&lt;b&gt;Identification of QTL underlying agronomic, morphological and physiological traits in barley under rainfed conditions using SNP markers

Arriagada, Osvin; Mora, Freddy; Quitral, Yerko; Pozo, Alejandro del

doi:10.4025/actasciagron.v39i3.32612

Cited by 11 publications

(8 citation statements)

References 40 publications

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“…They detected trait-reducing effects in the same chromosomal region on 7H where the effects in this study were mapped. QTL effects on 2H, 4H, and 7H were also detected by Arriagada et al [ 42 ] and Mora at al. [ 43 ].…”

Section: Discussionsupporting

confidence: 72%

“…They detected QTL for biomass yield on chromosomes 2H and 6H. Arriagada et al [ 42 ] and Mora et al [ 43 ] tested 137 barley recombinant chromosome substitution lines, derived from a cross between wild barley accession Caeserea 26–24 and malting barley Harrington, in Mediterranean environments in Chile under rain fed conditions. They detected QTL for biomass on 2H, 5H, and 7H.…”

Section: Discussionmentioning

confidence: 99%

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QTL controlling grain filling under terminal drought stress in a set of wild barley introgression lines

Honsdorf¹,

March²,

Pillen³

2017

PLoS ONE

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Drought is a major abiotic stress impeding the yield of cereal crops globally. Particularly in Mediterranean environments, water becomes a limiting factor during the reproductive developmental stage, causing yield losses. The wild progenitor of cultivated barley Hordeum vulgare ssp spontaneum (Hsp) is a potentially useful source of drought tolerance alleles. Wild barley introgression lines like the S42IL library may facilitate the introduction of favorable exotic alleles into breeding material. The complete set of 83 S42ILs was genotyped with the barley 9k iSelect platform in order to complete genetic information obtained in previous studies. The new map comprises 2,487 SNPs, spanning 989.8 cM and covering 94.5% of the Hsp genome. Extent and positions of introgressions were confirmed and new information for ten additional S42ILs was collected. A subset of 49 S42ILs was evaluated for drought response in four greenhouse experiments. Plants were grown under well-watered conditions until ten days post anthesis. Subsequently drought treatment was applied by reducing the available water. Several morphological and harvest parameters were evaluated. Under drought treatment, trait performance was reduced. However, there was no interaction effect between genotype and treatment, indicating that genotypes, which performed best under control treatment, also performed best under drought treatment. In total, 40 QTL for seven traits were detected in this study. For instance, favorable Hsp effects were found for thousand grain weight (TGW) and number of grains per ear under drought stress. In particular, line S42IL-121 is a promising candidate for breeding improved malting cultivars, displaying a TGW, which was increased by 17% under terminal drought stress due to the presence of an unknown wild barley QTL allele on chromosome 4H. The introgression line showed a similar advantage in previous field experiments and in greenhouse experiments under early drought stress. We, thus, recommend using S42IL-121 in barley breeding programs to enhance terminal drought tolerance.

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Section: Discussionsupporting

confidence: 72%

Section: Discussionmentioning

confidence: 99%

QTL controlling grain filling under terminal drought stress in a set of wild barley introgression lines

Honsdorf¹,

March²,

Pillen³

2017

PLoS ONE

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“…In fact, the negative effects of drought could be overcome by the identification and use of drought-tolerant varieties (Van Oosten et al, 2016). Given this solution, the dissection of molecular mechanisms that underlie adaptive traits represents one approach to understanding stress tolerance in plants (Budak et al, 2015;Liu et al, 2017;Arriagada et al, 2017). For example, Merchuk-Ovnat et al (2016) showed that the introgression of QTLs on chromosomes 1B and 2B of T. turgidum into T. aestivum can enhance drought tolerance in domesticated wheat.…”

Section: Introductionmentioning

confidence: 99%

Association mapping of drought tolerance indices in wheat: QTL-rich regions on chromosome 4A

Ballesta

Mora

Pozo

2020

Sci. agric. (Piracicaba, Braz.)

