Performance of LS97-1610×‘Spencer’ soybean recombinant inbred line population segregating for resistance to<i>Fusarium virguliforme</i>

Clark, W.; Reyes-Valdés, M. H.; Bond, Jason P.; Kantartzi, Stella K.

doi:10.4141/cjps2013-079

Cited by 3 publications

(2 citation statements)

References 30 publications

(29 reference statements)

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“…The parental lines were chosen for their significantly different reaction to SDS. LS90-1920 was released and registered for its resistance to SDS [12] while Spencer is used as susceptible check to most SDS experiments [17].…”

Section: Discussionmentioning

confidence: 99%

Relationship of Resistance to Sudden Death Syndrome with Yield and other Important Agronomic Traits in a Recombinant Inbred Soybean Population

Anderson¹,

Clark²,

Reyes-Valdés

et al. 2015

JPS

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The objective of this study was to evaluate a recombinant inbred line population derived from a cross between a recombinant inbred line (RIL) resistant to sudden death syndrome (SDS). 'LS90-1920' with a susceptible line, 'Spencer' in order to identify any significant association between yield and important agronomic traits with SDS, estimate heritability of these traits and determine whether there are traits that can be used as predictors for SDS resistance. Correlation coefficients for yield and agronomic traits (maturity, lodging, and plant height) were moderately to highly significant but there was no significant association between these traits and SDS resistance. Genotype by environment interaction was significant for all traits studied except of plant height. Maturity, lodging, plant height and SDS resistance were moderately to highly heritable whereas yield showed very low heritability. Our findings showed that environment plays a very crucial role in selection. It is showed that genotypic selection can speed up but cannot replace phenotypic selection across environments and time. Environment is important for the development and production of crop plants because it optimizes the association between the genotype and the phenotype. Highlights: Created Recombinant Inbred Line; Tested for agronomic traits including yield; Tested for disease resistance; Analyzed results to determine if Recombinant Inbred Line differed from the parental lines; Determined if traits were inherited from parents.

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Section: Discussionmentioning

confidence: 99%

Relationship of Resistance to Sudden Death Syndrome with Yield and other Important Agronomic Traits in a Recombinant Inbred Soybean Population

Anderson¹,

Clark²,

Reyes-Valdés

et al. 2015

JPS

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“…It has already become a very important disease in highest yield U.S. environments. Releases of germplasm with improved genetic resistance based on a clear understanding of the mechanisms behind resistance will be key to reduce soybean losses to SDS (Gibson et al, 1994;Iqbal et al, 2001;Njiti et al, 2002;Lightfoot et al, 2005;Lightfoot, 2008;Kazi et al, 2008;Luckew et al, 2013;Clark et al, 2013;Anderson et al, 2014;Cianzio et al, 2014). However, advances by breeding in resistance to SDS have been sporadic due to the patchy nature of disease outbreaks, the difficulty of pyramiding large numbers of alleles (6-10 among the 18-30 identified).…”

Section: Two Decades Of Molecular Marker-assisted Breeding For Resistmentioning

confidence: 99%

Two Decades of Molecular Marker‐Assisted Breeding for Resistance to Soybean Sudden Death Syndrome

Lightfoot

2015

Crop Science

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Novel tools to improve resistance to sudden death syndrome (SDS) and the underlying Fusarium root rot (FRR) caused by Fusarium virguliforme (Aoki) have been developed for soybean [Glycine max (L.) Merr.]. Eighteen resistance loci have been identified and confirmed over the past two decades (named Rfs1 to Rfs18). To select the beneficial alleles of 8 to 10 loci per cross needed for optimal resistance is a difficult task for plant breeders. Resistance mechanisms to FRR provide only partial protection. Crops contend with many Fusaria, a group with a wide host range and flexible hemibiotrophic lifestyle. Full resistance is absent among the leguminacea, brassicacea, cucurbitacea, and solanacea. This review focuses on the use of plant genomics resources to aid breeding selection for resistance to SDS. The SDS is a combination of two diseases. The first includes rotted roots and toxin‐restricted root development. Resistances include variations in infection severity, infection frequency, and rot severity. The second is caused by toxins translocated from infected roots to the shoots. Leaf scorch, supra‐petiolar abscission, pod abortion and early plant maturity are consequences of many toxin to target interactions. Breeding for combined FRR and SDS resistance has begun using a set of exciting new tools for pathogen quantification in roots. Resistance genes were proven, including GmRLK18‐1 (Glyma_18_02680) Rfs2, and MIPs1a (EC 5.5.1.4) Rfs3. The new tools provide an opportunity for new breeding initiatives. This review aims to inform these new programs of the core discoveries from the past 20 yr, to incorporate best practices from old and new initiatives.

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Temporal Dynamics of Fusarium virguliforme Colonization of Soybean Roots

et al. 2019

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Soybean sudden death syndrome (SDS) caused by Fusarium virguliforme is one of the most yield limiting soybean diseases in the United States. SDS disease symptoms include root rot and foliar symptoms induced by fungal toxins. Soybean cultivar resistance is one of the most effective SDS disease management options, but no cultivar displays complete resistance. Soybean SDS foliar symptoms are the primary phenotype used to screen and breed for SDS resistance. Root rot or root colonization measures are seldom utilized, partly due to the lack of convenient and accurate methods for quantification of F. virguliforme. In this study, greenhouse and field experiments were conducted to determine the temporal dynamics of F. virguliforme colonization of soybean roots using quantitative real-time PCR (qPCR). The infection coefficient (IC), or ratio of F. virguliforme DNA to soybean DNA, was determined in soybean cultivars with different SDS foliar resistance ratings. In greenhouse experiments, F. virguliforme was detected in all cultivars 7 days after planting (DAP), with a peak in IC at 14 DAP. All soybean cultivars developed SDS foliar symptoms, but F. virguliforme soybean root colonization levels did not significantly correlate with SDS foliar symptom severity. In field experiments, SDS foliar symptoms developed among soybean cultivars in alignment with provided foliar resistance ratings; however, the F. virguliforme IC were not significantly different between SDS foliar symptomatic and asymptomatic cultivars. F. virguliforme was detected in all cultivars at the first sample collection point 25 DAP (V3 vegetative growth stage), and the IC increased throughout the season, peaking at the last sample collection point 153 DAP (postharvest). Collectively, appearance and disease severity ratings of SDS foliar symptoms were not associated with F. virguliforme quantity in roots, suggesting a need to include F. virguliforme root colonization in breeding efforts to screen soybean germplasm for F. virguliforme root infection resistance. The findings also demonstrates root colonization of the pathogen on nonsymptomatic soybean cultivars leading to persistence of the pathogen in the field, and possible hidden yield loss.

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Performance of LS97-1610×‘Spencer’ soybean recombinant inbred line population segregating for resistance toFusarium virguliforme

Cited by 3 publications

References 30 publications

Relationship of Resistance to Sudden Death Syndrome with Yield and other Important Agronomic Traits in a Recombinant Inbred Soybean Population

Relationship of Resistance to Sudden Death Syndrome with Yield and other Important Agronomic Traits in a Recombinant Inbred Soybean Population

Two Decades of Molecular Marker‐Assisted Breeding for Resistance to Soybean Sudden Death Syndrome

Temporal Dynamics of Fusarium virguliforme Colonization of Soybean Roots

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