Display Settings:

Format

Send to:

Choose Destination
We are sorry, but NCBI web applications do not support your browser and may not function properly. More information
Ann Bot. 2007 Aug;100(2):261-70. Epub 2007 Jun 11.

Cytological investigations of the Arabidopsis thaliana elo1 mutant give new insights into leaf lateral growth and Elongator function.

Author information

  • 1Università della Calabria, Dipartimento di Ecologia, Via ponte P. Bucci, Cubo 6B, I-87036, Arcavacata di Rende, CS, Italia. andrea.falcone@unical.it

Abstract

BACKGROUND AND AIMS:

Leaf growth is a complex developmental process controlled by genetic and environmental factors and is determined by a proliferation, expansion and maturation phase. Mutational analysis in Arabidopsis thaliana showed that leaf size and shape is dependent on cell division and cell expansion activity. An investigation was made at the cytophysiological and ultrastructural level of the elo1 mutant of Arabidopsis thaliana, which is defective in one of the components of the histone acetyl transferase Elongator complex and displays a distinct 'narrow leaves' phenotype, owing to a reduced cell number and no transition between petiole and lamina. Relative expression levels of three sucrose metabolism/transport-related genes were also investigated. The aim was to determine the physiological basis of leaf morphology in this mutant, by investigating the modulatory role of sucrose.

METHODS:

The elo1 mutant was taken as representative of all the elo mutations and investigated at cytophysiological level. A germination test and growth assays were performed on seedlings grown for 21 d at different sucrose concentrations. Leaf morphometric and ultrastructural features were also investigated by image analysis and electron microscopy, respectively. Finally, a quantitative PCR (qPCR) analysis was performed with three sucrose metabolism/transport-related genes that were investigated under different sucrose concentrations.

KEY RESULTS:

elo1 plants at high sucrose concentrations exhibited an enhancement of germination and inhibition of leaf growth as compared with wild-type plants. qPCR experiments with three sucrose metabolism/transport-related genes showed an interaction between sucrose availability and the elo1 mutation. Furthermore, electron microscopy analysis provided the first ultrastructural description of an elo mutant, which showed a hypotonic vacuole, alterations in the size of grana and starch grains in the chloroplasts, and the massive presence of Golgi vesicles in the cytoplasm.

CONCLUSIONS:

Based on the results obtained it is proposed that mechanisms producing carbon assimilates or importing sucrose could be affected in elo1 plants and could account for the observed differences, implying a role for Elongator in the regulation of these processes.

PMID:
17565971
[PubMed - indexed for MEDLINE]
PMCID:
PMC2735317
Free PMC Article

Images from this publication.See all images (7)Free text

F ig . 1.
F ig . 2.
F ig . 3.
F ig . 4.
F ig . 5.
F ig . 6.
F ig . 7.
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for HighWire Icon for PubMed Central
    Loading ...
    Write to the Help Desk