Phenotyping approaches for physiological breeding and gene discovery in wheat

Reynolds, M.P.; Manès, Yann; Izanloo, Ali; Langridge, Peter

doi:10.1111/j.1744-7348.2009.00351.x

Cited by 214 publications

(139 citation statements)

References 41 publications

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“…Phenotypic correlation coefficients, therefore, are limited in their capacity to accurately reflect dependencies based on common genetic factors such as regulatory genes, especially under environmental conditions that affect multiple traits simultaneously. This may be particularly true under stress conditions, given that the genetic component of the overall stress response is usually small relative to the environmental component (Reynolds et al, 2009).…”

Section: Correlated Responsesmentioning

confidence: 99%

Whole-Genome Mapping of Agronomic and Metabolic Traits to Identify Novel Quantitative Trait Loci in Bread Wheat Grown in a Water-Limited Environment

Hill

Taylor

Edwards³

et al. 2013

PLANT PHYSIOLOGY

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107

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Drought is a major environmental constraint responsible for grain yield losses of bread wheat (Triticum aestivum) in many parts of the world. Progress in breeding to improve complex multigene traits, such as drought stress tolerance, has been limited by high sensitivity to environmental factors, low trait heritability, and the complexity and size of the hexaploid wheat genome. In order to obtain further insight into genetic factors that affect yield under drought, we measured the abundance of 205 metabolites in flag leaf tissue sampled from plants of 179 cv Excalibur/Kukri F1-derived doubled haploid lines of wheat grown in a field experiment that experienced terminal drought stress. Additionally, data on 29 agronomic traits that had been assessed in the same field experiment were used. A linear mixed model was used to partition and account for nongenetic and genetic sources of variation, and quantitative trait locus analysis was used to estimate the genomic positions and effects of individual quantitative trait loci. Comparison of the agronomic and metabolic trait variation uncovered novel correlations between some agronomic traits and the levels of certain primary metabolites, including metabolites with either positive or negative associations with plant maturity-related or grain yield-related traits. Our analyses demonstrate that specific regions of the wheat genome that affect agronomic traits also have distinct effects on specific combinations of metabolites. This approach proved valuable for identifying novel biomarkers for the performance of wheat under drought and could facilitate the identification of candidate genes involved in drought-related responses in bread wheat.

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Section: Correlated Responsesmentioning

confidence: 99%

Whole-Genome Mapping of Agronomic and Metabolic Traits to Identify Novel Quantitative Trait Loci in Bread Wheat Grown in a Water-Limited Environment

Hill

Taylor

Edwards³

et al. 2013

PLANT PHYSIOLOGY

Self Cite

107

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“…Increased understanding of the genetic basis for adaptation to heat and drought stress (Pinto et al 2010) will impact on breeding in two distinct ways; by increasing the efficiency of plant selection and by providing new opportunities for exploration of genetic resources (Reynolds et al 2009). In this context, a significant advantage of wheat's hexaploid genome is that there is ample scope to broaden its adaptive potential by introducing genes from wild relatives through breeding (Trethowan and Mujeeb-Kazi 2008).…”

Section: Breeding For Improved Yield and Reduced Risksmentioning

confidence: 99%

Crops that feed the world 10. Past successes and future challenges to the role played by wheat in global food security

et al. 2013

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Wheat is fundamental to human civilization and has played an outstanding role in feeding a hungry world and improving global food security. The crop contributes about 20 % of the total dietary calories and proteins worldwide. Food demand in the developing regions is growing by 1 % annually and varies from 170 kg in Central Asia to 27 kg in East and South Africa. The developing regions (including China and Central Asia) account for roughly 53 % of the total harvested area and 50 % of the production. Unprecedented productivity growth from the Green Revolution (GR) since the 1960s dramatically transformed world wheat production, benefitting both producers and consumers through low production costs and low food prices. Modern wheat varieties were adopted more rapidly than any other technological innovation in the history of agriculture, recently reaching about 90 % of the area in developing regions. One of the key challenges today is to replace these varieties with new ones for better sustainability. While the GR "spared" essential ecosystems from conversion to agriculture, it also generated its own environmental problems. Also productivity increase is now slow or static. Achieving the productivity gains needed to ensure food security will therefore require more than a repeat performance of the GR of the past. Future demand will need to be achieved through sustainable intensification that combines better crop resistance to diseases and pests, adaptation to warmer climates, and reduced use of water, fertilizer, labor and fuel. Meeting these challenges will require concerted efforts in research and innovation to develop and deploy viable solutions. Substantive investment will be required to realize sustainable productivity growth through better technologies and policy and institutional innovations that facilitate farmer adoption and adaptation. The enduring lessons from the GR and the recent efforts for sustainable intensification of cereal systems in South Asia and other regions provide useful insights for the future.

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“…Additionally, alx8 demonstrates the complexity of ABA-dependent and ABA-independent transcriptional networks, as some components in both pathways are up-regulated in alx8. This study provides evidence for common steps in bothe the drought and high light (HL) stress response pathways (Rossel et al, 2006;Reynolds et al, 2009;Richards et al, 2010). Xu et al, (2006) used a microarray to identify genes related to drought resistance and TE in wheat.…”

Section: Wue-related Gene Cloning and Identificationmentioning

confidence: 99%

Advances and prospects: Biotechnologically improving crop water use efficiency

Zhengbin

Shao³

et al. 2011

Critical Reviews in Biotechnology

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Bio-water saving can be defined as the reduction of crop water consumption employing biological measures. This is the focus of efforts to save water in agriculture. Different levels of water-use efficiency (WUE) have been developed. The genetic diversity of WUE has been confirmed in several crops. WUE is the basis of bio-watering and physiological WUE is the key. The degree to develop physiological WUE potential decides the performance of bio-watering in the field. During this process, fine management is important. Thus bio-watering is closely related to WUE. Crop WUE has improved and evolved as a result of breeding programs. Many WUE genes have been located in different genomic and aneuploid materials and have been mapped by various molecular markers in a number of crops. Two genes, (Erecta and alx8), which control water use efficiency; have been cloned in Arabidopsis thaliana. Eleven WUE genes have been identified by microarray analysis. Six genes associated with drought resistance and photosynthesis have been transfered into crops which have resulted in improving WUE and drought resistance. WUE is important on the basis of functional identification of more drought resistant gene resources. The popularity on the industrial-scale of transgenic plants is still in its infancy and one of the reasons for this is the lack of knowledge regarding molecular mechanisms and it is a very immature technology. Enhanced agricultural practices and the theoretical aspects of improving crop WUE have been developed and are discussed in this review paper. Rapid progress will be made in biowater savings and that crop WUE can be substantially improved under both favorable and unfavorable water-limited environments. This will be achieved by a combination of traditional breeding techniques and the introduction of modern biotechnology

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Phenotyping approaches for physiological breeding and gene discovery in wheat

Cited by 214 publications

References 41 publications

Whole-Genome Mapping of Agronomic and Metabolic Traits to Identify Novel Quantitative Trait Loci in Bread Wheat Grown in a Water-Limited Environment

Whole-Genome Mapping of Agronomic and Metabolic Traits to Identify Novel Quantitative Trait Loci in Bread Wheat Grown in a Water-Limited Environment

Crops that feed the world 10. Past successes and future challenges to the role played by wheat in global food security

Advances and prospects: Biotechnologically improving crop water use efficiency

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