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[Ecophysiology] post doctoral position

ney At bcgn.grignon.inra.fr via ecophys%40net.bio.net (by ney At bcgn.grignon.inra.fr)
Fri Jan 26 08:28:54 EST 2007

Dear colleagues:
Please distribute this information to potential students.

  [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

To apply:
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:

Anne Laperche
Science du Végétal
Agrocampus Rennes
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

Bertrand NEY
ney At agroparistech.fr

Professeur à AGROPARISTECH               UMR INRA 
AgroParisTech Environnement et Grandes cultures

UMR EGC, 78850 Thiverval Grignon, France
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