Haploid Production Technology: Fasten Wheat Breeding to Meet Future Food Security

2020 ◽  
pp. 139-165
Author(s):  
Masahiro Kishii ◽  
Sukhwinder Singh
Keyword(s):  
Food Security ◽  
Production Technology ◽  
Wheat Breeding ◽  
Haploid Production

scholarly journals Population structure of Nepali spring wheat (Triticum aestivum L.) germplasm

2020 ◽  
Vol 20 (1) ◽  
Author(s):  
Kamal Khadka ◽  
Davoud Torkamaneh ◽  
Mina Kaviani ◽  
Francois Belzile ◽  
Manish N. Raizada ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Triticum Aestivum ◽  
Population Structure ◽  
Food Security ◽  
Spring Wheat ◽  
Principal Component ◽  
Genotyping By Sequencing ◽  
Triticum Aestivum L ◽  
Wheat Breeding ◽  
Exotic Germplasm

Abstract Background Appropriate information about genetic diversity and population structure of germplasm improves the efficiency of plant breeding. The low productivity of Nepali bread wheat (Triticum aestivum L.) is a major concern particularly since Nepal is ranked the 4th most vulnerable nation globally to climate change. The genetic diversity and population structure of Nepali spring wheat have not been reported. This study aims to improve the exploitation of more diverse and under-utilized genetic resources to contribute to current and future breeding efforts for global food security. Results We used genotyping-by-sequencing (GBS) to characterize a panel of 318 spring wheat accessions from Nepal including 166 landraces, 115 CIMMYT advanced lines, and 34 Nepali released varieties. We identified 95 K high-quality SNPs. The greatest genetic diversity was observed among the landraces, followed by CIMMYT lines, and released varieties. Though we expected only 3 groupings corresponding to these 3 seed origins, the population structure revealed two large, distinct subpopulations along with two smaller and scattered subpopulations in between, with significant admixture. This result was confirmed by principal component analysis (PCA) and UPGMA distance-based clustering. The pattern of LD decay differed between subpopulations, ranging from 60 to 150 Kb. We discuss the possibility that germplasm explorations during the 1970s–1990s may have mistakenly collected exotic germplasm instead of local landraces and/or collected materials that had already cross-hybridized since exotic germplasm was introduced starting in the 1950s. Conclusion We suggest that only a subset of wheat “landraces” in Nepal are authentic which this study has identified. Targeting these authentic landraces may accelerate local breeding programs to improve the food security of this climate-vulnerable nation. Overall, this study provides a novel understanding of the genetic diversity of wheat in Nepal and this may contribute to global wheat breeding initiatives.

scholarly journals Evaluation of Drought Tolerance of Some Wheat (Triticum aestivum L.) Genotypes through Phenology, Growth, and Physiological Indices

Agronomy ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1792
Author(s):  
M. Kaium Chowdhury ◽  
M. A. Hasan ◽  
M. M. Bahadur ◽  
Md. Rafiqul Islam ◽  
Md. Abdul Hakim ◽  
...  
Keyword(s):  
Food Security ◽  
Grain Yield ◽  
Compatible Solutes ◽  
Canopy Temperature ◽  
Field Capacity ◽  
Triticum Aestivum L ◽  
Wheat Breeding ◽  
Control Treatment ◽  
Wheat Genotypes ◽  
Drought Tolerant

