。以2组植物的20种(变种)材料为研究对象,进行花粉形态的扫描电镜观察。结果显示:(1)20种连蕊茶组和毛蕊茶组植物主要为中等花粉(25~50μm)和大花粉(50~100μm),花粉极面观为三裂圆形,赤道面观为长球形,萌发孔类型为3孔沟型。(2)花粉的外壁纹饰主要包括孔穴状、疣状和颗粒状3种纹饰类型,长管连蕊茶(C.elongata)为孔穴状纹饰,蒙自连蕊茶(C.forrestii)和尖萼蒙自连蕊茶(C.forrestii var.acutisepala)为疣状纹饰,其余17种(变种)均为颗粒状纹饰。研究推测2组植物花粉外壁纹饰的演化趋势为孔穴状→颗粒状→疣状。花粉的形态特征支持连蕊茶组和毛蕊茶组植物为单系类群的观点,但作孚连蕊茶(C.tsofuii)和荔波连蕊茶(C.lipoensis)作为变种的分类观点有待进一步研究探讨。
To provide references for the phylogenetic evolution,classification and identification of plants in Camellia Sect.Theopsis and Camellia Sect.Eriandria were studied by pollen morphology.20 species of the two sections,pollen shape and exine sculpture were used as materials and observed by scanning electron microscopy(SEM).Results indicated:(1)Pollen size of 20 species mainly belonged to medium(25-50μm)and large(50-100μm)pollen.The pollens were all single-grain pollen with three grooves,three-cracked in the polar view and long spherical in the equatorial view.(2)There were three types of pollen exine sculpture,including foveolate,granulate and verrucate.C.elongata was foveolate type,C.forrestii,and C.forrestii var.acutisepala were verrucate type,and the other 17 species were granulate type.We considered that the evolution trend of pollen exine sculpture of the two sections was foveolate→granulate→verrucate.The results of pollen exine sculpture types supported the view that Sect.Theopsis and Sect.Eriandria were a monophyletic clade,while the taxonomic status of C.tsofuii and C.lipoensis should be further studied.
作者
张亚利
杨耐英
宋垚
李湘鹏
郭卫珍
蔡友铭
ZHANG Yali;YANG Naiying;SONG Yao;LI Xiangpeng;GUO Weizhen;CAI Youming(Forestry&Fruit Tree Research Institute,Shanghai Academy of Agricultural Sciences,Shanghai 201403;Shanghai Normal University,Shanghai 200231;Shanghai Botanical Garden,Shanghai 200231;Hunan Forestry Botanical Garden,Changsha 410116)
出处
《植物研究》
CAS
CSCD
北大核心
2023年第3期470-480,共11页
Bulletin of Botanical Research
基金
上海市花卉产业技术体系建设(2022-2026)
国家自然科学基金青年基金项目(31500578)。
关键词
观赏园艺
连蕊茶组
毛蕊茶组
花粉
ornamental plants
Camellia Sect.Theopsis
Camellia Sect.Eriandria
pollen
