桉樹SWEET基因家族的分析
[Abstract]:The SWEET family of genes is a new sugar transporter, which mainly contains two MtN3/saliva transmembrane domains, while a few prokaryotes contain only one. The MtN3/saliva family of eukaryotes mainly consists of seven transmembrane helices, but 16 of the 17 reported members of the SWEET family in Arabidopsis contain seven transmembrane helices. A gene contains six transmembrane helixes (AT1G66770). Three transmembrane MtN3/saliva domains in prokaryotes are replicated, resulting in the production of two MtN3/saliva domain SWEET proteins in eukaryotes. Because of this special structure, the prokaryote family of genes is often referred to as Semi SWEETs. Less, recent studies have shown that SWEET family genes may act as sugar transporters or interact with ion transporters to promote ion transport and regulate different physiological processes including transporting carbohydrates, development and environmental adaptability. The main results are as follows: 1. All the genes of Eucalyptus and Arabidopsis containing MtN3/Saliva domain were retrieved from the phytozome database. Among them, 52 homologous sequences were found in Eucalyptus, and one Eucalyptus homologous sequence was found in Arabidopsis. Seventeen sequences contained two MtN3/saliva domains, and the transmembrane region was greater than or equal to six, all of which were defined as SWEET family. Of the 52 Eucalyptus homologous sequences, 40 sequences had more than or equal to six transmembrane domains. Except EgSWEET9c had three MtN3/saliva domains, the rest of the genes contained two MtN3/saliva domains. Six sequences have two MtN3/saliva domains, but less than six transmembrane domains, which may be members of the SWEET family. Six sequences have only one MtN3/saliva domain, which is similar to the structure of Simi SWEETs in prokaryotes. 947 genes from 37 different species contained MtN3/saliva gene. The 947 genes were divided into 11 branches and some OG branches. These genes were divided into four subfamilies A1, A2, A3 and B1. The A1 subfamily was mainly the third branch, including AtSWEET4-8 and six Eucalyptus genes. The A2 subfamily was mainly the fifth branch, including AtSWEET16, AtSWEET1 and six eucalyptus. Tree genes, A3 subfamily is mainly 1,2,4 three branches, including AtSWEET 1-3 and 13 Eucalyptus genes, B1 subfamily is mainly 6-11 branches, including AtSWEET 9-15 and 24 Eucalyptus genes, there are two genes not in the above subfamily, belong to OG branching. Among the 40 gene sequences with transmembrane region greater than or equal to 6, the number of amino acids in the two Mt N3/saliva family domains was about 90, and the open reading frame (ORF) of these 40 genes ranged from 1208 BP to 7084 bp. The open reading frame ranged from 529 BP to 4615 bp, and the number of exons ranged from 3 to 6. 4 On the basis of chromosome location information provided by phytozome database, 52 SWEET family genes containing MtN3/saliva domain were located on Eucalyptus chromosomes. There were 11 chromosomes in eucalyptus, but these 52 SWEET families were retrieved. Only 45 genes were located on chromosomes, and most of them appeared in clusters. The other 7 genes may not be located on spliced chromosomes. The 45 genes located on chromosomes were mainly distributed on 8 chromosomes. 5 expression level analysis showed that 34 genes were highly expressed at the tip of stem and 37 genes were on the surface of young leaves. The expression of 36 genes was higher in the old leaves, 31 genes were the highest in xylem, and 40.6 genes were induced in phloem. The results showed that 11 genes were up-regulated, 2 genes were down-regulated and 7 genes were basically unchanged under glucose treatment. Under the treatment of NaCl solution, 11 genes were up-regulated, 2 genes were down-regulated, and 3 genes were basically unchanged. Under the treatment of NaCl solution, 11 genes were up-regulated, 2 genes were down-regulated and 7 genes were basically unchanged. These results provide a reference for understanding the SWEET family genes of Eucalyptus.
【學(xué)位授予單位】:華南農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:S792.39;Q943.2
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