Folie 1 - Phosphorus in Soils and Plants

Report
Institute of Plant Breeding
Niamey, Niger
Genetic variation under low phosphorus conditions in
West African pearl millet inbred lines: Seedling and
mature plant phosphorus uptake and utilization
efficiency
Dorcus C. Gemenet, C. Tom Hash,
Ousmane Sy, Roger G. Zangre,
Moussa D Sanogo, Willmar L. Leiser
and Bettina I.G. Haussmann
Introduction
Phosphate rock-the largest global source
of phosphorus fertilizers
Diminishing phosphate rock resources
Increasing phosphorus fertilizer prices
Unaffordable to resource-poor farmers
Host-plant tolerance to low soil P
•Efficient use of scarce resource
•Affordable option RPF
Source, Cordell 2011
Questions
Is there genetic variation for P use efficiency in
the WA pearl millet?
How is this variation expressed in seedling (pot)
and adult (field) plant stages?
Is this variation expressed in performance of grain
yield in independent environments?
Which traits show potential for use in selection
for indirect selection of grain yield under low P
Methodology
HP
Field evaluation
Sadore-Niger
Pot evaluation SadoreNiger
LP
Two treatments
Samples for plant
tissue P analysis
Yield trials in
four countries
Results
160
2.5
155
2.4
150
2.3
145
2.2
140
2.1
SWT -P
SWT +P
PCG -P
PCG +P
300
0.28
200
0.26
0.24
100
0.2
0
58.5
58
57.5
57
56.5
56
55.5
55
Pot experiment
0.22
PBM -P
PUTE -P
PBM +P
PUTE +P
80
60
40
20
0
PHI -P
PHI +P
SGY-P
SGY +P
Performance under -P and +P
of traits under field conditions
Field experiment
Conclusions
●
Seedling and mature plants varied significantly for both P
efficiency traits
●
P utilization increased under low P; P uptake was more
important for grain production
● The right balance of both traits is needed for sustainable
performance under low P
●
Breeding for low-P tolerance should be integrated with systemoriented research
Acknowledgements
For finacial support:
The German Federal Ministry for Economic Cooperation and
Development (BMZ)
Foundation ‘Fiat Panis’ in Germany
The McKnight Foundation
The Food Security Centre-University of Hohenheim
For conducting trials:
ICRISAT; Niger,
INERA, Burkina Faso
IER, Mali
ISRA, Senegal
University of Hohenheim
Thank you, the audience

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