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Objectif végétal : une dynamique partenariale

Separated by coma

Seed maturation/conservation

When the seed perceives a pathogenic agent, there is a trade-off between the activation of its basal defences and its own development:

Activation of genes involved in the establishment of defence mechanisms

Slowdown of seed maturation process (reduction of the TKW and chlorophyll retention)

Proteic and biochemical molecular markers for seed maturity and longevity have been identified in field crop and vegetable crop species:

  • LEA proteins (Late Embyogenesis Abudant)
  • Sucrose/oligosaccharides ratio

Some genes involved in defence mechanisms have been shown to regulate seed longevity.

Approaches of gene co-expression networks were developed to:

  • Decipher the molecular bases of seed vigour acquisition, and thus identify the key regulator genes that have been conserved between species
  • Better understand the seed development dynamic in optimal and stressful conditions

 

 

Olivier Leprince
                 Professor, Agrocampus-Ouest,

team ConcerTo, UMR IRHS
olivier.leprince @ agrocampus-ouest.fr

 

                            

Seedling establishment

Exploration of genetic diversity enabled to identify the key physiological characteristics of hypocotyl for successful sprout in abiotic stress conditions:

  • The high number of cells in the embryo
  • The high ability  for cell lengthening in disadvantageous conditions

QTL were identified for these characteristics.

Identification of a membrane transporter that regulates nitrate absorption and root architecture in seedlings.

 

Béatrice Teulat
Teacher-researcher, Agrocampus-Ouest,
leader of SESaN team, UMR IRHS

beatrice.teulat @ agrocampus-ouest.fr

 

Anis Limami
Teacher-researcher, Angers University,
team SESaN, UMR IRHS
anis.limami @ univ-angers.fr

 

 

These investigations are done thanks to the shared

equipements of SFR QUASAV  :

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