Zerihun Tadele
Institute of Plant Sciences
University of Bern
30 - 31 August 2018. Gent-Zwijnaarde, Belgium. IPBO conference 2018: “Scientific innovation for a sustainable development of African agriculture”
1. Lodging and Drought
Resistant Tef
Zerihun Tadele
Institute of Plant Sciences
University of Bern
IPBO, Ghent, August 31, 2018
2. Yield potential & gap
Goals:
• To increase
productivity
per unit area
• To narrow the
yield gap
2
Tadele. Agronomy 2017, 7:22
3. Challenges for boosting productivity
1. Population increase vs food production
2. Environmental stresses: biotic & abiotic
3. Inherent properties of the plant
4. Biofuel production
5. Land and investment policies
6. Climate change: impact on crop cultivation
Brazil (2030) Central America (2030)
Maize
-10%
Rice
-14%
Wheat
-14%
Wheat
-9%
Rice
-10%
Bean
-4%
http://www.elsevier.com/connect/how-will-climate-change-affect-food-security
4. Why research on tef?
• Staple food for > 60 mio.
People
• Cultivated > 3 mio. ha in
Ethiopia
• Adapts to extreme climatic
& soil conditions
• Life-style crop (super grain):
absence of gluten
• Low productivity
• Little research by global
community
% cereal area
0
10
20
30
40
0,0
1,0
2,0
3,0
4,0
Yield (t/ha)
4
5. Tef is closely related to finger millet
5
BMC Genomics (2014) 15: 581
11. Mutation breeding
Varieties released: 3222; crop types: >210; countries: >70;
Mutagens: Physical (x-ray, gamma-ray) & chemicals (EMS)
Crop Variety Trait Country Value
Barley
Golden
promise
Semi-dwarf, salt
tolerant
UK 417 mio $
Durum
wheat
Creso
Grain quantity &
quality
Italy 1.8 bio $
Rice RD16 Aromatic Thailand 16.9 bio $
Chickpea
CM-
88/98
High yield, blast
resistant
Pakistan 9.6 mio $
Sunflower NuSun Quality oil USA 149 mio $
Cotton NIAb-78
Early muturity,
determinate
Pakistan 3 .0 bio $
[
Euphytica (2004) 135:187-204; http://www-naweb.iaea.org/nafa/pbg/mutation-breeding.html
11
12. Mutation
induction
M1 population
Mutation
detection
Mutation
breeding
Candidate line(s)
with improved
trait(s)
LiCOR DNA
analyzer
Agarose
Electrophoresis
Next Generation
Sequencing
(NGS)
Introgression to elite
cultivar(s)
TILLING population
Improved cultivar
with desirable
trait(s)
High Resolution
Melt (HRM)
Non-denaturing
Polyacrylamide
gel
Pollen
Seed
Callus M2 population
Mutation breeding: value-chain
13. Increase diversity through mutagenesis
Used for screening for lodging, drought & soil acidity tolerance
EMS mutagenesis
(four genotypes)
M1 population M2 population
~ 12 000~ 18 000
13
17. Candidate gene approach
1717
Expt Botany (2015) 66: 933-944
2 µM Propyzymide
(microtublue depolymerization)
• Diverse hormones and inhibitors:
no obvious effect
• Mutations in microtubule
• twisted dwarf 1 (tid1) in rice
• lefty, spiral (spr) in Arabidopsis
• Taxol: micro-tubule stabilizing drug
(insignificant effect)
• Oryzalin: disrupts microtubule by
binding to α-tubulin
(mutant insensitive)
18. Mutated gene
18
• Mutation in Tua1
• CAPS marker: cla 1 restriction
• Three α-tubulin genes: Tua1, Tua2 and Tua3
Expt Botany (2015) 66: 933-944
19. Mechanical properties of tef plant
Pushing – root anchorage Bending – flexural rigidity
To provide information to breeders 19
20. Materials: ecotypes & cross sections
10
cm
10 cm
bottom
internode
(No.1) (hollow ellipse-
shaped culm section)
top internode
(No. 5)
(filled circular-shaped culm
section)
21. Safety factor for lodging
The safety factor is the
ratio of the weight of the
plant, its angle and center
of gravity to the breaking
force of the plant. It is
measure of how many
times its own weight the
plant can withstand
before breaking.
21
22. 22
Drought tolerant tef (dtt)
Stomata length Stomata number
• Adaxial (upper) side:
o High number of
stomata
o Smaller stomata
• dtt:
o less number of
stomata
o smaller stomata
tdt: terminal drought
tolerant
F7 progenies
being tested at
drought prone
areas in Ethiopia
27. Embryo-rescue
Tef x E. nindensis
Super tef
High yield
Extreme drought tolerant
Wild Eragrostis species
• 80 Eragrostis species at IPS
• E. curvula: lodging tolerant
• E. nindensis: drought tolerant
Introduce key traits from wild species
Flow-
cytometry
Diploid
Tef
(Tsedey)
E. rigidior
E. lehimania
29. Variety development
(through hybridization)
Improved Cv. Desirable property Undesirable property
• Tsedey wide adaptation lodging susceptible
• Magna consumer preference lodging susceptible
• Quncho high yield &
consumer preference lodging susceptible
Our candidates
• Kegne lodging tolerant low yield
• GA-10 lodging tolerant, tillers
• Dtt2 drought tolerant low yield
• Dtt13 drought tolerant low yield
>50% of the total of 95 crosses made by the National Tef
Research Program used our candidate lines as a parent
29
30. Muti-location testing
• 16 experiments at 24 traditional
tef growing areas.
– Distance from AA: 655km W, 955 N,
770 km NW
– Altitude: 1400 m We, 2500 m Bi/Sham
– Climate: Arid (Mehoni), semi-arid (Dh,
AT), Cool (Ho)
• 10 Non-traditional tef growing
areas (irrigated & rainfed).
– Distance: 750 km W, 900 km NW, 600
km E
30
36. Summary
36
• Goals & strategy
• Traits of interest: lodging & drought tolerance
• Omics: genome, transcriptome, RNAseq, microRNA
• Wild crosses
• Variety development & dissemination
• Value-chain approach: from research to development
(and consumption)
• Research on both major and orphan crops
• Involve all relevant stakeholders