Adult plant resistance to leaf rust and stem rust of wheat in a newly developed recombinant inbred line population

Figlan, Sandiswa; Terefe, T.; Shimelis, Hussein; Tsilo, Toi J.

doi:10.1080/02571862.2017.1339131

Cited by 5 publications

(5 citation statements)

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“…Heritability ranged from 0.57 to 0.91 across experiments for all five studied traits (Table 3 ). Overall, the heritability of each trait was relatively high and similar to those reported in previous studies [ 35 , 56 , 57 ]. Furthermore, and most importantly, standards included in the experiments displayed similar phenotypic responses under speed breeding conditions to those displayed in the field.…”

Section: Discussionsupporting

confidence: 88%

Speed breeding for multiple quantitative traits in durum wheat

et al. 2018

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BackgroundPlant breeding requires numerous generations to be cycled and evaluated before an improved cultivar is released. This lengthy process is required to introduce and test multiple traits of interest. However, a technology for rapid generation advance named ‘speed breeding’ was successfully deployed in bread wheat (Triticum aestivum L.) to achieve six generations per year while imposing phenotypic selection for foliar disease resistance and grain dormancy. Here, for the first time the deployment of this methodology is presented in durum wheat (Triticum durum Desf.) by integrating selection for key traits, including above and below ground traits on the same set of plants. This involved phenotyping for seminal root angle (RA), seminal root number (RN), tolerance to crown rot (CR), resistance to leaf rust (LR) and plant height (PH). In durum wheat, these traits are desirable in environments where yield is limited by in-season rainfall with the occurrence of CR and epidemics of LR. To evaluate this multi-trait screening approach, we applied selection to a large segregating F2 population (n = 1000) derived from a bi-parental cross (Outrob4/Caparoi). A weighted selection index (SI) was developed and applied. The gain for each trait was determined by evaluating F3 progeny derived from 100 ‘selected’ and 100 ‘unselected’ F2 individuals.ResultsTransgressive segregation was observed for all assayed traits in the Outrob4/Caparoi F2 population. Application of the SI successfully shifted the population mean for four traits, as determined by a significant mean difference between ‘selected’ and ‘unselected’ F3 families for CR tolerance, LR resistance, RA and RN. No significant shift for PH was observed.ConclusionsThe novel multi-trait phenotyping method presents a useful tool for rapid selection of early filial generations or for the characterization of fixed lines out-of-season. Further, it offers efficient use of resources by assaying multiple traits on the same set of plants. Results suggest that when performed in parallel with speed breeding in early generations, selection will enrich recombinant inbred lines with desirable alleles and will reduce the length and number of years required to combine these traits in elite breeding populations and therefore cultivars.Electronic supplementary materialThe online version of this article (10.1186/s13007-018-0302-y) contains supplementary material, which is available to authorized users.

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Section: Discussionsupporting

confidence: 88%

Speed breeding for multiple quantitative traits in durum wheat

et al. 2018

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“…However, the significant positive correlations among LR races observed in this study (Table 5) suggested the involvement of genetic factors that are effective against all three races. The presence of strong positive correlations between APR to LR and SR at KRIAPI also indicated that genes conferring LR resistance are either closely linked or may have a pleiotropic effect on genes that control SR resistance [26,56]. Positive correlations were simultaneously observed between seedling resistance to LR races TQTHQ and TKTHT and APR to LR at KRIAPI, as well as between seedling resistance to SR race PKCTC and APR to SR at KRIAPI (Table 5).…”

Section: General Resistance Of Rils In Studied Environmentsmentioning

confidence: 95%

QTL Mapping for Seedling and Adult Plant Resistance to Leaf and Stem Rusts in Pamyati Azieva × Paragon Mapping Population of Bread Wheat

