Variability of Root Traits in Spring Wheat Germplasm

Narayanan, Sruthi; Mohan, Amita; Gill, Kulvinder S.; Prasad, P. V. Vara

doi:10.1371/journal.pone.0100317

Cited by 115 publications

(81 citation statements)

References 42 publications

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“…There are a lot of reports that advocate the patterning of root under stress conditions (Chloupek et al, 2010; Naz et al, 2012; Narayanan et al, 2014). To find genetic component behind this novel adaptation under drought, we searched candidate genes in the targeted QTL region using Genome Zipper of barley (Mayer et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Genome-Wide Association Mapping in the Global Diversity Set Reveals New QTL Controlling Root System and Related Shoot Variation in Barley

et al. 2016

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The fibrous root system is a visible sign of ecological adaptation among barley natural populations. In the present study, we utilized rich barley diversity to dissect the genetic basis of root system variation and its link with shoot attributes under well-water and drought conditions. Genome-wide association mapping of phenotype data using a dense genetic map (5892 SNP markers) revealed 17 putative QTL for root and shoot traits. Among these, at 14 loci the preeminence of exotic QTL alleles resulted in trait improvements. The most promising QTL were quantified using haplotype analysis at local and global genome levels. The strongest QTL was found on chromosome 1H which accounted for root dry weight and tiller number simultaneously. Candidate gene analysis across the targeted region detected a crucial amino acid substitution mutation in the conserved domain of a WRKY29 transcription factor among genotypes bearing major and minor QTL alleles. Similarly, the drought inducible QTL QRdw.5H (5H, 95.0 cM) seems to underlie 37 amino acid deletion and substitution mutations in the conserved domain of two related genes CBF10B and CBF10A, respectively. The identification and further characterization of these candidate genes will be essential to decipher genetics behind developmental and natural adaptation mechanisms of barley.

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Section: Discussionmentioning

confidence: 99%

Genome-Wide Association Mapping in the Global Diversity Set Reveals New QTL Controlling Root System and Related Shoot Variation in Barley

et al. 2016

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“…For maximum grain yield in wheat, active and well-developed root system is necessary [36,37]. Table 2.…”

Section: Root Trait Analysis and Its Signiicance To Droughtmentioning

confidence: 99%

Association Mapping of Root Traits for Drought Tolerance in Bread Wheat

Ahmad¹

2017

Wheat Improvement, Management and Utilization

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Bread wheat (Triticum aestivum L., 2n = 6x = 42, AABBDD) is one of the most important crops, making staple food for more than 40 countries and over 35% of the global population. Drought stress is among the major constraints to wheat production as it afects plant growth, gene expression and yield potential of the crop. Development of elite wheat cultivars with the ability to grow and reproduce in water-limited soils seems to be the most enduring solution of addressing drought stress. A total of 100 lines including well-adapted wheat cultivars were evaluated for important root traits and complemented with 102 PCR-based markers aiming to understand their genetic structure and to identify molecular markers that are closely associated to quantitative trait loci (QTLs) of important root traits. Alleles per locus are counted and polymorphic information content (PIC) values are calculated. Population structure of these lines was analyzed with general linear model (GLM) and mixed linear model (MLM) approaches for identiication of QTLs associated with important root traits. The results indicated the presence of two novel QTLs on the homoeologous group 2 and group 5 of wheat that may be related to drought stress resistance. Our results may facilitate the development of agronomically desirable drought stress-resistant wheat germplasm.

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“…Deeper and profuse roots were found to increase plant access to water from deeper layers of the soil and support greater crop growth under water stress condition (Mir et al 2012;Narayanan et al 2014). The root system is complex and comprises traits such as root volume, root length, root penetration, root thickness and root/shoot ratio which are controlled by many genes and have generally been considered to be contributors to DR (Qu et al 2008).…”

Section: Root Traitsmentioning

confidence: 99%

Drought Resistance in Crops: Physiological and Genetic Basis of Traits for Crop Productivity

Khanna‐Chopra

Singh

2015

Stress Responses in Plants

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Drought is the most important environmental stress affecting agricultural productivity worldwide. Breeding of drought-tolerant crops is important in order to meet demands of food security in the face of an ever increasing world population, global warming and water shortage. Drought resistance (DR) is defined as the mechanism causing minimum loss of yield in a water deficit environment relative to the maximum yield in a water constraint free management of the crop. Plants have evolved several mechanisms to cope with water deficit stress which includes drought escape and drought tolerance. Plant breeders and physiologists have identified some important traits associated with DR in crop plants. Many of these traits relate to making appropriate use of water when it is available, often with the aim of ensuring reproductive success and grain yield. Traits associated with DR serve as important breeding tools in identifying stress-resistant genotypes and in introgressing the resistance traits into high yielding genotypes. Marker-assisted selection based around screening for desirable alleles at QTL for DR is an important approach for improving DR in crops. Dissecting these complex phenotypic traits into simpler heritable traits has led to the identification of genes associated with some QTLs for DR. Breeding for DR has met with limited success following either empirical or marker-assisted selection approach. It is essential to integrate crop physiology, functional genomics and breeding approaches to dissect complex DR traits, understand the molecular basis of DR and develop improved cultivars to adapt to the changing climate. This chapter focuses on the DR traits important for agricultural productivity in major crops, i.e. wheat and rice. The physiological and genetic basis of traits is discussed to highlight the complexity of the quantitative traits and the need to integrate this information in breeding drought-resistant crops.

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Variability of Root Traits in Spring Wheat Germplasm

Cited by 115 publications

References 42 publications

Genome-Wide Association Mapping in the Global Diversity Set Reveals New QTL Controlling Root System and Related Shoot Variation in Barley

Genome-Wide Association Mapping in the Global Diversity Set Reveals New QTL Controlling Root System and Related Shoot Variation in Barley

Association Mapping of Root Traits for Drought Tolerance in Bread Wheat

Drought Resistance in Crops: Physiological and Genetic Basis of Traits for Crop Productivity

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