Mummified Magnoliaceae woods from the upper Oligocene of South China,with biogeography,paleoecology,and wood trait evolution implications  

作　　者：Lu-Liang Huang Jian-Hua Jin Cheng Quan A.lexei AOskolski 

机构地区：[1]State Key Laboratory of Biocontrol,Guangdong Provincial Key Laboratory of Plant Resources,and School of Life Sciences,Sun Yat-sen University,Guangzhou 510275,China [2]State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China [3]School of Earth Science and Resources,Chang’an University,Xi’an 710054,China [4]Department of Botany and Plant Biotechnology,University of Johannesburg,Johannesburg 2006,South Africa [5]Komarov Botanical Institute of the Russian Academy of Sciences,St.Petersburg 197376,Russia

出　　处：《Journal of Systematics and Evolution》2020年第1期89-100,共12页植物分类学报（英文版）

基　　金：This study was supported by the National Natural Science Foundation of China(Grant Nos.41820104002,41772009,and 41661134049);the Russian Foundation for Basic research(Grant No.16-04-00725);the National Research Foundation of South Africa(Incentive Grant No.109531);State Key Laboratory of Palaeobiology and Stratigraphy(Nanjing Institute of Geology and Palaeontology,CAS)(No.173101);Guangdong Provincial Key Laboratory of Plant Resources(No.PlantKF04),and the Scientific Research Fund;Hongda Zhang,Sun Yat-sen University.We thank the University of Johannesburg and the Komarov Botanical Institute(institutional research Project No.AAAA-A18-118030690081-1)for financial support for A.A.O.We thank graduate students majoring in plant science at Sun Yat-sen University for participating in the field collection of the fossils.

摘　　要：In this paper,we describe a new species Magnolia nanningensis sp.nov.,based on exceptionally well‐preserved mummified fossil woods from the late Oligocene of the Nanning Basin,Guangxi,South China.The features of these woods indicate a close affinity to the section Michelia of the subgenus Yulania belonging to the genus Magnolia sensu lato(Magnoliaceae).Magnolia nanningensis is the first fossil record of the section Michelia from China,the modern diversity center of this group.These mummified woods provide fossil evidence supporting molecular dating that estimated an Oligocene age for divergence of the tropical evergreen section Michelia and the temperate deciduous section Yulania.Helical thickenings on vessel walls and a high degree of vessel grouping found in these fossil woods could be adaptive to temporary,possibly seasonal,droughts and,as suggested by other woods from the Nanning Basin,could be indicative of a monsoon‐influenced tropical climate in Guangxi during the late Oligocene.Helical thickenings have not been reported in magnoliaceous fossil woods prior to the Oligocene.The appearance of this trait was presumably a response to abrupt climate cooling near the Eocene–Oligocene boundary,followed by increase in climate seasonality.The associated increase of latitudinal zonation might be a possible trigger for divergence between the tropical evergreen sect.Michelia and the temperate deciduous sect.Yulania.

关 键 词：evolution late OLIGOCENE MAGNOLIACEAE mummified WOOD PALAEOECOLOGY South China 

分 类 号：Q94[生物学—植物学]