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[Wheat adaptation] post-doctoral position
at UMR EGC Grignon, FRANCE
The Institut National de la Recherche Agronomique
(INRA) is seeking an innovative, self-motivate,
scientifically oustanding candidate for a
post-doctoral position to investigate mechanisms
involved in nitrogen deficiency tolerance of
bread wheat using a simplified model of C/N
relations and root architecture. This work will
provide knowledge and new QTL to aid in the
development of wheat varieties adapted to low
input production systems, which are favoured in
Europe due to low market prices and increasing
environmental concerns. The position will be
based at UMR EGC INRA/INA-PG, laboratory
specialised in C and N interactions at plant and
crop level, at Grignon, located 40 km West of
Paris. The appointee will spend short periods in
INRA Genetics and Breeding units in Rennes and
Description: A population of di-haploid (DH)
lines was produced from the cross between 'Arche'
and 'Récital', two varieties contrasted for their
tolerance in N deficiency. QTL for N stress
reaction were detected in the field. A sample of
the DH lines was also grown at low N level under
controlled conditions. To find pertinent
parameters to explain N response, a simplified
conceptual plant model was used to analyse N
absorption in relation to C assimilation. It
appeared that the most variable model parameter
was N uptake rate computed as the ratio between
total plant N and cumulated root length. A QTL
detection was carried out on state variables and
on model parameters to identify interesting
chromosomic regions. We were however not able to
take into account the relation between root
biomass and architecture that is known to be a
major mechanism of adaptation to mineral
We propose to further investigate wheat N
deficiency tolerance under controlled conditions.
The appointee will adapt an Arabidopsis model on
wheat to take into account the response of root
architecture to the C and N environment of the
plant. He/she will then test a population of DH
lines in controlled conditions to perform a QTL
detection on parameters of the model. He/she will
validate the QTL and the model by predicting and
testing the behaviour of allelic compositions.
Qualifications and experience:
Required: Ph. D. in plant or crop physiology
Training in modelling, and in biometric analyses.
Demonstrated ability to publish papers in
refereed international journals.
Preferred: Experience with QTL analysis will be appreciated.
Terms: appointment for 12 months.
Starting date: between 1st Jan and 1st April 2007.
Salary: around 2100 ¤/month
Laperche A, M Brancourt-Hulmel, E Heumez, O
Gardet, J Le Gouis (2006) Estimation of genetic
parameters of a DH wheat population grown at
different N stress levels characterized with
probe genotypes. Theor. Appl. Genet. 112:797-807.
Laperche A, M Brancourt-Hulmel, E Heumez, E
Hanocq, F Devienne-Barret, J Le Gouis (2007)
Using genotype x nitrogen interaction variables
to evaluate the QTL involved in wheat tolerance
to nitrogen constraints. Theor. Appl. Genet.
Laperche A, F Devienne-Barret, O Maury, J Le
Gouis, B Ney (2006) A simple conceptual framework
of carbon and nitrogen relationship for QTL
analysis of winter wheat adaptation to nitrogen
deficiency. Theor. Appl. Genet. 113:131-1146
Le Gouis J, D Beghin, E Heumez, P Pluchard.
(2000) Genetic differences for nitrogen uptake
and nitrogen utilisation efficiencies in winter
wheat. Eur. J. Agron. 12:163-173
Send (e-mail is acceptable): 1) a letter of
application discussing how the stated
qualifications are met; 2) a detailed curriculum
vitae; 3) a list of publications and 4) names and
addresses (including phone and e-mail) of three
current references, to:
Science du Végétal
65, rue de Saint-brieuc - CS 84215
35042 Rennes cedex
tél : (00 33) +2 23 48 56 84
fax : (00 33) +2 23 48 54 80
e-mail : Anne.Laperche At agrocampus-rennes.fr
ney At agroparistech.fr
Professeur à AGROPARISTECH UMR INRA
AgroParisTech Environnement et Grandes cultures
UMR EGC, 78850 Thiverval Grignon, France
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