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Ultrasonic-assisted agrobacterium-mediated plant germination seed gene transformation method

A technique for seed germination mediated by Agrobacterium, which is applied in the fields of plant genetic improvement, botany equipment and methods, biochemical equipment and methods, etc., can solve the problems of low conversion rate, achieve convenient material collection, simple operation, and reduce workload Effect

Inactive Publication Date: 2011-10-12
AGRI BIOTECH RES CENT OF SHANXI PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main disadvantage of this method is that the conversion rate is low, only about 0.6%, and it is easy to form chimeras

Method used

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  • Ultrasonic-assisted agrobacterium-mediated plant germination seed gene transformation method
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  • Ultrasonic-assisted agrobacterium-mediated plant germination seed gene transformation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1. basic conversion method:

[0016] 1) Agrobacterium LBA4404 carrying the plasmid Cry1Ac was used as the exogenous gene donor. The plasmid Cry1Ac carries the Bacillus thuringiensis toxin protein AC gene and the plant selection marker gene bar, which endows plants with resistance to the herbicide basta (the active ingredient is Phosphiothricin or PPT). This gene construction was provided by researcher Wang Guoying of the Institute of Crop Science, Chinese Academy of Agricultural Sciences. The physical map of plasmid Cry1Ac is as follows figure 1 shown.

[0017] 2) Maize (Zea mays L.) inbred lines Chang 7-2 and Zheng 58, sorghum restorer line Jinliang 5, and wheat variety Jinzuo 239 were used as receptor materials.

[0018] 3) Transformation operation process: first after rinsing the seeds for testing in tap water, place them in 75% ethanol for 30 seconds, then rinse them with sterile distilled water for 3 times in the ultra-clean workbench and put them in ...

Embodiment 2

[0020] Example 2. Molecular detection of transgenic plants:

[0021] Molecular testing of transgenic plants was carried out according to the "Molecular Cloning Handbook":

[0022] 1) In this experiment, the total plant DNA was extracted by CTAB (cetyltriethylammonium bromide) method, and agarose gel electrophoresis was used to check the DNA extraction results and carry out DNA quantification. According to the nucleotide sequences of the Cry1Ac and bar genes, the 20 bp nucleotide pairs at the 5' end and the 3' end were respectively used to design primers for PCR amplification. The primer sequences and their amplified fragment sizes are as follows:

[0023] Cry1Ac gene

[0024] Upstream primer: 5'-CTGACCGTGACCGTGCTG-3'

[0025] Downstream primer: 5'-TGGTGCCGTAGGCGAACT-3'.

[0026] Amplified fragment size: 500bp

[0027] Bar gene

[0028] Upstream primer: 5'-GTCTGCACCATCGTCAACC-3'

[0029] Downstream primer: 5'-ACTCGGCCGTCCAGTCGTA-3'.

[0030] Amplified fragment size: 201...

Embodiment 3

[0033] Example 3. Maize genetic transformation:

[0034] In order to explore the influence of various factors on the transformation rate, an experiment including three factors including scratching the germinated seeds, ultrasonic treatment and adding screening agent to the culture medium after 48 hours of co-cultivation was designed. The ultrasonic treatment also included 3 intensity levels (300W, 600W and 900W), and genetic transformation was carried out on the maize inbred line Chang 7-2. Each treatment had 4 repetitions, and 500 germinated seeds were used for each repetition. A total of 1333 basta-resistant plants were screened out from all treatments. After the plants screened by basta are transplanted into the field, more than 80% of the seedlings can grow normally. Most of the plants behaved normally during flowering, and only a small number of plants showed variations such as failure to meet the flowering period and not being able to disperse powder normally. Accordin...

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Abstract

The invention discloses an ultrasonic-assisted agrobacterium-mediated plant germination seed gene transformation method. Plant germination seeds are directly used as agrobacterium infection receptors, and tissue culture and plant regeneration processes are not needed. The method comprises the following steps of: performing scratch and ultrasonic treatment on growing point parts of receptor plant germination seeds in the seed germination process by using the plant germination seeds as the receptors and using agrobacterium Ti plasmids carrying exogenous gene fragments as gene vectors, and then culturing the seeds and the agrobacterium together, transferring exogenous genes to a receptor genome, and further determining the transformed plants by direct screening of the seeds or seedlings and polymerase chain reaction (PCR) amplification and Southern hybridization of the plant leaf DNA.

Description

technical field [0001] The invention relates to a plant gene transformation method, in particular to a new method which utilizes ultrasonic treatment to scratch and Agrobacterium-mediated direct transformation of plant germination seeds without tissue culture process. technical background [0002] A Chinese patent with the patent number ZL 01104185.4 discloses a transgenic method for direct transformation of corn germination embryos by using Agrobacterium. The seed is the recipient material, and the Agrobacterium Ti plasmid carrying the exogenous gene fragment is used as the gene donor. During the germination process of the plant seed, it is co-cultured with Agrobacterium, so that it can transfer the donor's exogenous gene fragment into the recipient genome. . This method uses plant germination seeds as receptors, which avoids the tedious and demanding plant tissue culture process. At the same time, using seeds as receptors, the cycle of transformed plants and seeds obtaine...

Claims

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Application Information

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IPC IPC(8): C12N15/84A01H5/00A01H1/02
CPCC12N15/8205
Inventor 孙毅杨丽艳杜建中郝曜山王亦学张丽君王铭于纪珍张婷婷
Owner AGRI BIOTECH RES CENT OF SHANXI PROVINCE
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