Variability and selection among mutant families of wheat for biomass allocation, yield and yield‐related traits under drought‐stressed and non‐stressed conditions

OlaOlorun, Boluwatife M.; Shimelis, Hussein; Mathew, Isack

doi:10.1111/jac.12459

Cited by 10 publications

(9 citation statements)

References 83 publications

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“…This study shows that early maturation, small plant size, and reduced leaf area, are all expected to decrease plant photosynthetic activity, and were associated with drought tolerance. We found a reduction of GPC under D, a decrease in the quality and quantity of grains under water stress is associated with the impaired development of the reproductive organ [62,63]. Increasing the number of grains contributes to wheat yield potential under a limited water supply [64] and [14].…”

Section: Discussionmentioning

confidence: 75%

Genome-Wide Association Study in Bread Wheat Identifies Genomic Regions Associated with Grain Yield and Quality under Contrasting Water Availability

Govta

Polda

Sela

et al. 2022

IJMS

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The objectives of this study were to identify genetic loci in the bread wheat genome that would influence yield stability and quality under water stress, and to identify accessions that can be recommended for cultivation in dry and hot regions. We performed a genome-wide association study (GWAS) using a panel of 232 wheat accessions spanning diverse ecogeographic regions. Plants were evaluated in the Israeli Northern Negev, under two environments: water-limited (D; 250 mm) and well-watered (W; 450 mm) conditions; they were genotyped with ~71,500 SNPs derived from exome capture sequencing. Of the 14 phenotypic traits evaluated, 12 had significantly lower values under D compared to W conditions, while the values for two traits were higher under D. High heritability (H2 = 0.5–0.9) was observed for grain yield, spike weight, number of grains per spike, peduncle length, and plant height. Days to heading and grain yield could be partitioned based on accession origins. GWAS identified 154 marker-trait associations (MTAs) for yield and quality-related traits, 82 under D and 72 under W, and identified potential candidate genes. We identified 24 accessions showing high and/or stable yields under D conditions that can be recommended for cultivation in regions under the threat of global climate change.

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Section: Discussionmentioning

confidence: 75%

Genome-Wide Association Study in Bread Wheat Identifies Genomic Regions Associated with Grain Yield and Quality under Contrasting Water Availability

Govta

Polda

Sela

et al. 2022

IJMS

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“…The root system is a vital part of a plant providing anchorage and support, access and mobilization of water and nutrients and soil carbon sequestration for plant growth and development [6]. However, breeding under intensive agronomic management and high input production systems has progressively led to weaker root systems in modern wheat cultivars [7,8]. As a result, most modern wheat varieties are highly susceptible to moisture stress, and their weak root system has limited agility to environmental adaptation and access to soil moisture and nutrients [9].…”

Section: Introductionmentioning

confidence: 99%

Comparative Genetic Diversity Analysis for Biomass Allocation and Drought Tolerance in Wheat

et al. 2022

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Genetic diversity is invaluable in developing climate-smart and drought-adapted wheat varieties. The aim of this study was to determine the extent of genetic variation present in wheat germplasm collections for biomass allocation and drought tolerance based on complementary phenotypic and root attributes and high-density single nucleotide polymorphism (SNP) markers to select breeding parents. A total of 97 bread wheat (Triticum aestivum L.) genotypes were evaluated in field and greenhouse trials under drought-stressed and non-stressed conditions. The molecular variance analysis showed that the intrapopulation variance was very high at 99%, with a small minimal inter-population variance (1%). The genetic distance, polymorphic information content and expected heterozygosity were 0.20–0.88, 0.24–1.00 and 0.29–0.58, respectively. The cluster analysis based on SNP data showed that 44% and 28% of the assessed genotypes maintained their genetic groups when compared to hierarchical clusters under drought-stressed and non-stressed phenotypic data, respectively. The joint analysis using genotypic and phenotypic data resolved three heterotic groups and allowed the selection of genotypes BW140, BW152, BW157, BW162, LM30, LM47, LM48, LM52, LM54 and LM70. The selected genotypes were the most genetically divergent with high root biomass and grain yield and are recommended for production or breeding.

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“…Mutation breeding techniques using ethyl methanesulfonate (EMS) for plant improvement purposes are not new to the scientific world and have been studied intensively, especially in essential crops species, such as rice [11][12][13] and wheat 14,15 . The key goal of mutation-based breeding is to cultivate and refine well-adapted plant varieties by changing some significant traits to maximise their production and yield 16 .…”

Section: Introductionmentioning

confidence: 99%

Mutagenic Effects of Ethyl Methanesulfonate on Morphological and Growth Characteristics of Neolamarckia cadamba Plantlets

Dalin¹,

Ho²,

Ling³

2022

Asian J. of Plant Sciences

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Background and Objective: Neolamarckia cadamba (Roxb.) Bosser is an economically important timber species used for light construction due to its light hardwood characteristic. Ethyl methanesulfonate (EMS) is a widely used chemical mutagen in plants as it gives a high frequency of point mutations. Hence, this study aimed to determine the lethal concentration 50 (LC 50 ) of EMS and the mutagenic effects of EMS on growth characteristics and morphological variations of N. cadamba derived from nodal explants. Materials and Methods: Seeds derived from the candidate plus tree N5 were germinated in vitro. The nodal explants excised from the plantlets were used as the material for in vitro mutagenesis with different concentrations of EMS (0.1, 0.3, 0.6 and 1%) and durations (1, 2, 3 and 4 hrs). Results: The findings showed that the survival percentage was significantly reduced as both EMS concentration and treatment duration increased. The LC 50 was 1.3% for 2 hrs, 0.4% for 3 hrs and 0.3% for 4 hrs. Various responses were observed in the EMS-treated explants. These include reduced and slower shoot induction, reduced number of shoot formations, reduced callus formation and lower plant height. Morphological abnormalities were also identified among the survived explants, such as unifoliate orbicular leaves, pointy leaves, small apical leaves, stunted shoot growth and distorted shoot formation. Conclusion: The present findings show that nodal explants can be used for in vitro EMS mutagenesis besides seeds as the most widely used material for mutation study. The putative mutants derived from this study could be used for future breeding and genomics research of N. cadamba.

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Variability and selection among mutant families of wheat for biomass allocation, yield and yield‐related traits under drought‐stressed and non‐stressed conditions

Cited by 10 publications

References 83 publications

Genome-Wide Association Study in Bread Wheat Identifies Genomic Regions Associated with Grain Yield and Quality under Contrasting Water Availability

Genome-Wide Association Study in Bread Wheat Identifies Genomic Regions Associated with Grain Yield and Quality under Contrasting Water Availability

Comparative Genetic Diversity Analysis for Biomass Allocation and Drought Tolerance in Wheat

Mutagenic Effects of Ethyl Methanesulfonate on Morphological and Growth Characteristics of Neolamarckia cadamba Plantlets

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