Folie 1 - Phosphorus in Soils and Plants
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Transcript Folie 1 - Phosphorus in Soils and Plants
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