Increasing human population and changing climate, which have given rise to frequent drought spells, pose a serious threat to global food security, while identification of high yielding drought tolerant genotypes remains a proficient approach to cope with these challenges. To offer a methodology for the evaluation of the drought-tolerant wheat genotypes based on the pheno-physiological traits, a field experiment was executed, entailing four wheat genotypes viz. BARI Gom 26, BAW 1158, BAW 1167, and BAW 1169 and two water conditions viz. control treatment (three times irrigation at 20, 50, and 70 DAS, i.e., 100% field capacity) and stressed treatment (no irrigation during the entire growing season). The results revealed that drought stress drastically reduced the days to booting, heading, anthesis and physiological maturity, relative water content (RWC), chlorophyll content, canopy temperature depression (CTD), and photo-assimilates-spike dry matter (SDM), grains spike−1 and grain yield of all wheat genotypes. In addition, the genotypes BAW 1167 and BARI Gom 26 remained more prone to adverse effects of drought as compared to BAW 1169 and BAW 1158. Furthermore, DS induced biosynthesis of compatible solutes such as proline, especially in BAW 1169, which enabled plants to defend against oxidative stress. It was inferred that BAW 1169 remained superior by exhibiting the best adaptation as indicated by the maximum relative values of RWC, total chlorophyll, CTD, proline content, SDM, grains spike−1, and grain yield of wheat. Thus, based on our findings, BAW 1169 may be recommended for general adoption and utilization in future wheat breeding programs aimed at developing potent drought-tolerant wheat genotypes to ensure food security on a sustainable basis.

scholarly journals The Evolving Battle Between Yellow Rust and Wheat: Implications for Global Food Security

2021 ◽  
Author(s):  
Laura Bouvet ◽  
Sarah Holdgate ◽  
Lucy James ◽  
Jane Thomas ◽  
Ian J. Mackay ◽  
...  
Keyword(s):  
Food Security ◽  
Puccinia Striiformis ◽  
Yellow Rust ◽  
Wheat Breeding ◽  
Yield Losses ◽  
Global Food Security ◽  
Global Spread ◽  
Yellow Rust Resistance ◽  
Global Food ◽  
Important Disease

Abstract Wheat (Triticum aestivum L.) is a global commodity, and its production is a key component underpinning worldwide food security. Yellow rust, also known as stripe rust, is a wheat disease caused by the fungus Puccinia striiformis f. sp. tritici (Pst), and results in yield losses in most wheat growing areas. Recently, the rapid global spread of genetically diverse sexually derived Pst races, which have now largely replaced the previous clonally propagated slowly evolving endemic populations, has resulted in further challenges for the protection of global wheat yields. However, advances in the application of genomics approaches, in both the host and pathogen, combined with classical genetic approaches, pathogen and disease monitoring, provide resources to help increase the rate of genetic gain for yellow rust resistance via wheat breeding while reducing the carbon footprint of the crop. Here we review key elements in the evolving battle between the pathogen and host, with a focus on solutions to help protect future wheat production from this globally important disease.

Anther Culture of Australian Wheat Germplasm Using Modified C17 Medium and Membrane Rafts

1991 ◽  
Vol 18 (4) ◽  
pp. 357 ◽  
Author(s):  
DJ Luckett ◽  
S Venkatanagappa ◽  
NL Darvey ◽  
RA Smithard
Keyword(s):  
Anther Culture ◽  
Doubled Haploid ◽  
Wheat Breeding ◽  
Membrane Rafts ◽  
Wheat Germplasm ◽  
Haploid Production ◽  
Australian Wheat ◽  
Culture Procedure

Experiments with wheat anther culture were conducted with the aim of assembling a workable system for doubled-haploid production for Australian wheat breeding. One Australian cultivar, Grebe, carrying the 1BL/1RS translocation was particularly responsive. A modified C17 medium was developed which proved effective when solidified with agarose or when used as a liquid in conjunction with membrane support rafts. The membrane rafts have great potential to assist the development of the anther culture procedure since the medium can be rapidly replenished or replaced with minimal disturbance of the tissue.

Substantial genetic yield gap estimated for wheat in Europe

2020 ◽  
Author(s):  
Mikhail Semenov ◽  
Nimai Senapati
Keyword(s):  
Food Security ◽  
Canopy Structure ◽  
Root Water Uptake ◽  
Wheat Breeding ◽  
Climatic Conditions ◽  
Yield Potential ◽  
Yield Gap ◽  
Global Food Security ◽  
The Difference ◽  
Global Food

