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