Molecular breeding for improving waterlogging tolerance in wheat.

2021 ◽  
pp. 90-115
Author(s):  
R. Esten Mason ◽  
Trenton L. Roberts ◽  
Richard Boyles ◽  
Andrea Acuna ◽  
Maria N. Arguello ◽  
...  
Keyword(s):  
Genomic Selection ◽  
Genetic Control ◽  
Marker Assisted Selection ◽  
Molecular Breeding ◽  
Current Understanding ◽  
Waterlogging Tolerance ◽  
Cultivar Development ◽  
Macro And Micronutrients ◽  
Underlying Soil ◽  
Uptake And Transport

Abstract This chapter summarizes the current understanding of the response of wheat to waterlogging stress, the genetic control of uptake and transport of macro- and micronutrients, and the QTLs and genes associated with tolerance mechanisms. Potential targets for molecular breeding through marker-assisted selection and the potential for genomic selection are discussed in order to provide a better understanding of the biology and genes underlying soil waterlogging tolerance, as well as clarity and direction for breeders for future molecular breeding targets to expedite cultivar development.

scholarly journals Molecular breeding for resilience in maize - A review

2015 ◽  
Vol 7 (2) ◽  
pp. 1057-1063
Author(s):  
Asima Gazal ◽  
Z. A. Dar ◽  
A. A. Lone ◽  
I. Abidi ◽  
G. Ali
Keyword(s):  
Genomic Selection ◽  
Complex Traits ◽  
Marker Assisted Selection ◽  
Molecular Breeding ◽  
Recurrent Selection ◽  
Selection Marker ◽  
Maize Breeding ◽  
Time Duration ◽  
Breeding Populations ◽  
Breeding Research

Abiotic and biotic constraints have widespread yield reducing effects on maize and should receive high priority for maize breeding research. Molecular Breeding offers opportunities for plant breeders to develop cultivars with resilience to such diseases with precision and in less time duration. The term molecular breeding is used to describe several modern breeding strategies, including marker-assisted selection, marker-assisted backcrossing, marker-assisted recurrent selection and genomic selection. Recent advances in maize breeding research have made it possible to identify and map precisely many genes associated with DNA markers which include genes governing resistance to biotic stresses and genes responsible for tolerance to abiotic stresses. Marker assisted selection (MAS) allows monitoring the presence, absence of these genes in breeding populations whereas marker assisted backcross breeding effectively integrates major genes or quantitative trait loci (QTL) with large effect into widely grown adapted varieties. For complex traits where multiple QTLs control the expression, marker assisted recurrent selection (MARS) and genomic selection (GS) are employed to increase precision and to reduce cost of phenotyping and time duration. The biparental mapping populations used in QTL studies in MAS do not readily translate to breeding applications and the statistical methods used to identify target loci and implement MAS have been inadequate for improving polygenic traits controlled by many loci of small effect. Application of GS to breeding populations using high marker densities is emerging as a solution to both of these deficiencies. Hence, molecular breeding approaches offers ample opportunities for developing stress resilient and high-yielding maize cultivars.

scholarly journals Improving virus production through quasispecies genomic selection and molecular breeding

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Francisco J. Pérez-Rodríguez ◽  
Lucía D’Andrea ◽  
Montserrat de Castellarnau ◽  
Maria Isabel Costafreda ◽  
Susana Guix ◽  
...  
Keyword(s):  
Genomic Selection ◽  
Molecular Breeding ◽  
Virus Production

scholarly journals Genome-Wide Association Studies and Genomic Selection for Grain Protein Content Stability in a Nested Association Mapping Population of Spring Wheat

2021 ◽  
Author(s):  
Karansher S. Sandhu ◽  
Paul D. Mihalyov ◽  
Megan J. Lewien ◽  
Michael O. Pumphrey ◽  
Arron H Carter
Keyword(s):  
Association Mapping ◽  
Protein Content ◽  
Genomic Selection ◽  
Genetic Control ◽  
Spring Wheat ◽  
Grain Protein Content ◽  
Genome Wide Association ◽  
Grain Protein ◽  
Nested Association Mapping ◽  
Genome Wide

Grain protein content (GPC) is controlled by complex genetic systems and their interactions, and is an important quality determinant for hard spring wheat as it has a positive effect on bread and pasta quality. GPC is variable among genotypes and strongly influenced by environment. Thus, understanding the genetic control of wheat GPC and identifying genotypes with improved stability is an important breeding goal. The objectives of this research were to identify genetic backgrounds with less variation for GPC across environments and identify quantitative trait loci (QTLs) controlling the stability of GPC. A spring wheat nested association mapping (NAM) population of 650 recombinant inbred lines (RIL) derived from 26 diverse founder parents crossed to one common parent, 'Berkut', was phenotyped over three years of field trials (2014-2016). Genomic selection models were developed and compared based on prediction of GPC and GPC stability. After observing variable genetic control of GPC within the NAM population, seven RIL families displaying reduced marker-by-environment interaction were selected based on a stability index derived from Finlay-Wilkinson regression. A genome-wide association study identified seven significant QTLs for GPC stability with a Bonferroni-adjusted P value <0.05. This study also demonstrated that genome-wide prediction of GPC with ridge regression best linear unbiased estimates reached up to r = 0.69. Genomic selection can be used to apply selection pressure for GPC and improve genetic gain for GPC.

scholarly journals Genomic Selection and Genome-Wide Association Studies for Grain Protein Content Stability in a Nested Association Mapping Population of Wheat