<p>Improving yield potential and closing the yield gap are important to achieve global food security. Europe is the largest wheat producer, delivering about 35% of wheat globally, but European wheat's yield potential from genetic improvements is as yet unknown. We estimated wheat ‘genetic yield potential’, i.e. the yield of optimal or ideal genotypes in a target environment, across major wheat growing regions in Europe by designing in silico ideotypes. These ideotypes were optimised for current climatic conditions and based on optimal physiology, constrained by available genetic variation in target traits. A ‘genetic yield gap’ in a location was estimated as the difference between the yield potential of the optimal ideotype compared with a current, well-adapted cultivar. A large mean genetic yield potential (11–13 t ha−1) and genetic yield gap (3.5–5.2 t ha−1) were estimated under rainfed conditions in Europe. In other words, despite intensive wheat breeding efforts, current local cultivars were found to be far from their optimum, meaning that a large genetic yield gap still exists in European wheat. Heat and drought tolerance around flowering, optimal canopy structure and phenology, improved root water uptake and reduced leaf senescence under drought were identified as key traits for improvement. Closing this unexploited genetic yield gap in Europe through crop improvements and genetic adaptations could contribute towards global food security.</p>

scholarly journals The evolving battle between yellow rust and wheat: implications for global food security

2021 ◽  
Author(s):  
Laura Bouvet ◽  
Sarah Holdgate ◽  
Lucy James ◽  
Jane Thomas ◽  
Ian J. Mackay ◽  
...  
Keyword(s):  
Food Security ◽  
Puccinia Striiformis ◽  
Yellow Rust ◽  
Wheat Breeding ◽  
Yield Losses ◽  
Global Food Security ◽  
Global Spread ◽  
Yellow Rust Resistance ◽  
Global Food ◽  
Important Disease

AbstractWheat (Triticum aestivum L.) is a global commodity, and its production is a key component underpinning worldwide food security. Yellow rust, also known as stripe rust, is a wheat disease caused by the fungus Puccinia striiformis Westend f. sp. tritici (Pst), and results in yield losses in most wheat growing areas. Recently, the rapid global spread of genetically diverse sexually derived Pst races, which have now largely replaced the previous clonally propagated slowly evolving endemic populations, has resulted in further challenges for the protection of global wheat yields. However, advances in the application of genomics approaches, in both the host and pathogen, combined with classical genetic approaches, pathogen and disease monitoring, provide resources to help increase the rate of genetic gain for yellow rust resistance via wheat breeding while reducing the carbon footprint of the crop. Here we review key elements in the evolving battle between the pathogen and host, with a focus on solutions to help protect future wheat production from this globally important disease.

Food Security Surveillance in the Palestinian Territories

2002 ◽  
Vol 17 (S2) ◽  
pp. S20-S21
Author(s):  
Gregg Greenough ◽  
Ziad Abdeen ◽  
Bdour Dandies ◽  
Radwan Qasrawi
Keyword(s):  
Food Security ◽  
Palestinian Territories ◽  
Security Surveillance

Averting robo-bees: why free-flying robotic bees are a bad idea

2019 ◽  
Vol 3 (6) ◽  
pp. 723-729
Author(s):  
Roslyn Gleadow ◽  
Jim Hanan ◽  
Alan Dorin
Keyword(s):  
Climate Change ◽  
Computer Simulation ◽  
Food Security ◽  
European Countries ◽  
Plant Interactions ◽  
Plant Insect Interactions ◽  
Native Habitat ◽  
Insect Pollinators ◽  
Insect Interactions

Food security and the sustainability of native ecosystems depends on plant-insect interactions in countless ways. Recently reported rapid and immense declines in insect numbers due to climate change, the use of pesticides and herbicides, the introduction of agricultural monocultures, and the destruction of insect native habitat, are all potential contributors to this grave situation. Some researchers are working towards a future where natural insect pollinators might be replaced with free-flying robotic bees, an ecologically problematic proposal. We argue instead that creating environments that are friendly to bees and exploring the use of other species for pollination and bio-control, particularly in non-European countries, are more ecologically sound approaches. The computer simulation of insect-plant interactions is a far more measured application of technology that may assist in managing, or averting, ‘Insect Armageddon' from both practical and ethical viewpoints.

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