The most possibilities (ML), BI, and MP phylogenetic show obviously revealed that subgenus Cyathophora made up brand new four build types: A
DNA base mutations can be divided into two categories based on their effects to the encoded amino acids: synonymous mutations (Ks) and nonsynonymous mutations (Ka). Synonymous mutations do not result in amino acid changes, the frequency of which is represented by Ks; nonsynonymous mutations resulted in a change of amino acid, the frequency of which is indicated by Ka . Interestingly, the synonymous nucleotide substitutions occurred at a higher frequency than nonsynonymous substitutions, and thus Ka/Ks ratios are constantly <1 in most genes [9, 74], and our study is similar with this. Between different regions and genes, the Ka/Ks ratios were usually specific (Figure 8). Most conserved genes (56 of 65 genes) had an average Ka/Ks value ranging from 0 to 0.49 for the fifteen comparison groups, indicating that most genes were under purifying selection. On the contrary, the average Ka/Ks values of the ycf1 and ycf2 genes were >1 in the fifteen comparison groups, revealing that some selective pressure may execute on them in six Allium species. Previous studies have shown that ycf1 and ycf2 genes were two large open reading frames; they were important to tobacco, and the gene knockout experiments showed that ycf1 and ycf2 played important role in a healthy cell . Hu et al. suggested that plants have a variety of adaptation strategies in response to unforeseen environmental conditions. Recent studies about Allium species also suggested that the selective pressure in chloroplast genomes play an important role in Allium species adaptation and evolution [17, 71]. In our field investigations, the species of subgenus Cyathophora grows in slopes or grasslands with altitude ranging from 2700 m to 4800 m. The elevated Ka/Ks ratios observed about some genes in the six Allium species may suggest that it is relate to their specific living environment. What is more, there were four genes (matK, rpoB, petA, and rpoA) with Ka/Ks > 1 in at one or more pairwise comparisons (Figure 8, Table S3), and among these genes, rpoA was also undergone positive selection in species of Annonaceae . Previous study demonstrated that rpoA encodes the ? subunit of plastid RNA polymerase (PEP), which is in charge of the expression of most photosynthesis-related genes . It is generally believed that low temperature and strong ultraviolet radiation are not conducive to effective photosynthesis of plants; therefore, plants that survive and reproduce at high altitudes need a special photosynthetic protection strategy [79, 80]. In this study, Bu bağlantıyı şimdi hemen kontrol edin the population of subgenus Cyathophora is mainly distributed in the Qinghai-Tibet Plateau and its adjacent high-altitude regions . Therefore, we speculated that the positive selection of these genes may be related to the difference between their optimal growth environment.
5. Results
Right here, i sequenced, come up with, and you may annotated half a dozen chloroplast genomes out-of Allium with a high-throughput sequencing technology. The gene content material and you will orders of the cp genomes were really conventional, as well as their cp genomes are also quadripartite structure. Frequent sequence and SSRs are helpful offer having developing this new unit ino acids of your own half dozen species showed distinct codon need tastes, and in addition we should understand codon incorporate bias understand advancement processes. We along with discovered eight extremely varying preferred genes which will be regularly generate beneficial indicators getting phylogenetic studies and you can identify kinds inside Allium. The Ka/Ks research showed that some choosy pressure get use with the several family genes about chloroplast genomes away from half a dozen Allium L. kinds. cyathophorum, A. cyathophorum var. farreri, An excellent. spicatum, and A beneficial. mairei, and you can A beneficial. cyathophorum var. farreri has a deeper relationship with An excellent. spicatum. This study doesn’t only bring skills on cp genome features out-of variety inside subgenus Cyathophora and also supply beneficial genetic info to have phylogenetic studies out-of genus Allium.