A genetic analysis of adult plant resistance to stripe rust in the wheat cultivar Kariega

Ramburan, V. P.; Pretorius, Z. A.; Louw, J. H.; Boyd, Lesley A.; Smith, Philip H.; Boshoff, W. H. P.; Prins, R.

doi:10.1007/s00122-003-1567-7

Cited by 82 publications

(70 citation statements)

References 33 publications

(42 reference statements)

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“…This result confirms that our controlled greenhouse environment mimicked well the field conditions. The good correlation observed here between greenhouse and field phenotypes is important since there are contrasting reports about the reproducibility of field evaluation results under greenhouse conditions (Ramburan et al 2004). …”

Section: Effect Of Yr36 Is Temperature Dependentsupporting

confidence: 53%

High-temperature adult-plant (HTAP) stripe rust resistance gene Yr36 from Triticum turgidum ssp. dicoccoides is closely linked to the grain protein content locus Gpc-B1

et al. 2005

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Several new races of the stripe rust pathogen have become frequent throughout the wheat growing regions of the United States since 2000. These new races are virulent to most of the wheat seedling resistance genes limiting the resistance sources that can be used to combat this pathogen. High-temperature adult-plant (HTAP) stripe rust resistance has proven to be more durable than seedling resistance due to its non-racespecific nature, but its use is limited by the lack of mapping information. We report here the identification of a new HTAP resistance gene from Triticum turgidum ssp. dicoccoides (DIC) designated as Yr36. Lines carrying this gene were susceptible to almost all the stripe rust pathogen races tested at the seedling stage but showed adult-plant resistance to the prevalent races in California when tested at high diurnal temperatures. Isogenic lines for this gene were developed by six backcross generations. Field tests in two locations showed increased levels of field resistance to stripe rust and increased yields in isogenic lines carrying the Yr36 gene compared to those without the gene. Recombinant substitution lines of chromosome 6B from DIC in the isogenic background of durum cv. Langdon were used to map the Yr36 gene on the short arm of chromosome 6B completely linked to Xbarc101, and within a 2-cM interval defined by PCR-based markers Xucw71 and Xbarc136. Flanking locus Xucw71 is also closely linked to the grain protein content locus Gpc-B1 (0.3-cM). Marker-assisted selection strategies are presented to improve stripe rust resistance and simultaneously select for high or low Gpc-B1 alleles.

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Section: Effect Of Yr36 Is Temperature Dependentsupporting

confidence: 53%

High-temperature adult-plant (HTAP) stripe rust resistance gene Yr36 from Triticum turgidum ssp. dicoccoides is closely linked to the grain protein content locus Gpc-B1

et al. 2005

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“…Vazquez et al [43] identified multiple APR QTL in Stephens with one identified on 4A by linkage to SSR marker Xbarc70; Eltan did not share that allele [31]. The 4A QTL from IDO444, described by Chen et al [42], was found at a similar location to a QTL in Kariega [41]. These two varieties and Avocet S share a common allele at Xgwm160.…”

Section: Varietymentioning

confidence: 99%

Novel QTL for Stripe Rust Resistance on Chromosomes 4A and 6B in Soft White Winter Wheat Cultivars

2016

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Stripe rust (caused by Puccinia striiformis f. sp. tritici) of wheat (Triticum aestivum) is a devastating disease in temperate regions when susceptible varieties are grown and environmental conditions sustain high disease pressures. With frequent and severe outbreaks, disease resistance is a key tool for controlling stripe rust on wheat. The goal of this research was to identify quantitative trait loci (QTL) involved in stripe rust resistance from the important US Pacific Northwest soft white winter wheat varieties "Eltan" and "Finch". An F 2:5 recombinant inbred line (RIL) mapping population of 151 individuals derived from the FinchˆEltan cross was developed through single seed descent. A linkage map comprising 683 unique single nucleotide polymorphism (SNP) loci and 70 SSR markers were used to develop 22 linkage groups consisting of 16 of the 21 chromosomes. Stripe rust data were collected on the RILs during the summers of 2012 to 2014. QTL analysis identified two genomic regions on chromosomes 4A (QYrel.wak-4A) and 6B (QYrfi.wak-6B) associated with resistance from Eltan and Finch, respectively. The results of the QTL analysis showed that QYrel.wak-4A and QYrfi.wak-6B reduced infection type and disease severity. Based upon both molecular and phenotypic differences, QYrel.wak-4A is a novel QTL for adult plant resistance (APR) to stripe rust.

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“…Wheat farmers were confronted with new disease management decisions, fungicide application costs and yield losses, susceptible cultivars had to be withdrawn and large breeding populations were discarded due to susceptibility (Pretorius et al, 2007a). Reports on pathogenic variation (Boshoff & Pretorius, 1999;Boshoff et al, 2002a), chemical control (Boshoff et al, 2003), sources of resistance (Boshoff et al, 2002b;Ramburan et al, 2004;Prins et al, 2005) and screening techniques (Pretorius et al, 2007b) laid the foundation for managing this disease. Through careful breeding, selection and screening many South African wheat cultivars are currently considered resistant or moderately resistant to stripe rust.…”

Section: Disease Controlmentioning

confidence: 99%

An overview of the context and scope of wheat (Triticum aestivum) research in South Africa from 1983 to 2008

Smit¹,

Tolmay²,

Barnard³

et al. 2010

South African Journal of Plant and Soil

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The domestic requirement for wheat in South Africa is approximately 2.8 million tons and annually the shortfall on local production is imported to meet the demand. During the past 25 years two distinct wheat marketing mechanisms characterised the wheat industry, impacting significantly on both research and industry. In 1996 the single channel marketing system through the Wheat Board made way for a liberal marketing environment in which market forces of supply and demand determine price. This refocused most research activities on factors to lower input costs and risks, while increasing the profitability of wheat production. Significant challenges were experienced with much stricter milling and baking quality requirements impacting on not only the development of adapted wheat cultivars for South African conditions, but also on fertiliser and cultivar recommendations, as well as production practices. Minimum tillage, preharvest sprouting, as well as the threat of Russian wheat aphid and stripe rust were some of the pertinent challenges faced during this time. Significant scientific breakthroughs of international importance were made with regard to the physiological and biochemical nature of insect resistance and plant defence as well as the transfer of resistance genes from alien species. This review provides an overview of the most pertinent wheat research undertaken from 1983 to 2008.

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A genetic analysis of adult plant resistance to stripe rust in the wheat cultivar Kariega

Cited by 82 publications

References 33 publications

High-temperature adult-plant (HTAP) stripe rust resistance gene Yr36 from Triticum turgidum ssp. dicoccoides is closely linked to the grain protein content locus Gpc-B1

High-temperature adult-plant (HTAP) stripe rust resistance gene Yr36 from Triticum turgidum ssp. dicoccoides is closely linked to the grain protein content locus Gpc-B1

Novel QTL for Stripe Rust Resistance on Chromosomes 4A and 6B in Soft White Winter Wheat Cultivars

An overview of the context and scope of wheat (Triticum aestivum) research in South Africa from 1983 to 2008

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