New insights into the control of endoreduplication: endoreduplication could be driven by organ growth in Arabidopsis leaves.
Enormous progress has been achieved understanding the molecular mechanisms regulating endoreduplication. By contrast, how this process is coordinated with the cell cycle or cell expansion and contributes to overall growth in multicellular systems remains unclear. A holistic approach was used here to give insight into the functional links between endoreduplication, cell division, cell expansion, and whole growth in the Arabidopsis (Arabidopsis thaliana) leaf. Correlative analyses, quantitative genetics, and structural equation modeling were applied to a large data set issued from the multiscale phenotyping of 200 genotypes, including both genetically modified lines and recombinant inbred lines. All results support the conclusion that endoreduplication in leaf cells could be controlled by leaf growth itself. More generally, leaf growth could act as a "hub" that drives cell division, cell expansion, and endoreduplication in parallel. In many cases, this strategy allows compensations that stabilize leaf area even when one of the underlying cellular processes is limiting.
Laboratoire d'Ecophysiologie des Plantes sous Stress Environnementaux UMR 759, INRA/SUPAGRO, F-34060 Montpellier cedex 1, France.
Catherine
C
Massonnet
Sébastien
S
Tisné
Amandine
A
Radziejwoski
Denis
D
Vile
Lieven
L
De Veylder
Myriam
M
Dauzat
Christine
C
Granier
D017360:Arabidopsis / Q000166:cytology* / Q000235:genetics / Q000254:growth & development; D002455:Cell Division; D049108:Cell Enlargement; D002874:Chromosome Mapping; D020440:Gene Duplication; D005838:Genotype; D015999:Multivariate Analysis; D009154:Mutation; D010641:Phenotype; D018515:Plant Leaves / Q000166:cytology* / Q000235:genetics / Q000254:growth & development; D030821:Plants, Genetically Modified; D011003:Ploidies; D040641:Quantitative Trait Loci; D020133:Reverse Transcriptase Polymerase Chain Reaction