Publications by authors named "Derek W Barchenger"

Article Synopsis
  • Aphid-transmitted viruses significantly impact pepper production in Africa, with emerging variants and mixed infections complicating management efforts.
  • The study reviews the distribution and genetic resources available for resistance against key viruses like PVMV, PVY, ChiVMV, and CMV, while highlighting the lack of understanding regarding co-infections.
  • Emphasizing the need for further research, the text suggests developing more diverse genetic material and utilizing marker-assisted selection to enhance resistance against these viral strains.
View Article and Find Full Text PDF
Article Synopsis
  • Phytophthora root rot caused by the pathogen Phytophthora capsici significantly affects chile pepper production, prompting a study to find genetic resistance in 157 Capsicum genotypes.
  • Using genome-wide association studies (GWAS) with over 55,000 SNP markers, researchers identified 330 significant markers linked to resistance, with some markers indicating more durable resistance across multiple plant isolates.
  • The findings will support future breeding programs and marker-assisted strategies to enhance resistance against Phytophthora root rot in chile peppers, focusing on specific candidate genes associated with resistance traits.
View Article and Find Full Text PDF

Chilli leaf curl virus disease caused by begomoviruses, has emerged as a major threat to global chilli production, causing severe yield losses and economic harm. Begomoviruses are a highly successful and emerging group of plant viruses that are primarily transmitted by whiteflies belonging to the complex. The most effective method for mitigating chilli leaf curl virus disease losses is breeding for host resistance to .

View Article and Find Full Text PDF
Article Synopsis
  • The study investigates the impact of different rating systems on identifying quantitative trait loci (QTL) related to resistance against a harmful pathogen affecting pepper crops.
  • Two methods were compared, revealing that the Bosland and Lindsey system better detected specific QTL than the Black system, although each had unique strengths in identifying certain QTL.
  • Resistance inheritance patterns showed a 7:9 segregation ratio, suggesting a complex genetic interaction influenced by incomplete gene action and the characteristics of the tested population.
View Article and Find Full Text PDF

Chile pepper ( spp.) is a major culinary, medicinal, and economic crop in most areas of the world. For more than hundreds of years, chile peppers have "defined" the state of New Mexico, USA.

View Article and Find Full Text PDF
Article Synopsis
  • Tomato is a key vegetable crop globally, and bacterial wilt (BW) caused by Ralstonia solanacearum is a major threat to its production.
  • Research has identified two main loci (Bwr-6 and Bwr-12) linked to BW resistance, but additional unidentified factors also contribute to this resistance.
  • Analysis of genome sequences from resistant and susceptible tomato lines revealed significant genetic variations, including a notable SNP in the Asc gene associated with the Bwr-3 locus, highlighting new avenues for understanding and improving BW resistance.
View Article and Find Full Text PDF

Background: Phytophthora root rot, caused by Phytophthora capsici, is a major disease affecting Capsicum production worldwide. A recombinant inbred line (RIL) population derived from the hybridization between 'Criollo de Morellos-334' (CM-334), a resistant landrace from Mexico, and 'Early Jalapeno', a susceptible cultivar was genotyped using genotyping-by-sequencing (GBS)-derived single nucleotide polymorphism (SNP) markers. A GBS-SNP based genetic linkage map for the RIL population was constructed.

View Article and Find Full Text PDF

Wild relatives of domesticated Capsicum represent substantial genetic diversity and thus sources of traits of potential interest. Furthermore, the hybridization compatibility between members of Capsicum species complexes remains unresolved. Improving our understanding of the relationship between Capsicum species relatedness and their ability to form hybrids is a highly pertinent issue.

View Article and Find Full Text PDF

is the most devastating pathogen for chile pepper production worldwide and current management strategies are not effective. The population structure of the pathogen is highly variable and few sources of widely applicable host resistance have been identified. Recent genomic advancements in the host and the pathogen provide important insights into the difficulties reported by epidemiological and physiological studies published over the past century.

View Article and Find Full Text PDF

Peppers (Capsicum sp.) are an increasingly important crop because of their use as a vegetable, spice, and food colorant. The oomycete Phytophthora capsici is one of the most devastating pathogens to pepper production worldwide, causing more than $100 million in losses annually.

View Article and Find Full Text PDF