Genetic Transformation of Common Beans (Phaseolus vulgaris): Achievements and Challenges

Genetic transformation is a valuable tool for the development of plant varieties with desirable traits that are present in the species germplasm with low genetic variability, i.e., resistance to pests and diseases and nutritional improvements. Although transgenic and edited crops have been successfully obtained for many plant species, it remains difficult for common beans (Phaseolus vulgaris), due to their recalcitrance to in vitro regeneration. This review discusses various methods employed, such as Agrobacterium-mediated transformation, biolistic (particle bombardment), and hairy root systems, noting their respective efficiencies and limitations. While there has been progress, including the development of the first transgenic common bean cultivar approved for commercialization (Embrapa 5.1), the article emphasizes the need for improved protocols and techniques for more efficient genetic transformation. It also touches upon the potential of gene editing technologies like CRISPR/Cas9 in overcoming existing challenges and facilitating the development of resilient bean varieties.