Understanding how natural hybridization and polyploidizations originate in plants requires identifying potential diploid ancestors.However,cryptic plant species are widespread,particularly in Ceratopteris(Pteridaceae)...Understanding how natural hybridization and polyploidizations originate in plants requires identifying potential diploid ancestors.However,cryptic plant species are widespread,particularly in Ceratopteris(Pteridaceae).Identifying Ceratopteris cryptic species with different polyploidy levels is a challenge because Ceratopteris spp.exhibit high degrees of phenotypic plasticity.Here,two new cryptic species of Ceratopteris,Ceratopteris chunii and Ceratopteris chingii,are described and illustrated.Phylogenetic analyses reveal that each of the new species form a well-supported clade.C.chunii and C.chingii are similar to Ceratopteris gaudichaudii var.vulgaris and C.pteridoides,respectively,but distinct from their relatives in the stipe,basal pinna of the sterile leaf or subelliptic shape of the fertile leaf,as well as the spore surface.In addition,chromosome studies indicate that C.chunii and C.chingii are both diploid.These findings will help us further understand the origin of Ceratopteris polyploids in Asia.展开更多
Paraphlomis is a genus of Lamiaceae with about 30 species distributed mainly in subtropical China.In this study,we carried out the first molecular phylogenetic analyses to elucidate the relationships within the genus ...Paraphlomis is a genus of Lamiaceae with about 30 species distributed mainly in subtropical China.In this study,we carried out the first molecular phylogenetic analyses to elucidate the relationships within the genus based on two nuclear and four plastid DNA regions.Our results,which recovered a species of Matsumurella within Paraphlomis,indicate that the genus is not monophyletic.The two sections and most of the series previously described within the genus are also shown to be polyphyletic.Combining with morphological evidence,our study indicates that nutlet morphology rather than calyx morphology is of phylogenetic value for the infrageneric classification of Paraphlomis.Moreover,P.jiangyongensis,a new species from southern China,is here described,and P.coronata,formerly treated as a variety of P.javanica,is here resurrected as a distinct species within the genus.展开更多
基金funded by the Biodiversity Survey and Assessment Project of the Ministry of Ecology and Environment,China(2019HJ2096001006)the Shanghai Municipal Administration of Forestation and City Appearance(grant number G192421)+2 种基金the Biological Resource ProgrammeCAS(ZSZY-001-8)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA13020603)the Basic Project of Ministry of Science and Technology of China under Grant(2015FY110200).
文摘Understanding how natural hybridization and polyploidizations originate in plants requires identifying potential diploid ancestors.However,cryptic plant species are widespread,particularly in Ceratopteris(Pteridaceae).Identifying Ceratopteris cryptic species with different polyploidy levels is a challenge because Ceratopteris spp.exhibit high degrees of phenotypic plasticity.Here,two new cryptic species of Ceratopteris,Ceratopteris chunii and Ceratopteris chingii,are described and illustrated.Phylogenetic analyses reveal that each of the new species form a well-supported clade.C.chunii and C.chingii are similar to Ceratopteris gaudichaudii var.vulgaris and C.pteridoides,respectively,but distinct from their relatives in the stipe,basal pinna of the sterile leaf or subelliptic shape of the fertile leaf,as well as the spore surface.In addition,chromosome studies indicate that C.chunii and C.chingii are both diploid.These findings will help us further understand the origin of Ceratopteris polyploids in Asia.
基金This work was supported by the National Natural Science Foundation of China(Grant No.31872648)the Yunnan Fundamental Research Projects(Grant No.2019FI009)+1 种基金the“Ten Thousand Talents Program of Yunnan”(Grant No.YNWRQNBJ-2018-279)CLX,the CAS“Light of West China”program to CLX and YPC,and the“Special Investigation on Wild Orchidaceae Plant Resources in Hunan Province”program(Grant No.2020070711)to XLY.
文摘Paraphlomis is a genus of Lamiaceae with about 30 species distributed mainly in subtropical China.In this study,we carried out the first molecular phylogenetic analyses to elucidate the relationships within the genus based on two nuclear and four plastid DNA regions.Our results,which recovered a species of Matsumurella within Paraphlomis,indicate that the genus is not monophyletic.The two sections and most of the series previously described within the genus are also shown to be polyphyletic.Combining with morphological evidence,our study indicates that nutlet morphology rather than calyx morphology is of phylogenetic value for the infrageneric classification of Paraphlomis.Moreover,P.jiangyongensis,a new species from southern China,is here described,and P.coronata,formerly treated as a variety of P.javanica,is here resurrected as a distinct species within the genus.
