Book of Abstracts - Geyseco

FESPB 2010 - XVII Congress of the Federation of European Societies of Plant Biology
Bagniewska-Zadworna, A. 1 * - Byczyk, J. 1 - Zadworny, M. 2
1
Department of General Botany, Institute of Experimental Biology,
Adam Mickiewicz University
2
Laboratory of Root System Pathology, Institute of Dendrology,
Polish Academy of Science
*Corresponding author e-mail: agabag@amu.edu.pl
The function of the roots is partially exhibited by their anatomical
structure. The aim of the experiments was to investigate the
diverse of the new developing fine and pioneer roots to determine
their functional structural design. The daily root growth rate in
the relation to the weather conditions was examined in the field
conditions, using root boxes. Since the function of pioneer roots
is not well known, it is important to verify their character and
the nature of relationship between growth speed and histological
arrangement. In general pioneer roots are attributed to play
structural function whereas fibrous are responsible for water and
nutrient absorption. The anatomical structure separated these two
classes of roots. Pioneer and fibrous roots significantly varied for
basic of the parameters analyzed. We found that the root and stele
diameters, proportions between stele and cortex as well as archic
structure ranged between fine and pioneer roots. The cytological
analysis aimed also to examine the xylogenesis process in those
two types of roots of the known age. Anatomical construction of
apical first root order confirmed that these two classes of roots,
varied in absorptive ability, even if produced by the same plant. It
seems that black cottonwood might generate more pioneer roots
to forage for nutrient rich areas at large soil distance and then
specifically “install” fine roots. Since those results are only preliminary,
it will be necessary to study how flexible pioneer roots
of different plants could be in response nutrient rich zones or
investigate why the same species produces functionally diverse
lateral roots.
Acknowledgement This work was supported by grant no.
NN309007437 from the Polish Ministry of Science and
Higher Education.
P06-014: IDENTIFICATION OF THE MOLECULAR
COMPONENTS OF THE AUXIN-CYTOKININ INTERAC-
TION DURING LATERAL ROOT ORGANOGENESIS
Vanstraelen, M.* - Duclercq, J. - Naouar, N. - Parizot, B. -
Benková, E.
VIB Dept. of Plant Systems Biology, UGent, Gent, Belgium
*Corresponding author e-mail: mastr@psb.ugent.be
Lateral root organogenesis in Arabidopsis is governed by a complex
network of hormonal regulations.
The plant hormones auxin and cytokinin have been demonstrated
to act as key regulators of lateral root organogenesis and their
mode of interaction is antagonistic. To identify novel molecular
components regulating auxin-cytokinin interaction, we used
transcript profiling on sorted pericycle cells after treatment with
auxin, cytokinin or both. Of the 29666 genes analyzed, 3172,
1457 and 3660 were differentially regulated (FC>1.5 or