Chile (Capsicum annuum) plants transformed with the RB gene from Solanum bulbocastanum are resistant to Phytophthora capsici

Autoři: Suman Bagga aff001;  Yvonne Lucero aff001;  Kimberly Apodaca aff001;  Wathsala Rajapakse aff001;  Phillip Lujan aff002;  Jose Luis Ortega aff001;  Champa Sengupta-Gopalan aff001
Působiště autorů: Department of Plant and Environmental Sciences, New Mexico State University, Las Cruces, NM, United States of America aff001;  Department of Entomology, Plant Pathology, Weed Science, New Mexico State University, Las Cruces, NM, United States of America aff002
Vyšlo v časopise: PLoS ONE 14(10)
Kategorie: Research Article
doi: 10.1371/journal.pone.0223213


Phytophthora capsici is a soil borne pathogen, and is among the most destructive pathogens for Capsicum annuum (chile). P. capsici is known to cause diseases on all parts of the chile plants. Therefore, it requires independent resistance genes to control disease symptoms that are induced by each of the P. capsici strains. This requirement of multiple resistance genes to confer resistance to P. capsici, in chile makes breeding for resistance a daunting pursuit. Against this backdrop, a genetic engineering approach would be to introduce a broad host resistance gene into chile in order to protect it from different races of P. capsici. Notably, a broad host resistance gene RB from Solanum bulbocastanum has been shown to confer resistance to P. infestans in both S. tuberosum and S. lycopersicum. We agroinfiltrated the RB gene into the leaves of susceptible chile plants, demonstrating that the gene is also capable of lending resistance to P. capsici in chile. We introduced the RB gene into chile by developing an Agrobacterium tumefaciens mediated transformation system. The integration of the RB gene into the genome of the primary transformants and its subsequent transfer to the F1 generation was confirmed by genomic PCR using primers specific for the RB gene. A 3:1 ratio for the presence and absence of the RB gene was observed in the F1 progeny. In addition to showing resistance to P. capsici in a leaf inoculation experiment, about 30% of the F1 progeny also exhibited resistance to root inoculation. Our data, when taken together, suggests that the RB gene from S. bulbocastanum confers resistance against P. capsici in C. annuum, thereby demonstrating that the RB gene has an even broader host range than reported in the literature–both in terms of the host and the pathogen.

Klíčová slova:

Agrobacteria – Agrobacterium tumefaciens – Genetically modified plants – Leaves – Plant pathogens – Plant pathology – Polymerase chain reaction – Seeds


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2019 Číslo 10