Testing complete plastomes and nuclear ribosomal DNA sequences for species identification in a taxonomically difficult bamboo genus Fargesia  

作　　者：Shi-Yu Lv Xia-Ying Ye Zhong-Hu Li Peng-Fei Ma De-Zhu Li 

机构地区：[1]School of Life Science,Northwest University,Xi'an,Shaanxi,710069,China [2]Germplasm Bank of Wild Species,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming,Yunnan,650201,China [3]Agronomy and Life Science Department,Zhaotong University,Zhaotong,Yunnan,657000,China [4]Kunming College of Life Science,University of Chinese Academy of Sciences,Kunming,Yunnan,650201,China

出　　处：《Plant Diversity》2023年第2期147-155,共9页植物多样性（英文版）

基　　金：supported by grants from CAS' Largescale Scientific Facilities (Grant No.2017-LSF-GBOWS-02);the Key R & D Program of Yunnan Province,China (Grant No.20210 3AC100003);Ten Thousand Talent Program of Yunnan Province (Grant No.YNWR-QNBJ-2020-297)。

摘　　要：Fargesia,the largest genus within the temperate bamboo tribe Arundinarieae,has more than 90 species mainly distributed in the mountains of Southwest China.The Fargesia bamboos are important components of the subalpine forest ecosystems that provide food and habitat for many endangered animals,including the giant panda.However,species-level identification of Fargesia is difficult.Moreover,the rapid radiation and slow molecular evolutionary rate of Fargesia pose a significant challenge to using DNA barcoding with standard plant barcodes(rbcL,matK,and ITS) in bamboos.With progress in the sequencing technologies,complete plastid genomes(plastomes) and nuclear ribosomal DNA(nrDNA)sequences have been proposed as organelle barcodes for species identification;however,these have not been tested in bamboos.We collected 196 individuals representing 62 species of Fargesia to comprehensively evaluate the discriminatory power of plastomes and nrDNA sequences compared to standard barcodes.Our analysis indicates that complete plastomes have substantially higher discriminatory power(28.6%) than standard barcodes(5.7%),whereas nrDNA sequences show a moderate improvement(65.4%) compared to ITS(47.2%).We also found that nuclear markers performed better than plastid markers,and ITS alone had higher discriminatory power than complete plastomes.The study also demonstrated that plastomes and nrDNA sequences can contribute to intrageneric phylogenetic resolution in Fargesia.However,neither of these sequences were able to discriminate all the sampled species,and therefore,more nuclear markers need to be identified.

关 键 词：Fargesia Genome-skimming DNA barcoding PLASTOME Ribosomal DNA 

分 类 号：S795.2[农业科学—林木遗传育种]