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Mogens Støvring Hovmøller, Sajid Ali, Stephanie Walter, Chris K
Sørensen, Mehran Patpour, Yan-Yun Chen, Tine Thach, Julian R
Algaba, Poul Lassen, Jens G Hansen and Annemarie F Justesen,
Global Rust Reference Center: Achievements and
challenges ahead in breeding for stripe rust
resistance in wheat
Outline
• Facilities: People, space and resources
• The Scandinavian “early-warning” system
• Current stripe rust situation in Europe
• Story of the “Warrior” race in Europe,
• Lessons learnt from 25 years of yellow/stripe rust
research
International collaborators
• Kumarse Nazari, ICARDA
• Amor Yahyaoui, ICARDA
• Ravi Singh, CIMMYT
• Dave Hodson, CIMMYT
• Claude Pope, INRA (F)
• Jonathan Yuen, Uppsala University (S)
• Cristobal Uauy, JIC (UK)
• Rosemary Bayles, NIAB (UK)
• Kerstin Flath, JKI (D)
• James Brown, JIC(UK)
• > 40 people who submitted wheat rust
samples from Asia, Africa and South
America
GRRC-team March 2014
Wheat rust quarantine
facility
GRRC green house
& lab space, April 2014
• 7 quarantine zones
(8-12 cabins/zone)
• 3 pathogen labs
• 1 molecular lab
• N2 storage facility
• Flakkebjerg: 150 ha field
experimental area
Attack in previous resistant variety (OBS-nurseries,
extension, farmers fields, etc.)
GRRC
Multiplication of spores samples
from infected plants
Year 0
Year 1
Year 2 and later
The ”Scandinavian model” for yellow/stripe rust early-warning
Attack in previous resistant variety (OBS-nurseries,
extension, farmers fields, etc.)
GRRC
Multiplication of spores samples
from infected plants
Year0
The ”Scandinavian model” for yellow/stripe rust early-warning
• Spore samples stored in
N2 isolate bank
• DNA fingerprint: Laboratory
• Race testing: Seedlings in
green house, (& test for
aggressiveness)
Attack in previous resistant variety (OBS-nurseries,
extension, farmers fields, etc.)
GRRC
Multiplication of spores samples
From infected plants
Year 0
The ”Scandinavian model” for yellow/stripe rust early-warning
• Spore samples stored in
N2 isolate bank
• DNA fingerprint: Laboratory
• Race testing: Seedlings in
green house, (& test for
aggressiveness)
• Interpretation of results
in EU/global context
• Publication on-line:
• www.wheatrust.org
If ”new” raceMutiplication of
additional spore
samples
Attack in previous resistant variety (OBS-nurseries,
extension, farmers fields, etc.)
GRRC
Multiplication of spores samples
From infected plants
Year 0
The ”Scandinavian model” for yellow/stripe rust early-warning
• Spore samples stored in
N2 isolate bank
• DNA fingerprint: Laboratory
• Race testing: Seedlings in
green house, (& test for
aggressiveness)
• Interpretation of results
in EU/global kontekst
• Publicering on-line:
www.wheatrust.org
If ”new” raceMutiplication of
additional spore
samples
Private plant breeding
companies:
Screening for resistance
using new (and other) races
GRRC:
Inoc. Nurseries using
the new race green
house/ field
Year 1
Attack in previous resistant variety (OBS-nurseries,
extension, farmers fields, etc.)
GRRC
Multiplication of spores samples
From infected plants
Year 0
The ”Scandinavian model” for yellow/stripe rust early-warning
• Spore samples stored in
N2 isolate bank
• DNA fingerprint: Laboratory
• Race testing: Seedlings in
green house, (& test for
aggressiveness)
• Interpretation of results
in EU/global context
• Publication on-line:
www.wheatrust.org
If ”new” raceMutiplication of
additional spore
samples
Rust susceptibility to new
race in breeding lines and
varieties
Disease management
recommendations:
• Crop protection on-line
resistance grouping
• Extension leaflets
• Annual report of variety
trials (October)
• Articles newspapers/
magazines
• Oral presentations
Year 1
Attack in previous resistant variety (OBS-nurseries,
extension, farmers fields, etc.)
