2015 BGRI Poster Abstracts

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Displaying 81 - 90 of 415

Durable and High Level Stripe Rust Resistance in Wheat Cultivar Madsen Conferred by Five QTL for All-stage or HTAP Resistance

Stripe rust, caused by Puccinia striiformis f. sp. tritici, is the most destructive disease of wheat in the US Pacific Northwest. Durable high-temperature adult-plant (HTAP) resistance to stripe rust has been emphasized for breeding wheat cultivars and the resistance level has been gradually increased since the early 1960s. Wheat cultivar Madsen has been widely grown, intensively used in breeding programs, and has exhibited durable and high level resistance to stripe rust since its release...Read complete abstract

Primary Author: Chen, USDA-ARS, Pullman, WA, USA

Keywords: stripe rust

Identifying quantitative trait loci for high-temperature adult-plant resistance to stripe rust in six mapping populations of wheat

High-temperature adult-plant (HTAP) resistance to stripe rust in wheat has proven to be durable. Molecular markers tightly linked to HTAP resistance offer an alternative to phenotypic selection and are useful for pyramiding HTAP resistance genes with other types of resistance. This study assessed HTAP resistance in six diverse mapping populations derived from four types of crosses: 1. Resistant × Susceptible, IDO444 × Rio Blanco (winter wheat RILs) and UI Silver × Shaan 89150 (winter wheat...Read complete abstract

Primary Author: Chen, University of Idaho, USA

Keywords: stripe rust, breeding, resistance, APR

Resistance to tan spot in Tunisian wheat landraces

In order to identify sources of resistance to tan spot caused by Pyrenophora tritici-repentis, 359 local wheat accessions were evaluated for reaction to the Oued-Mliz isolate in controlled conditions and in the field. Two and three assessments were carried out at the seedling and adult stages, respectively. There was a highly significant accession effect and 4.2% of accessions were highly resistant in both controlled conditions and the field. Assessments at the seedling stage were positively...Read complete abstract

Primary Author: Cherif, National Agronomic Institute of Tunisia


Emerging private sector involvement in wheat seed research and production in India

Wheat is one of the most important food crops of the world. India is the second largest producer of wheat, currently producing 95 million tons from about 30 million hectares. Looking ahead to 2050, India needs to constantly increase production to about 150 million tons, to meet the rising population and demand. With area under cultivation having no room for growth, productivity will be the main pillar for growing production. Currently India?s yield of 3.1 t/ha has plenty room for growth as...Read complete abstract

Primary Author: Chintada, Sathguru Management Consultants


Reaction of Bhutanese wheat cultivars and differential lines to rust diseases at mid and low altitudes in Bhutan

Wheat rusts are one of the important diseases that limit the production and downgrade wheat quality. Three rust diseases of wheat are stem rust caused by Puccinia graminis Pers. f. sp. tritici Eriks., stripe rust caused by Puccinia striiformis Westend. f. sp. tritici Eriks., and leaf rust caused by Puccinia triticina Eriks. This study was conducted to determine the reaction of wheat varieties to wheat rusts at different altitudes. Field...Read complete abstract

Primary Author: Chophel, National Plant Protection Center

Keywords: altitude

Segregation for aggressiveness in sexual offspring of the yellow rust pathogen Puccinia striiformis

Recent events in worldwide populations of the fungal pathogen Puccinnia striiformis, which causes the yellow rust disease on wheat and other cereals, have suggested that other factors than shifts in virulence can lead to epidemic events. For...Read complete abstract

Primary Author: Chris Sorensen, Aarhus University, Denmark


The development and application of near-isogenic lines for monitoring cereal rust pathogens

The purpose of monitoring cereal rust pathogens is to provide a basis for disease control strategies that include breeding for resistance, predicting disease response in commercial cultivars and responding to the dynamics of pathogen change. The means of achieving this vary from regular collection surveys based on assessments of sample collections in greenhouse tests, to monitoring and recording static trap plots. Factors governing the method of approach include the size of the target region...Read complete abstract

Primary Author: Colin Wellings, The University of Sydney, Plant Breeding Institute, Australia


Global status of stripe rust

Stripe rust, caused by Puccinia striiformis, has been an important disease of wheat, barley, rye, triticale and certain graminaceous hosts for centuries. The significance of the disease on cultivated cereals has waxed and waned according to the vagaries of climate, inoculum levels and susceptible varieties. A progressive understanding of pathogen biology has revealed levels of specialisation between and within host groups, and these had varying impacts on the hosts concerned. The...Read complete abstract

Primary Author: Colin Wellings, The University of Sydney, Plant Breeding Institute, Australia


Resistance to aphids in synthetic hexaploid wheat derived lines

Aphids are major pests of wheat, able to cause up to 40% yield reduction solely due to direct feeding and up to 60% when feeding is combined with the transmission of viral diseases. Wheat resistance to aphids has proven to be effective in protecting yields and also in reducing the transmission rate of viral diseases. Moreover, aphid resistance is fundamental to reduce the negative impacts that the indiscriminate use of insecticides have on the environment and human health. In this study we...Read complete abstract

Primary Author: Crespo-Herrera, CIMMYT

Keywords: resistance, aphids

An integrated genomics approach to combat the wheat yellow rust pathogen

We will present an update on the BBSRC-funded SCPRID project “Maximizing the potential for sustainable and durable resistance to the wheat yellow rust pathogen”. This aims to understand the molecular basis of Puccinia striiformis f. sp. tritici (...Read complete abstract

Primary Author: Cristobal Uauy, John Innes Centre, UK