Pyrus sugar transport gene PbSWEET4 and applications thereof
A gene and pear-derived technology, applied in the field of pear sugar transport gene PbSWEET4 and its recombinant expression vector, can solve the problems of lack of research on the regulation mechanism, achieve the effect of regulating soluble sugar and promoting leaf senescence
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Embodiment 1
[0025] Example 1, analysis of expression pattern of pear PbSWEET4 gene during pear leaf development.
[0026] RNA was extracted from the leaves of 'Dangshan' pear. The RNA was extracted using the CTAB method (Gasic et al., 2004), digested with DNase I (Invitrogen) to remove genomic DNA contamination in the RNA, and then reverse-transcribed by TOYOBO kit (purchased First-strand cDNA was synthesized using 1 μg of RNA from TakaRa Company (operated according to the kit instructions). The first-strand cDNA obtained by reverse transcription was used for real-time fluorescent quantitative PCR (qRT-PCR) of PbSWEET4. Use pear PbTublin (Pbr042345.1) as an internal reference, and the nucleotide sequences of the primers are as follows:
[0027] Forward primer TUB-F: 5'-TGGGCTTTGCTCCTCTTAC-3' (SEQ ID No.5)
[0028] Reverse primer TUB-R: 5'-CCTTCGTGCTCATCTTACC-3' (SEQ ID No.6)
[0029] A gene-specific qRT-PCR primer pair was designed within the open reading frame of the PbSWEET4 gene usi...
Embodiment 2
[0034] Example 2, Cloning and vector construction of pear PbSWEET4 gene and its promoter
[0035] 1. the extraction of pear leaf total RNA, the method for cDNA synthesis are with embodiment 1. The forward primer sequence for amplifying PbSWEET4 is PbSWEET4-F1: 5'-ATGGCTACAGTAGCAGACAGTCAC (SEQ ID No. 3), and the reverse primer sequence is PbSWEET4-R1: 5'-TCACACTGCTGATGGTGTTTCAT (SEQ ID No. 4). High-fidelity DNA polymerase for gene cloning ( Super-Fidelity DNA Polymerase (P505-d1)) was purchased from Novozyme Biotechnology Company. The amplification reaction system is 50 μL, including 200 ng of cDNA, 25 μL of 2×Phanta Max Buffer, 1 μL of 10 mM dNTP, 1 μL of Phanta Max Super-Fidelity DNA Polymerase, 2 μL of each of the above primers at 10 μM, plus ddH 2 0 to 50 μL. The PCR reaction was completed on the Eppendorf amplification instrument according to the following procedures: pre-denaturation at 95°C for 3 minutes, denaturation at 95°C for 15 seconds, annealing at 60°C for 15 ...
Embodiment 3
[0039] Example 3, Qualitative analysis of GUS staining of transgenic Arabidopsis under the control of pear PbSWEET4 gene 2kb promoter at different developmental stages
[0040] The construction method of the PbSWEET4 promoter vector pMDC107-pPbSWEET4 is the same as that in Example 1. The final recombinant vector was transformed into Agrobacterium strain GV3101 by freeze-thaw method, then cultured in LB solid medium with 50 μg / mL kanamycin, 100 μg / mL rifampicin, and then sterilized with 10 mL centrifugation Tubes will be identified with the correct Agrobacterium strain for expansion until OD 600 The value is about 1-1.2, and the bacterial liquid is collected by centrifugation at 6000rpm for 10min. This vector was then transformed into wild-type Arabidopsis plants by the floral dip method (Clough and Bent, 1998). Using GUS staining solution (purchased from Suo Laibao, China), according to the instructions, four stages of Arabidopsis from fully developed rosette leaves (14 days...
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