IIB   20738
INSTITUTO DE INVESTIGACIONES BIOLOGICAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Jasmonic acid, root growth and its relation with auxins in sunflower seedlings
Autor/es:
CORTI MONZÓN G, LAMATTINA L, DE LA CANAL L
Lugar:
San Miguel de Tucumán, Argentina
Reunión:
Congreso; XLV Reunión Anual de la Sociedad Argentina de Investigación en Bioquímica y Biología Molecular; 2009
Resumen:
The jasmonates
are naturally occurring in plants and have been accepted as a new kind
of plant hormone. They act as signal molecules in plant defense and
influence several aspects of plant growth and development, including
root growth in certain species. The objective of this work was to
investigate the effects of the jasmonic acid (JA) on the primary root
length (PRL) in Helianthus annuus seedlings. Seedlings were
treated hydroponically during four days with different combinations of
JA, ibuprofen or salicylhydroxamic acid (IBU and SHAM, inhibitors of JA
synthesis), NAA (an auxin) and NPA (an auxins transport inhibitor) and
the effect on PRL was analyzed. The application of JA decreased the
primary root growth in a dose-dependent way and the treatment with
inhibitors of JA synthesis increased PRL, indicating that not only the
exogenous but also the endogenous JA regulate the PRL. As auxins also
inhibit the primary root growth, a possible interaction between JA and
auxins was analyzed. Exogenous JA produced its phenotype even in the
presence of reduced levels of auxins generated by treatment with NPA,
and NAA produced its phenotype even in the presence of reduced levels
of JA generated by treatment with IBU or SHAM. Therefore, these results
indicate that the JA-induced primary root inhibition is independent of
auxins in sunflower seedlings