Agronomy ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 2528
Author(s):  
Karansher S. Sandhu ◽  
Paul D. Mihalyov ◽  
Megan J. Lewien ◽  
Michael O. Pumphrey ◽  
Arron H. Carter
Keyword(s):  
Association Mapping ◽  
Protein Content ◽  
Genomic Selection ◽  
Genetic Control ◽  
Spring Wheat ◽  
Grain Protein Content ◽  
Genome Wide Association ◽  
Grain Protein ◽  
Nested Association Mapping ◽  
Genome Wide

Grain protein content (GPC) is controlled by complex genetic systems and their interactions and is an important quality determinant for hard spring wheat as it has a positive effect on bread and pasta quality. GPC is variable among genotypes and strongly influenced by the environment. Thus, understanding the genetic control of wheat GPC and identifying genotypes with improved stability is an important breeding goal. The objectives of this research were to identify genetic backgrounds with less variation for GPC across environments and identify quantitative trait loci (QTLs) controlling the stability of GPC. A spring wheat nested association mapping (NAM) population of 650 recombinant inbred lines (RIL) derived from 26 diverse founder parents crossed to one common parent, ‘Berkut’, was phenotyped over three years of field trials (2014–2016). Genomic selection models were developed and compared based on predictions of GPC and GPC stability. After observing variable genetic control of GPC within the NAM population, seven RIL families displaying reduced marker-by-environment interaction were selected based on a stability index derived from a Finlay–Wilkinson regression. A genome-wide association study identified eighteen significant QTLs for GPC stability with a Bonferroni-adjusted p-value < 0.05 using four different models and out of these eighteen QTLs eight were identified by two or more GWAS models simultaneously. This study also demonstrated that genome-wide prediction of GPC with ridge regression best linear unbiased estimates reached up to r = 0.69. Genomic selection can be used to apply selection pressure for GPC and improve genetic gain for GPC.

Molecular breeding for combating salinity stress in sorghum: progress and prospects.

2021 ◽  
pp. 421-432
Author(s):  
Nidhi Chakma ◽  
Moutoshi Chakraborty ◽  
Salma Bhyan ◽  
Mobashwer Alam
Keyword(s):  
Salt Tolerance ◽  
Marker Assisted Selection ◽  
Molecular Breeding ◽  
Field Conditions ◽  
Salt Tolerant ◽  
Conventional Breeding ◽  
Qtl Validation ◽  
Marker Validation ◽  
Controlled Environments ◽  
Breeding Techniques

Abstract This chapter discusses current progress and prospects of molecular breeding and strategies for developing better saline-tolerant sorghum (Sorghum bicolor) varieties. Most molecular breeding techniques for salt tolerance have been carried out in controlled environments where the plants were not exposed to any variation of the surrounding environment, producing reliable results. Due to the polygenic nature of salt tolerance, the identified quantitative trait loci (QTLs) could be false QTLs. Therefore, QTL validation is important in different plant populations and field conditions. Subsequently, marker validation is important before utilizing marker-assisted selection for screening salt-tolerant plants. Combining molecular breeding with conventional breeding can hasten the development of salt-tolerant sorghum varieties.

Molecular breeding: marker-assisted selection combined with biolistic transformation for blast and bacterial blight resistance in Indica rice (cv. CO39)

2004 ◽  
Vol 14 (1) ◽  
pp. 61-71 ◽  
Author(s):  
Narayanan N. Narayanan ◽  
Niranjan Baisakh ◽  
Norman P. Oliva ◽  
Casiana M. VeraCruz ◽  
Samuel S. Gnanamanickam ◽  
...  
Keyword(s):  
Marker Assisted Selection ◽  
Bacterial Blight ◽  
Molecular Breeding ◽  
Indica Rice ◽  
Biolistic Transformation ◽  
Blight Resistance ◽  
Bacterial Blight Resistance

scholarly journals Conventional breeding, marker-assisted selection, genomic selection and inbreeding in clonally propagated crops: a case study for cassava

2015 ◽  
Vol 128 (9) ◽  
pp. 1647-1667 ◽  
Author(s):  
Hernán Ceballos ◽  
Robert S. Kawuki ◽  
Vernon E. Gracen ◽  
G. Craig Yencho ◽  
Clair H. Hershey
Keyword(s):  
Genomic Selection ◽  
Marker Assisted Selection ◽  
Conventional Breeding

scholarly journals Diversity of Macro- and Micronutrients in the Seeds of Lentil Landraces

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Tolga Karaköy ◽  
Halil Erdem ◽  
Faheem S. Baloch ◽  
Faruk Toklu ◽  
Selim Eker ◽  
...  
Keyword(s):  
Nutritional Value ◽  
Principal Component ◽  
Mineral Elements ◽  
Breeding Programs ◽  
Plant Foods ◽  
Cross Breeding ◽  
Legume Seeds ◽  
New Varieties ◽  
Macro And Micronutrients ◽  
Uptake And Transport

Increasing the amount of bioavailable mineral elements in plant foods would help to improve the nutritional status of populations in developing countries. Legume seeds have the potential to provide many essential nutrients. It is important to have information on genetic variations among different lentil populations so that plant breeding programs can use new varieties in cross-breeding programs. The main objective of this study was to characterize the micro- and macronutrient concentrations of lentil landraces seeds collected from South-Eastern Turkey. We found impressive variation in the micro- and macroelement concentrations in 39 lentil landraces and 7 cultivars. We investigated the relationships of traits by correlation analysis and principal component analysis (PCA). The concentrations of several minerals, particularly Zn, were positively correlated with other minerals, suggesting that similar pathways or transporters control the uptake and transport of these minerals. Some genotypes had high mineral and protein content and potential to improve the nutritional value of cultivated lentil. Cross-breeding of numerous lentil landraces from Turkey with currently cultivated varieties could improve the levels of micro- and macronutrients of lentil and may contribute to the worldwide lentil quality breeding program.

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