Department of Life Science, Gachon University, Seongnam, Gyeonggi-do 461-701, Republic of Korea.
Gene. 2013 Nov 10;530(2):229-35. doi: 10.1016/j.gene.2013.07.100. Epub 2013 Aug 23.
The sequence of the chloroplast genome, which is inherited maternally, contains useful information for many scientific fields such as plant systematics, biogeography and biotechnology because its characteristics are highly conserved among species. There is an increase in chloroplast genomes of angiosperms that have been sequenced in recent years. In this study, the nucleotide sequence of the chloroplast genome (cpDNA) of Veratrum patulum Loes. (Melanthiaceae, Liliales) was analyzed completely. The circular double-stranded DNA of 153,699 bp consists of two inverted repeat (IR) regions of 26,360 bp each, a large single copy of 83,372 bp, and a small single copy of 17,607 bp. This plastome contains 81 protein-coding genes, 30 distinct tRNA and four genes of rRNA. In addition, there are six hypothetical coding regions (ycf1, ycf2, ycf3, ycf4, ycf15 and ycf68) and two open reading frames (ORF42 and ORF56), which are also found in the chloroplast genomes of the other species. The gene orders and gene contents of the V. patulum plastid genome are similar to that of Smilax china, Lilium longiflorum and Alstroemeria aurea, members of the Smilacaceae, Liliaceae and Alstroemeriaceae (Liliales), respectively. However, the loss rps16 exon 2 in V. patulum results in the difference in the large single copy regions in comparison with other species. The base substitution rate is quite similar among genes of these species. Additionally, the base substitution rate of inverted repeat region was smaller than that of single copy regions in all observed species of Liliales. The IR regions were expanded to trnH_GUG in V. patulum, a part of rps19 in L. longiflorum and A. aurea, and whole sequence of rps19 in S. china. Furthermore, the IGS lengths of rbcL-accD-psaI region were variable among Liliales species, suggesting that this region might be a hotspot of indel events and the informative site for phylogenetic studies in Liliales. In general, the whole chloroplast genome of V. patulum, a potential medicinal plant, will contribute to research on the genetic applications of this genus.
叶绿体基因组的序列是通过母系遗传的,它包含了许多科学领域的有用信息,如植物系统学、生物地理学和生物技术,因为其特征在物种间高度保守。近年来,已测序的被子植物的叶绿体基因组(cpDNA)数量有所增加。在这项研究中,我们完全分析了藜芦属(百合科,百合目)植物Veratrum patulum Loes. 的叶绿体基因组(cpDNA)的核苷酸序列。这个圆形的双链 DNA 长 153699bp,由两个各长 26360bp 的反向重复(IR)区、一个长 83372bp 的大单拷贝区和一个长 17607bp 的小单拷贝区组成。这个质体基因组包含 81 个蛋白编码基因、30 个独特的 tRNA 和 4 个 rRNA 基因。此外,还有六个假设编码区(ycf1、ycf2、ycf3、ycf4、ycf15 和 ycf68)和两个开放阅读框(ORF42 和 ORF56),这些也存在于其他物种的叶绿体基因组中。V. patulum 叶绿体基因组的基因排列和基因含量与百合科的菝葜、百合属的百合和阿氏秋海棠、以及百合目(百合科、百合科和秋海棠科)的其他物种相似。然而,与其他物种相比,V. patulum 中 rps16 外显子 2 的缺失导致了大单拷贝区的差异。这些物种的基因之间的碱基替换率非常相似。此外,在所有观察到的百合目物种中,反向重复区的碱基替换率都小于单拷贝区。IR 区在 V. patulum 中扩展到 trnH_GUG,在百合属的百合和阿氏秋海棠中扩展到 rps19 的一部分,在菝葜中扩展到整个 rps19。此外,百合目物种之间 rbcL-accD-psaI 区的 IGS 长度是可变的,这表明该区域可能是插入缺失事件的热点,也是百合目系统发育研究的信息位点。总的来说,作为一种有潜力的药用植物,藜芦属的整个叶绿体基因组将有助于该属的遗传应用研究。