TY - JOUR
T1 - Pre-emptive breeding against Karnal bunt infection in common wheat
T2 - Combining genomic and agronomic information to identify suitable parents
AU - Emebiri, Livinus
AU - Hildebrand, Shane
AU - Tan, Mui Keng
AU - Juliana, Philomin
AU - Singh, Pawan K.
AU - Fuentes-Davila, Guillermo
AU - Singh, Ravi P.
N1 - Funding Information:
We thank the CGIAR Research Program on Wheat for their support. We also thank all field technicians involved in generating the field and laboratory data. Funding. This study was funded jointly by grants from the Grains Research & Development Corporation (GRDC), The NSW Department of Primary Industry (NSW DPI, Australia), and the International Maize and Wheat Improvement Center (CIMMYT, Mexico) under Grant Number DAN00174.
Funding Information:
This study was funded jointly by grants from the Grains Research & Development Corporation (GRDC), The NSW Department of Primary Industry (NSW DPI, Australia), and the International Maize and Wheat Improvement Center (CIMMYT, Mexico) under Grant Number DAN00174.
Publisher Copyright:
© Copyright © 2021 Emebiri, Hildebrand, Tan, Juliana, Singh, Fuentes-Davila and Singh.
PY - 2021/7/29
Y1 - 2021/7/29
N2 - Wheat (Triticum aestivum L.) is the most widely
grown cereal crop in the world and is staple food to half the world’s
population. The current world population is expected to reach 9.8
billion people by 2050, but food production is not expected to keep pace
with demand in developing countries. Significant opportunities exist
for traditional grain exporters to produce and export greater amounts of
wheat to fill the gap. Karnal bunt, however, is a major threat, due to
its use as a non-tariff trade barrier by several wheat-importing
countries. The cultivation of resistant varieties remains the most
cost-effective approach to manage the disease, but in countries that are
free of the disease, genetic improvement is difficult due to quarantine
restrictions. Here we report a study on pre-emptive breeding designed
to identify linked molecular markers, evaluate the prospects of genomic
selection as a tool, and prioritise wheat genotypes suitable for use as
parents. In a genome-wide association (GWAS) study, we identified six
DArTseq markers significantly linked to Karnal bunt resistance, which
explained between 7.6 and 29.5% of the observed phenotypic variation.
The accuracy of genomic prediction was estimated to vary between 0.53
and 0.56, depending on whether it is based solely on the identified
Quantitative trait loci (QTL) markers or the use of genome-wide markers.
As genotypes used as parents would be required to possess good yield
and phenology, further research was conducted to assess the agronomic
value of Karnal bunt resistant germplasm from the International Maize
and Wheat Improvement Center (CIMMYT). We identified an ideal genotype,
ZVS13_385, which possessed similar agronomic attributes to the highly
successful Australian wheat variety, Mace. It is phenotypically
resistant to Karnal bunt infection (<1% infection) and carried all
the favourable alleles detected for resistance in this study. The
identification of a genotype combining Karnal bunt resistance with
adaptive agronomic traits overcomes the concerns of breeders regarding
yield penalty in the absence of the disease.
AB - Wheat (Triticum aestivum L.) is the most widely
grown cereal crop in the world and is staple food to half the world’s
population. The current world population is expected to reach 9.8
billion people by 2050, but food production is not expected to keep pace
with demand in developing countries. Significant opportunities exist
for traditional grain exporters to produce and export greater amounts of
wheat to fill the gap. Karnal bunt, however, is a major threat, due to
its use as a non-tariff trade barrier by several wheat-importing
countries. The cultivation of resistant varieties remains the most
cost-effective approach to manage the disease, but in countries that are
free of the disease, genetic improvement is difficult due to quarantine
restrictions. Here we report a study on pre-emptive breeding designed
to identify linked molecular markers, evaluate the prospects of genomic
selection as a tool, and prioritise wheat genotypes suitable for use as
parents. In a genome-wide association (GWAS) study, we identified six
DArTseq markers significantly linked to Karnal bunt resistance, which
explained between 7.6 and 29.5% of the observed phenotypic variation.
The accuracy of genomic prediction was estimated to vary between 0.53
and 0.56, depending on whether it is based solely on the identified
Quantitative trait loci (QTL) markers or the use of genome-wide markers.
As genotypes used as parents would be required to possess good yield
and phenology, further research was conducted to assess the agronomic
value of Karnal bunt resistant germplasm from the International Maize
and Wheat Improvement Center (CIMMYT). We identified an ideal genotype,
ZVS13_385, which possessed similar agronomic attributes to the highly
successful Australian wheat variety, Mace. It is phenotypically
resistant to Karnal bunt infection (<1% infection) and carried all
the favourable alleles detected for resistance in this study. The
identification of a genotype combining Karnal bunt resistance with
adaptive agronomic traits overcomes the concerns of breeders regarding
yield penalty in the absence of the disease.
KW - genome-wide association study
KW - genomic prediction
KW - grain yield
KW - GWAS
KW - Karnal bunt resistance
KW - Tilletia indica
KW - Triticum aestivum
KW - wheat
UR - http://www.scopus.com/inward/record.url?scp=85112423742&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85112423742&partnerID=8YFLogxK
U2 - 10.3389/fpls.2021.675859
DO - 10.3389/fpls.2021.675859
M3 - Article
C2 - 34394138
AN - SCOPUS:85112423742
VL - 12
SP - 1
EP - 11
JO - Frontiers in Plant Science
JF - Frontiers in Plant Science
SN - 1664-462X
M1 - 675859
ER -