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Drought is likely the main abiotic stress that affects wheat yield. The identification of drought-tolerant genotypes represents an effective way of dealing with the continuous decrease in water resources as well as the increase in world population. The aim of this study was to identify single nucleotide polymorphisms (SNP) associated with drought tolerance indices in wheat by using a genome-wide association study (GWAS) under fully irrigated and rain-fed conditions. The drought tolerance indices (i.e., Stress Susceptibility Index, Stress Tolerance Index, Tolerance Index and Yield Stability Index) were calculated based on grain yield, 1,000-kernel weight and kernels per spike. The association panel was genotyped using genotyping-bysequencing (GBS). A total of 175 SNPs exhibited statistical evidence of association with at least one drought tolerance index, explaining up to 6 % of the phenotypic variation. Forty-five SNPs were associated with more than one tolerance index (up to 4 agronomic traits). Most associations were located on chromosome 4A, supporting the hypothesis that this chromosome has a key role in drought tolerance which should be exploited for wheat improvement. In addition, statistical analysis detected SNPs associated with tolerance indices in both growing seasons, providing information about genetic regions with stable effects under different environmental conditions. This GWAS experiment serves as one of the few studies on association mapping for drought tolerance indices in wheat, which could increase the efficiency of rain-fed and irrigated crop production.

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Section: Flag Leaf Width (Flw)mentioning

confidence: 99%

“…In order to sustain normal growth in drought condition, the plant increase water use efficiency (Liu et al, 2015;Arriagada et al, 2017). Plant water status affects photosynthesis process, plant growth, development, and yield (Arriagada et al, 2017). One of the important criteria has been widely used to explain plant water status in barley is flag leaf RWC (Liu et al, 2015;Forster et al, 2004).…”

Section: Flag Leaf Width (Flw)mentioning

confidence: 99%

Association Mapping of Morphological and Physiological Traits of Flag Leaf Related to Drought Tolerance in Barley

Jabbari¹,

Fakheri

Aghnoum

et al. 2019

Rev. Agric. Neotrop.

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Association mapping (AM) has proven to be a powerful approach for dissecting the genetic basis of complex traits. In this study, Quantitative Trait Loci (QTLs) controlling flag leaf characteristics under drought stress were detected in a set of 148 modern spring barley cultivars using AM analysis. Flag leaf length (FLL), flag leaf width (FLW), relative water content (RWC), chlorophyll content, and maximum quantum efficiency of PSII (Fv/Fm) which are important in photosynthetic rate, were evaluated under normal irrigation and drought stress conditions at grain filling stage. Population structure was estimated using Structure 2.3 and linkage disequilibrium (LD) was estimated by the 'Full Matrix LD' using Tassel 5.0. Significant marker/trait associations were investigated based on K-Q matrix using Tassel 3.0. The analysis of population structure divided the cultivars into two subgroups. Significant LD values (P < 0.01) between polymorphic sites with regions of high and low LD were observed. A total of 84 significant putative genomic regions were identified, which delineated into 37 QTLs under two water treatments. Two stable QTLs on 2H and 3H were detected for FLL in drought stress treatment. A QTL for FLL were detected on 2H in normal treatment, which alone explained around 11% of phenotypic variance of FLL. This QTL was also associated with the expression of FLW and explained around 7.5% of phenotypic variance. The results suggest that major loci are located on chromosomes 2H, 3H, 4H and 5H involved in the development of flag leaf characteristics and could be used as selection criteria in barley breeding for drought tolerance.

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<b>Identification of QTL underlying agronomic, morphological and physiological traits in barley under rainfed conditions using SNP markers

Cited by 11 publications

References 40 publications

QTL controlling grain filling under terminal drought stress in a set of wild barley introgression lines

QTL controlling grain filling under terminal drought stress in a set of wild barley introgression lines

Association mapping of drought tolerance indices in wheat: QTL-rich regions on chromosome 4A

Association Mapping of Morphological and Physiological Traits of Flag Leaf Related to Drought Tolerance in Barley

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