Genievskaya

Абугалиева

Rsaliyev³

et al. 2020

Agronomy

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Leaf rust (LR) and stem rust (SR) pose serious challenges to wheat production in Kazakhstan. In recent years, the susceptibility of local wheat cultivars has substantially decreased grain yield and quality. Therefore, local breeding projects must be adjusted toward the improvement of LR and SR disease resistances, including genetic approaches. In this study, a spring wheat segregating population of Pamyati Azieva (PA) × Paragon (Par), consisting of 98 recombinant inbred lines (RILs), was analyzed for the resistance to LR and SR at the seedling and adult plant-growth stages. In total, 24 quantitative trait loci (QTLs) for resistance to rust diseases at the seedling and adult plant stages were identified, including 11 QTLs for LR and 13 QTLs for SR resistances. Fourteen QTLs were in similar locations to QTLs and major genes detected in previous linkage mapping and genome-wide association studies. The remaining 10 QTLs are potentially new genetic factors for LR and SR resistance in wheat. Overall, the QTLs revealed in this study may play an important role in the improvement of wheat resistance to LR and SR per the marker-assisted selection approach.

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“…Heritability ranged from 0.57 to 0.91 across experiments for all five studied traits (Table 3.4). Overall, the heritability of each trait was relatively high and similar to those reported in previous studies (Poole et al, 2012;Richard et al, 2015;Figlan et al, 2017). Furthermore, and most importantly, standards included in the experiments displayed similar phenotypic responses under speed breeding conditions to those displayed in the field.…”

Section: Rapid Phenotyping Fixed Lines For Crown Rot Root Traits Lesupporting

confidence: 85%

Accelerating the development of durum wheat adapted to drought and crown rot conditions

Alahmad¹

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Global demand for durum wheat (Triticum turgidum L. ssp. durum) will increase with our dramatic continuous growing population. However, production is facing climatic fluctuations and evolving pests and diseases. In Australia, the industry has encountered many challenges surrounding stable and profitable production. These include the lack of reliable rainfall throughout the production regions resulting in severe droughts, and the susceptibility of durum wheat to crown rot (CR; caused predominantly by Fusarium pseudograminearum). Damage to durum wheat crops caused by CR is exacerbated by water stress. Thus far, due to the limited protection attainable by fungicide application and lack of genetic resistance in elite durum breeding germplasm, it has been recognised that breeding varieties incorporating reduced susceptibility to CR would be the most effective control measure when effectively combined with other management practices. For example, improved root system architecture holds some promise for enhancing access to water in arid and semi-arid production areas, particularly in deep soils with high water-holding capacity. This may be advantageous in CR-affected environments if it enables improved access to water that could simultaneously help to avoid drought and so reduce the impact of CR on yield. Hence, this research aimed to identify and combine multiple desirable physiological traits, or adaptive features, to provide some tolerance to CR. Firstly, to identify genetic regions influencing root growth angle (RGA) and CR tolerance, an integrated screening method was developed for phenotyping root variation and CR tolerance, along with other important traits such as leaf rust and plant height in durum wheat. The method was adapted to speed breeding and provided plant breeders with protocols and tools to apply selection in early generations of population development. Therefore, the selection will result in enriching recombinant inbred lines (RILs) with desirable alleles and reduce the number of years required to combine these traits in elite breeding populations. Secondly, a nested association mapping (NAM) population was developed within 18 months using speed breeding technology, including an F4 generation in the field. NAM population were developed by crossing eight elite lines imported from the International Centre for Agricultural Research in the Dry Areas (ICARDA) with two Australian cultivars. This population generated a significant variation for above-and below-ground traits that could be harnessed and explored using genetic mapping and breeding approaches. To identify key genomic regions associated with RGA, a subset of 393 NAM lines were phenotyped using the 'clear pot' method. Combining RGA data with 2,541 polymorphic DArTseq markers information, a major iii independent QTL (qSRA-6A) on 6A chromosome was identified. Furthermore, haplotype analysis for this QTL identified two major haplotype groups in the population, highlighting the opportunity for combining root traits with above-ground traits to better ...

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Adult plant resistance to leaf rust and stem rust of wheat in a newly developed recombinant inbred line population

Cited by 5 publications

References 48 publications

Speed breeding for multiple quantitative traits in durum wheat

Speed breeding for multiple quantitative traits in durum wheat

QTL Mapping for Seedling and Adult Plant Resistance to Leaf and Stem Rusts in Pamyati Azieva × Paragon Mapping Population of Bread Wheat

Accelerating the development of durum wheat adapted to drought and crown rot conditions

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