Advances in Breeding for Abiotic Stress Tolerance in Wheat

Mondal, Suchismita; Sallam, Ahmed; Sehgal, Deepmala; Sukumaran, Sivakumar; Farhad,; Krishnan, J. Navaneetha; Kumar, Uttam; Biswal, Akshaya Kumar

doi:10.1007/978-3-030-75875-2_2

Cited by 32 publications

(24 citation statements)

References 197 publications

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“…In comparison to the previous marketing year, this was an improvement of over 30 million tonnes [1]. Due to the diverse genetic architecture and low heritability of wheat grain yield (GY), improving GY is one of the most difficult goals in wheat breeding, and improving GY is usually the most important breeding goal [2]. Wheat yield is considered to have three main components: spikes per unit area, kernel number per spike (KNS), and thousand kernel wheat (TKW).…”

Section: Introductionmentioning

confidence: 99%

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Genome-Wide Association Mapping Revealed SNP Alleles Associated with Spike Traits in Wheat

et al. 2022

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Wheat (Triticum aestivum L.) is one of the most important crops in the world. Four spike-related traits, namely, spike weight (SW), spike length (SL), the total number of spikelets per spike (TSNS), total kernels per spike (TKNS), and thousand-kernel weight (TKW), were evaluated in 270 F3:6 Nebraska winter wheat lines in two environments (Lincoln and North Platte, NE, USA). All genotypes in both locations exhibited high genetic variation for all yield traits. High positive correlations were observed among all yield-related traits in each location separately. No or low correlation in yield-related traits was observed between the two environments. The broad-sense heritability estimates were 72.6, 72.3, 71.2, 72.3, and 56.1% for SW, SL, TSNS, TKNS, and TKW, respectively. A genome-wide association study (GWAS) was used to identify SNPs associated with yield traits. In the Lincoln environment, 44 markers were found to be significantly associated with spike-related traits (SW, SL, TSNS, TKNS, and TKW), while 41 were detected in North Platte. Due to the strong significant genotype x environment, no common SNP markers were found between the two locations. Gene annotation of the significant markers revealed candidate genes encoded for important proteins that are associated directly or indirectly with yield traits. Such high genetic variation among genotypes is very useful for selection to improve yield traits in each location separately.

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Section: Introductionmentioning

confidence: 99%

“…Marker-assisted selection (MAS) is thought to be a crucial strategy for helping to break through the GY bottleneck and increase wheat GY potential [2]. The number and diversity of available alleles and closely related molecular markers determine the potential applications of MAS [6,7].…”

Section: Introductionmentioning

confidence: 99%

Genome-Wide Association Mapping Revealed SNP Alleles Associated with Spike Traits in Wheat

et al. 2022

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“…Thus, evaluating the plant physio-morphological traits is very important for selection to improve drought tolerance in a breeding program due to their relation to the adaption for future climate scenarios (Bowne et al, 2012). Physiological analyses provide helpful information on understanding the mechanisms in plants to alleviate the effect of drought stress (Sallam et al, 2018a;Dawood et al, 2020;Mondal et al, 2021;Moursi et al, 2021). Such information can be used along with morphological traits for selecting the most drought-tolerant cultivars with high adaptability to drought stress at the seedling stage.…”

Section: Introductionmentioning

confidence: 99%

Genetic and morpho-physiological analyses of the tolerance and recovery mechanisms in seedling stage spring wheat under drought stress

