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Recombinant DNA technology called transgenesis is often used to add a foreign gene or remove a detrimental gene from an organism. Such genetically modified organisms are called transgenic organisms.
The first-ever transgenic plant was a tobacco plant developed in 1983 that showed resistance against the tobacco mosaic virus. Since then, many transgenic plants have been developed and commercialized for improving the agricultural, ornamental, and horticultural value of a crop plant. Transgenic...
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Novel Agrobacterium fabrum str. 1D1416 for Citrus Transformation.

Diaa Alabed1, Redeat Tibebu1, Menaka Ariyaratne1

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Researchers screened wild Agrobacterium strains for citrus transformation. Strain 1D1416 showed high efficiency and low tissue damage, offering a new tool for genetic improvement in citrus crops.

Keywords:
Agrobacterium rhizogenesAgrobacterium tumefaciensGAANTRY systemcitrus

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Area of Science:

  • Plant Biotechnology
  • Microbiology
  • Agricultural Science

Background:

  • Citrus is a globally significant fruit crop facing challenges in production and quality.
  • Genetic transformation using Agrobacterium is crucial for developing improved citrus traits.
  • Existing Agrobacterium strains for citrus transformation are limited, necessitating exploration of wild strains.

Purpose of the Study:

  • To screen wild Agrobacterium strains for their efficacy in citrus genetic transformation.
  • To identify novel Agrobacterium strains that can improve transformation efficiency and reduce negative impacts on citrus tissues.
  • To develop an optimized Agrobacterium-mediated transformation system for citrus.

Main Methods:

  • Screening of forty-one wild-type Agrobacterium strains isolated from woody species.
  • Evaluation of transient transformation frequency using Carrizo epicotyl explants and the DsRed gene.
  • Assessment of Agrobacterium strain performance based on transformation rates, shoot regeneration, necrosis, and mortality.
  • Genome sequencing of the identified superior strain for further genetic manipulation.
  • Application of GAANTRY technology for enhanced transformation capabilities.

Main Results:

  • Five wild Agrobacterium strains demonstrated DNA transfer capability into citrus cells.
  • Strain 1D1416 achieved the highest transient transformation frequency (88%) in Carrizo epicotyl explants, surpassing the control strain EHA105 (84%).
  • Strain 1D1416 exhibited significantly lower necrosis and mortality rates compared to controls.
  • Efficient DsRed gene transfer and gall induction were observed in mature tissues of various citrus cultivars, including Mexican lime, lemon, Washington navel orange, and clementine.
  • Genome sequencing enabled the disarming of strain 1D1416's native T-DNA and integration of GAANTRY technology.

Conclusions:

  • Wild Agrobacterium strain 1D1416 is a highly effective agent for citrus genetic transformation.
  • This novel strain offers advantages over existing methods, including improved efficiency and reduced tissue damage.
  • The optimized transformation protocol using strain 1D1416 represents a valuable advancement for citrus breeding and genetic improvement programs.