GRRC
Multiplication of spores samples
From infected plants
Year 0
The ”Scandinavian model” for yellow/stripe rust early-warning
• Spore samples stored in
N2 isolate bank
• DNA fingerprint: Laboratory
• Race testing: Seedlings in
green house, (& test for
aggressiveness)
• Interpretation of results
in EU/global kontekst
• Publicering on-line:
www.wheatrust.org
If ”new” raceMutiplication of
additional spore
samples
Rust susceptibility to new
race in breeding lines and
varieties
Disease management
recommendations:
• Crop protection on-line
resistance grouping
• Extension leaflets
• Annual report of variety
trials (October)
• Articles newspapers/
magazines
• Oral presentations
Year 1
Year 2 and later
ongoing
• Release of new resistant varieties
• Variety testing (yield, quality,
resistance)
• Marketing and seed multiplication
(Denmark: 25-30% of recommended
list varieties are exchanged every
year)
The current Stripe rust situation in EuropeTriticale, Denmark, 11th March, 2014
The current Stripe rust situation in EuropeWheat: The Nederlands, 1st April 2014
Photo: Wopke van der Werf
Race dynamics of P. striiformis in Europe 2000-2013
Pie chart
Spatial distribution of races 2010-2013
Case study: Origin, spread and distribution of the
Warrior race
Methodology
Selection of isolates
Part A
• Representative isolates of the Warrior race 2011-2013 [Spain, France,
Germany, United Kingdom, Denmark, Sweden]
• Representative isolates of non-Warrior races 2000-2010 [European
origin]
• Representative isolates from epidemic sites in Central Asia 2010-2012
[Uzbekistan, Tajikistan]
Part B
• Reference isolates from global study representing 6 continents 2005-
2010 (Ali et al., 2014) , including recombining populations from the
Himalayan region “Center of diversity”
Case study: Origin, spread and distribution of the
Warrior race
Methodology
Isolate characterization
Part A isolates
• Race phenotyped in national labs: France, Germany, UK
• GRRC: Denmark, Sweden, Spain, Portugal, Uzbekistan, Tajikistansome overlaps of isolates and differential seeds between national labs and GRRC
• SSR genotyped at GRRC/Uppsala, using 16 of 20 SSR markers from
Ali et al., 2014
Part B isolates
• Genotyping results from Ali et al. 2014 (INRA-Grignon, France) aligned
with results for Part A isolates
One common dataset developed
Case study: Origin, spread and distribution of the
Warrior race
Results
• Race phenotyping: One dominant race, another group was identified
based on supplementary differentials, occasional small differences at
the quantitative level for specific differentials
• SSR genotyping: One dominant MLG, at least two others were
identified
• No isolates in the „Global set‟ (Ali et al. 2014) covering six continents
had a matching race/SSR genotype
• Never detected in GRRC surveyed areas
K2
K3
K4
K5
K6
K7
K8
K9
K10
G1
G2
G3
G4
G5
G6
Cen
tral
A
sia
20
10
-2
01
3
Euro
pe
20
11
-2
01
3Worldwide groups following Ali et al. 2014: PLOS
Pathogens
K2
K3
K4
K5
K6
K7
K8
K9
K10
G1
G2
G3
G4
G5
G6
Cen
tral
A
sia
20
10
-2
01
3
Euro
pe
20
11
-2
01
3Worldwide groups following Ali et al. 2014: PLOS
Pathogens
Case study: Origin, spread and distribution of the
Warrior race
Question 1: Mutant/recombinant within the existing European Pst pop.
No, Warrior is not a NW European type strain – many alleles exotic to EU pop
Question 2:
Does Warrior represent a recent invasion into Europe from the central Asian
2010 and onward epidemics?
No, although sharing some alleles with central Asian population. CA pop was
distinct, and Warrior type isolates were not re-sampled in Central Asia
Question 3:
What is the likely origin or the Warrior race?
Closely related but still divergent from the predominant Chinese population
(the exact race/SSR genotype not represented in previous studies
Chris Sørensen
Lessons learnt
• Ongoing, pathogen phenotyping necessary for rapid detection of
new pathogen variability (challenging – without coordinated
reference collections/materials/labs – it may not work)
Lessons learnt
• Ongoing, pathogen phenotyping necessary for rapid detection of
new pathogen variability (challenging – without coordinated
reference collections/materials/labs – it may not work)
• Race phenotyping not sufficient for understanding spread
and evolution
• Molecular genotyping/sequencing not sufficient for getting
the relevant information concerning host „susceptibility‟
• Assessment of quantitative traits important (e.g., adaptation
to warm environments) but labor intensive
• Rapid responses (and reporting) essential
Lessons learnt
• Ongoing, pathogen phenotyping necessary for rapid detection of
new pathogen variability (challenging – without coordinated
reference collections/materials/labs – it may not work)
• Race phenotyping not sufficient for understanding spread
and evolution
• Molecular genotyping/sequencing not sufficient for getting
the relevant information concerning host „susceptibility‟
• Assessment of quantitative traits important (e.g., adaptation
to warm environments) but labor intensive
• Rapid responses (and reporting) essential
• Rapid pathogen spread – Rapid pathogen evolution at all levels
• Center of diversity in “Himalayan region” – clonal reproduction
most other places
• Diversity for disease resistance in the host important, - R-genes
with minor effects may also be „overcome‟ but at a slower rate
• Avoid “rust suckers”
www.wheatrust.org/
Helsingør (30 km N Copenhagen), Denmark, July 5-8, 2015
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