et al. 2022

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Drought is one of the complex abiotic stresses that affect the growth and production of wheat in arid and semiarid countries. In this study, a set of 172 diverse spring wheat genotypes from 20 different countries were assessed under drought stress at the seedling stage. Besides seedling length, two types of traits were recorded, namely: tolerance traits (days to wilting, leaf wilting, and the sum of leaf wilting), and recovery traits (days to regrowth, regrowth biomass, and drought survival rate). In addition, tolerance index, recovery index, and drought tolerance index (DTI) were estimated to select the most drought tolerant genotypes. Moreover, leaf protein content (P), amino acid (AM), proline content (PRO), glucose (G), fructose (F), and total soluble carbohydrates (TSC) were measured under control and drought conditions to study the changes in each physiological trait due to drought stress. All genotypes showed a high significant genetic variation in all the physio-morphological traits scored under drought stress. High phenotypic and genotypic correlations were found among all seedling morphological traits. Among the studied indices, the drought tolerance index (DTI) had the highest phenotypic and genotypic correlations with all tolerance and recovery traits. The broad-sense heritability (H2) estimates were high for morphological traits (83.85–92.27), while the physiological traits ranged from 96.41 to 98.68 under the control conditions and from 97.13 to 99.99 under drought stress. The averages of the physiological traits (proteins, amino acids, proline, glucose, fructose, and total soluble carbohydrates) denoted under drought stress were higher than those recorded under well-watered conditions except for proteins. In this regard, amino acids, glucose, and total soluble carbohydrates had a significant correlation with all morphological traits. The selection for drought tolerance revealed 10 tolerant genotypes from different countries (8 genotypes from Egypt, one from Morocco, and one from the United States). These selected genotypes were screened for the presence of nine specific TaDREB1 alleles. Six primers were polymorphic among the selected genotypes. Genetic diversity among the selected genotypes was investigated using 21,450 SNP markers. The results of the study shed light on the different mechanisms for drought tolerance that wheat plants use to tolerate and survive under drought stress. The genetic analysis performed in this study suggested the most suitable genotypes for selective breeding at the seedling stage under water deficit.

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“…Genetic variation in chlorophyll content, canopy temperature, and specific leaf area under normal and salinity conditions Improving salt tolerance is a great challenge as it is a very complex trait that is under polygenic control. More study is required on more morphological and physiological traits to Frontiers in Genetics frontiersin.org understand the complexity of salt tolerance Moursi et al, 2020;Mondal et al, 2021;Thabet et al, 2021). The high genetic variation existing among genotypes in the three traits was extremely useful for plant breeders in selecting genotypes with increased CC_S and decreased CT_S in the current study.…”

Section: Discussionmentioning

confidence: 96%

Association mapping and candidate genes for physiological non-destructive traits: Chlorophyll content, canopy temperature, and specific leaf area under normal and saline conditions in wheat

Said

Moursi²,

Sallam³

2022

Front. Genet.

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Wheat plants experience substantial physiological adaptation when exposed to salt stress. Identifying such physiological mechanisms and their genetic control is especially important to improve its salt tolerance. In this study, leaf chlorophyll content (CC), leaf canopy temperature (CT), and specific leaf area (SLA) were scored in a set of 153 (103 having the best genotypic data were used for GWAS analysis) highly diverse wheat genotypes under control and salt stress. On average, CC and SLA decreased under salt stress, while the CT average was higher under salt stress compared to the control. CT was negatively and significantly correlated with CC under both conditions, while no correlation was found between SLA and CC and CT together. High genetic variation and broad-sense-heritability estimates were found among genotypes for all traits. The genome wide association study revealed important QTLs for CC under both conditions (10) and SLA under salt stress (four). These QTLs were located on chromosomes 1B, 2B, 2D, 3A, 3B, 5A, 5B, and 7B. All QTLs detected in this study had major effects with R2 extending from 20.20% to 30.90%. The analysis of gene annotation revealed three important candidate genes (TraesCS5A02G355900, TraesCS1B02G479100, and TraesCS2D02G509500). These genes are found to be involved in the response to salt stress in wheat with high expression levels under salt stress compared to control based on mining in data bases.

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Advances in Breeding for Abiotic Stress Tolerance in Wheat

Cited by 32 publications

References 197 publications

Genome-Wide Association Mapping Revealed SNP Alleles Associated with Spike Traits in Wheat

Genome-Wide Association Mapping Revealed SNP Alleles Associated with Spike Traits in Wheat

Genetic and morpho-physiological analyses of the tolerance and recovery mechanisms in seedling stage spring wheat under drought stress

Association mapping and candidate genes for physiological non-destructive traits: Chlorophyll content, canopy temperature, and specific leaf area under normal and saline conditions in wheat

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