Search

Schoenoplectus tabernaemontani (C. C. Gmelin) Palla is a typical macrophyte in diverse wetland ecosystems. This species holds great potential in decontamination applications and carbon sequestration. Previous studies have shown that this species may have experienced recent polyploidization. This would make S. tabernaemontani a unique model to study the processes and consequences of whole-genome duplications in the context of the well-documented holocentric chromosomes and dysploidy events in Cyperaceae. However, the inference was not completely solid because it lacked homology information that is essential to ascertain polyploidy. We present here the first chromosome-level genome assembly for S. tabernaemontani. By combining Oxford Nanopore Technologies (ONT) long reads and Illumina short reads, plus chromatin conformation via the Hi-C method, we assembled a genome spanning 507.96 Mb, with 99.43% of Hi-C data accurately mapped to the assembly. The assembly contig N50 value was 3.62 Mb. The overall BUSCO score was 94.40%. About 68.94% of the genome was comprised of repetitive elements. A total of 36,994 protein-coding genes were predicted and annotated. Long terminal repeat retrotransposons accounted for ∼26.99% of the genome, surpassing the content observed in most sequenced Cyperid genomes. Our well-supported haploid assembly comprised 21 pseudochromosomes, each harboring putative holocentric centromeres. Our findings corroborated a karyotype of 2 n = 2 X = 42. We also confirmed a recent whole-genome duplication occurring after the divergence between Schoenoplecteae and Bolboschoeneae. Our genome assembly expands the scope of sequenced genomes within the Cyperaceae family, encompassing the fifth genus. It also provides research resources on Cyperid evolution and wetland conservation. [ABSTRACT FROM AUTHOR]

Objective: To analyse a special kind of Schisandra chinensis with the white fruit using ITS2 barcode at molecular levels., Method: ITS2 regions were sequenced bidirectionally. Sequence assembly and consensus sequence generation were performed using the CodonCode Aligner, MEGA 5.0 software was used to align the sequences. The ITS2 secondary structure was predicted using ITS2 web server, BLAST 1 method was used to identify the S. chinensis with the white fruit., Result: The length of the ITS2 sequence was 231 bp. And the sample was identified as S. chinensis using the method of BLAST 1. Their mean interspecific genetic distance (K2P distance) among the populations of the S. chinensis with the white fruit and S. chinensis was far lower than the mean interspecific genetic distance between the S. chinensis and S. sphenanthera., Conclusion: By using ITS2 the S. chinensis with the white fruit was identified as S. chinensis, and the ITS2 barcode could be used to identify S. chinensis and S. sphenanthera.

Objective: The characters of Schisandra chinensis with white fruit were represented at molecular levels and the genetic diversity were investigated using RAPD and ISSR., Methods: 12 primers of RAPD randomized markers and 8 primers of ISSR markers were used to test 21 samples of white fruit Schisandra chinensis, and POPGENE 32 software were used to analyze the results., Results: One or more unique bands were produced to distinguish white fruit Schisandra chinensis from normal Schisandra chinensis using the primers of S83, S180 and S300. RAPD:66 discernible DNA fragments were generated with 52 (78.79%) polymorphic fragments; ISSR: 42 discernible DNA fragments were generated with 25 (59.52%) polymorphic fragments. The genetic variation of white fruit Schisandra chinensis was more unstable than normal Schisandra chinensis, but the genetic distance of them was small at the species level., Conclusion: RAPD and ISSR markers can be used to put up the characteristics of Schisandra chinensis with white fruit at molecular levels. Also they can indicate the genetic relationship of the Schisandra chinensis germplasm resource.

Objective: To establish an effective and convenient method for HPLC fingerprints of Xuezhiling tablets and new Xuezhiling tablets, and to observe the changes of fingerprint with crude and processed Cassiae Semen in Xuezhiling tablets., Methods: The HPLC with Agilent TC-C18 (4.6 mm x 250 mm, 5 microm) column was used for the gradient elution of acetonitrile-0.1% phosphoric acid solution, at the flow rate of 1.0 mL/min. Detection wavelength was set at 284 nm and the column temperature was 30 degrees C., Results: Ten batches of Xuezhiling tablets and new Xuezhiling tablets were tested and gained HPLC fingerprint containing 20 common peaks, respectively., Conclusion: This method is stable and reliable. The number of common peaks of fingerprint had little change after the crude and processed Cassiae Semen in Xuezhiling tablets interchangeably, but the contents of some components had significant changes.