Genotyping-by-Sequencing-Based Genetic Analysis of African Rice Cultivars and Association Mapping of Blast Resistance Genes Against Magnaporthe oryzae Populations in Africa.

Understanding the genetic diversity of rice germplasm is important for the sustainable use of genetic materials in rice breeding and production. Africa is rich in rice genetic resources that can be utilized to boost rice productivity on the continent. A major constraint to rice production in Africa is rice blast, caused by the hemibiotrophic fungal pathogen Magnaporthe oryzae.

Genome-Wide Association Mapping of Rice Resistance Genes Against Magnaporthe oryzae Isolates from Four African Countries.

Rice blast disease is emerging as a major constraint to rice production in Africa. Although a traditional gene-tagging strategy using biparental crosses can effectively identify resistance (R) genes or quantitative trait loci (QTL) against Magnaporthe oryzae, the mapping procedure required is time consuming and requires many populations to investigate the genetics of resistance. In this report, we conducted a genome-wide association study (GWAS) to rapidly map rice genes conferring resistance against eight M.

Five Species of Xanthomonads Associated with Bacterial Leaf Spot Symptoms in Tomato from Tanzania.

From 2008 to 2010, leaf spot symptoms were observed on tomato (Solanum lycopersicum Mill.) plants growing in the northern, central and southern highland regions of Tanzania. Symptoms were dark, circular to irregular, water-soaked spots surrounded by chlorotic halos.

Genetic Diversity and Pathogenic Variation of Common Blight Bacteria (Xanthomonas campestris pv. phaseoli and X. campestris pv. phaseoli var. fuscans) Suggests Pathogen Coevolution with the Common Bean.

ABSTRACT Common bacterial blight (CBB), caused by Xanthomonas campestris pv. phaseoli and X. campestris pv.

First Report of Bacterial Speck of Tomato Caused by Pseudomonas syringae pv. tomato in Tanzania.

In April 2004, there was a serious outbreak of a tomato (Lypersicon esculentum Mill.) leaf spot disease in Mgeta, Mvomero District of Tanzania. The disease was characterized by lesions on green tomato fruits that were small, sunken, and black and were surrounded by darker green haloes.