2015 BGRI Poster Abstracts

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Displaying 61 - 70 of 415

Defining efficient phenotypic and genetic selection criteria to improve bread wheat yield under drought conditions

In the context of climate change, drought is one of the most important and complex abiotic stresses affecting crop production worldwide. The adoption of an appropriate technological package, principally drought tolerant varieties, may overcome these challenges to meet global food security needs for the rapidly growing human population, particularly in developing countries. Therefore, this research was carried out to identify efficient phenotypic and genetic selection criteria to identify...Read complete abstract

Primary Author: Bennani, National Institute of Agricultural Research

Keywords: bread wheat, yield, molecular markers

Occurrence of wheat rusts in Algeria and strategies to reduce crop losses

Wheat is the world's most widely grown food crop. New races of pathogens frequently overcome current resistant varieties. To address this issue Algeria has strategies for immediate action, medium term protection and long-term research efforts to develop new resistant wheat varieties. Yellow rust is a very important disease of wheat in Algeria where 60% of the wheat crop is grown under cooler high elevation climate conditions (2?C ? 15?C). Crop losses reached 80% during the 2004/2005...Read complete abstract

Primary Author: Bentounsi, University Mentouri of Constantine, Algeria

Keywords: stripe rust

Phylogenetic relationships among Puccinia triticina pathotypes on wheat in India

Leaf rust of wheat causes considerable losses worldwide. New pathotypes may cause previously resistant varieties to become susceptible. Identification of pathotypes and their relationships provide information for breeding efforts and designing management strategies. Traditional identification of pathotypes is based on responses of differential hosts. At present 50 pathotypes of P. triticina are maintained in the National collection. To determine variability and relationships at the...Read complete abstract

Primary Author: Bhardwaj, Indian Council of Agricultural Research

Keywords: India, leaf rust

Population dynamics of wheat stem rust fungus in Indian subcontinent during 2009-2015

Stem rust (Puccinia graminis tritici) (Pgt) epidemics have been reported from many wheat growing areas of the world. Stem rust races with virulence to Sr31 (Ug99 type races),are a threat to wheat producing African countries. Currently 11 different variants of the Ug99 lineage have been reported from different countries. Despite no report of Ug99 variants from any of the South Asian countries, the efforts are in place to counter the possible introduction of virulent wheat stem rust races....Read complete abstract

Primary Author: Bhardwaj, ICAR-IIWBR, Regional Station, Flowerdale,Shimla 171002 H.P. India

Keywords:

Global stem rust phenotyping network for wheat improvement

An effective partnership between CIMMYT, KALRO, EIAR and Delivering Genetic Gains in Wheat (DGGW) project on global stem rust phenotyping has made a significant progress and impact on the Global wheat community in addressing the threat of Ug99 race group and other important stem rust races in the region. International stem rust phenotyping networks play a key role in evaluating global wheat germplasm from many countries and institutions: identifying new sources of resistance, pre-breeding,...Read complete abstract

Primary Author: Bhavani, CIMMYT

Keywords: stem rust, varieties

Characterization of two new wheat stem rust races within the Ug99 lineage in South Africa

Two new races of the wheat (Triticum aestivum L.) stem rust pathogen, representing the fifth and sixth variants described within the Ug99 lineage, were detected in South Africa. Races TTKSP and PTKST (North American notation) were detected in 2007 and 2009, respectively. Except for Sr24 virulence, race TTKSP is phenotypically identical to TTKSF, a commonly detected race of Puccinia graminis f. sp. tritici (Pgt) in South Africa. PTKST is...Read complete abstract

Primary Author: Botma Visser, Department of Plant Sciences, University of the Free State, South Africa

Keywords:

Existence of divergent lineages, virulence phenotypes and DNA methylation in the Canadian Puccinia striiformis population

Puccinia striiformis f. sp. tritici (Pst), the cause of wheat stripe rust, is one of the most important pathogens of wheat. Attempts have been made in the past to characterize the worldwide genetic structure of Pst populations, excluding Canada. Characterization of 59 isolates identified 33 races with three most common races representing half of the population and subtle differences in races of eastern and western prairies. For molecular characterization, 48 isolates were sequenced to obtain...Read complete abstract

Primary Author: Brar, Crop Development Centre/Department of Plant Science, University of Saskatchewan, Saskatoon, Canada

Keywords:

Mapping and verification of two QTL conferring adult plant resistance to Pgt race TTKSK (Ug99) and domestic U.S. races in the Ecuadorian wheat cv. Morocho Blanco

The durability of stem rust resistance in wheat varieties is strengthened by the use of polygenic, and broad-spectrum sources of resistance. Adult plant resistance (APR) was observed in the mid-20th century Ecuadorian bread wheat cv. Morocho Blanco (PI 286545) in field tests at Njoro, Kenya, and at St. Paul. Morocho Blanco was susceptible to races TTKSK, RCRSC and TPMKC at the seedling stage. A doubled haploid (DH) mapping population was created from a cross between Morocho Blanco and the...Read complete abstract

Primary Author: Briggs, Department of Plant Pathology, University of Minnesota, USA

Keywords: QTL, ug99, stem rust

Comparative expression of three compatible rust systems identifies up-regulation of similar host-derived transmembrane nitrate transporters

Plant pathogens elicit host transcriptome changes that facilitate hyphal infection and proliferation throughout host tissues. Host genes targeted by the pathogen to facilitate infection have been identified as susceptibility genes (S-genes). As biotrophic pathogens, rust fungi must infect the host to obtain nutrients while suppressing defense responses and likely target host-derived genes to aid in this process. To further understand the host-pathogen interaction RNA-seq analyses were...Read complete abstract

Primary Author: Briggs, Department of Plant Pathology, University of Minnesota, USA

Keywords: host-rust system, nitrate tranporters

Harnessing the predictive power of epidemiological modelling for wheat yellow rust disease

Wheat yellow rust is a disease caused by the fungus Puccinia striiformis f. sp tritici (PST) that is a significant threat to wheat production worldwide. Recently, a novel approach called "Field Pathogenomics" was developed that allows acquisition of genotypic data from field samples of PST-infected wheat. This has enabled us to study the re-emergence of this pathogen in the UK and understand the different races that form the current PST population. However, the dynamics of pathogen...Read complete abstract

Primary Author: Bueno-Sancho, John Innes Centre

Keywords:

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