2015 BGRI Poster Abstracts

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Displaying 71 - 80 of 415

Resistance to race TKTTF of Puccinia graminis f. sp. tritici with virulence to SrTmp gene in Ethiopian bread wheat lines

Puccinia graminis f. sp. tritici (Pgt) is the major wheat production constraint in Ethiopia causing recurrent epidemics that resulted in the withdrawal of widely grown wheat cultivars from production. Among the current Pgt races detected in Ethiopia, TKTTF is the most frequent and has caused a severe epidemic in the south wheat growing regions (Bale and Arsi) after its first detection in 2012. Therefore, to avert the current situation, identifying sources of resistance to race TKTTF in...Read complete abstract

Primary Author: Bulbula, Ethiopian Institute of Agricultural Research

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Re-emergence of stem rust at epidemic levels in Argentina and Uruguay in 2014

Argentina and Uruguay are neighboring countries located in the same rust epidemiological area.  The last significant stem rust epidemic occurred in 1950. Since then, stem rust was frequently observed in experimental fields and off-season nurseries, but was mostly absent in commercial fields. During 2014, 4.6 million ha of wheat were grown, and there was a widespread incidence of stem rust, reaching levels of 80S on susceptible cultivars in both countries. Yield losses of 13 to 21% were...Read complete abstract

Primary Author: Campos, National Institute of Agricultural Technology (INTA), Argentina

Keywords: Argentina, Uruguay, stem rust

Physiological specialization of Puccinia triticina on wheat in Argentina, 2013

Leaf rust is the most important wheat disease in Argentina; 4.2 M ha of wheat were grown in 2014. The objective of the study was to identify avirulence/virulence phenotypes of the Pt population in leaf rusted samples collected in wheat-growing areas during 2013. Single uredinial isolates were taken from samples and tested on Thatcher near-isogenic lines and some local varieties. Resistance genes in sets of four included: Lr1, Lr2a, Lr2c, Lr3; Lr9, Lr16, Lr24, Lr3ka; Lr11, Lr17,...Read complete abstract

Primary Author: Campos, National Institute of Agricultural Technology (INTA), Argentina

Keywords: Argentina, leaf rust

Sources of resistance to stem rust in the USDA Barley iCore Collection

Stem rust is an important disease of wheat and barley. Barley is genetically vulnerable to stem rust with few identified resistance genes and sources. Stem rust resistance breeding is largely based on the gene Rpg1, first incorporated into North American barley cultivars in the 1940s. To identify potentially new resistance sources, the USDA-ARS National Small Grains Barley iCore Collection (1,860 accessions) was evaluated for reaction to stem rust at the seedling and adult stages....Read complete abstract

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

Keywords: stem rust, barley

Two phases of an adult plant resistance response in wheat to Puccinia graminis f. sp. tritici

Adult plant resistance (APR) to stem rust, caused by Puccinia graminis f. sp. tritici (Pgt), is often conferred by multiple minor genes and has the potential to be durable. A preceding project identified two Kenyan wheat lines (W1406 and W6979) from the Genome Resource Unit (Norwich, UK) that exhibit APR to Pgt. The aim of this study was to investigate the APR response to Pgt race PTKST in W1406 and W6979 compared to 37-07, a susceptible control line. Histological investigation of inoculated...Read complete abstract

Primary Author: Castelyn, University of the Free State, South Africa

Keywords: stem rust

Durum wheat genome reveals the signature of 10,000 years of selection

The domestication of wild emmer wheat ~10,000 years ago by early agrarian societies have led to the selection of domesticated emmer and subsequently of durum wheat through a process of selection for non-brittle rachis and free-threshing forms. Durum wheat and became established as a prominent crop only ~1,500-2,000 years ago. We have completed the 10.45 Gb assembly of the 14 chromosomes of the modern DW cultivar 'Svevo' and provides, via comparison with the wild emmer assembly, an account of...Read complete abstract

Primary Author: Cattivelli, CREA Research Centre for Genomics and Bioinformatics

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Enrichment of Indian wheat germplasm with stripe rust resistant genes

Stripe rust, is a major constraint to wheat production in the more than 12.8 m ha region of the Northern Hills and North Western Plains zones in India. The previously deployed resistance genes Yr9 and Yr27 are no longer effective. New sources of resistance (Yr5, Yr10, Yr15, Yr24) became available under the umbrella of an Indo-Australian collaborative project. A set of advanced backcross derivative lines out yielded the checks in preliminary evaluations and were promoted to station-level (16...Read complete abstract

Primary Author: Chatrath, ICAR-Indian Institute of Wheat and Barley Research, Karnal

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Spike photosynthesis and its role in grain filling in Indian wheat (Triticum aestivum L.)

The flag leaf and spike are the prime organs in wheat (Triticum aestivum L.) which contribute majorly for spike photosynthesis and eventually aid in grain filling. In this study we have tried to elucidate the effect of abiotic stress on the grain filling and spike photosynthesis. In order to unravel the role of flag leaf, awn, and spike in wheat grain filling and spike photosynthesis, 1000-kernel weight were calculated after removing flag leaves, awns, and by shading the spike in four wheat...Read complete abstract

Primary Author: Chaudhary, Department of Plant Molecular Biology, University of Delhi South Campus

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Genetic relationship between wheat stem rust resistance genes Sr36 and Sr39

Stem rust resistance genes Sr39 (RL6082) and Sr36 (Cook) were transferred from Aegilops speltoides and Triticum timopheevi to chromosome 2B of wheat. Both genes are located on large translocated segments. Genotypes carrying Sr36 and Sr39 produce infection types (ITs) 0; and 2, respectively, against avirulent pathotypes. This investigation was planned to study the genetic relationship between these genes with the aim of...Read complete abstract

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

Keywords: stem rust, Sr36, Sr39, resistance

Genetics of stem rust resistance in South African winter wheat varieties

Most South African winter wheat varieties display all stage resistance (ASR) to stem rust caused by Puccinia graminis f. sp. tritici (Pgt). To study inheritance, four resistant varieties were crossed to a susceptible parent (Line 37) and F2 populations were phenotyped at the seedling stage with stem rust race PTKST (Ug99 lineage). Populations derived from varieties Koonap, Komati, Limpopo and SST 387 segregated in a 3:1 ratio, indicating that a single, dominant gene confers resistance in...Read complete abstract

Primary Author: Chemonges, University of the Free State

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