IQUIFIB   02644
INSTITUTO DE QUIMICA Y FISICOQUIMICA BIOLOGICAS "PROF. ALEJANDRO C. PALADINI"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Nitrogen is essential in the response of Triticum aestivum L. to cadmium or polyamines exposure.
Autor/es:
ELIANA P ROSALES; PENA L.B.; M.S. ZAWOZNIK; GALLEGO S.M.; GROPPA M.D.; BENAVIDES M.P.
Lugar:
Edinburgh
Reunión:
Encuentro; 4th Plant NO Club International Meeting; 2012
Resumen:
Nitrogen is an essential nutrient during plant growth and nitrate reductase (NR), responsible for nitrate reduction, is involved in the generation of nitric oxide (NO) in plants. The tetramine spermine (Spm), as well as cadmium (Cd) reduced wheat root growth by increasing NO formation. The aim of this work was studying the importance of nitrogen level and NO formation in plants exposed to Cd, putrescine (Put) or Spm. Seeds were germinated and then transferred to a growth medium with (N+) or without (N-) nitrogen. Cadmium (0.1 mM), Put or Spm (1mM) were added. After 5 days, no differences in growth were observed in control plants grown with or without N. However, the growth of Cd or Spm-treated plants were significantly less affected in N- media, while Put reduced root and shoot growth more in the medium with N. In roots, NR activity was inhibited to a different degree in all stress grown conditions, but in shoots, it was increased about 100% in Cd or Spm-treated plants grown without N. The presence of N clearly increased NO content in the apical part of the roots, compared to plants grown in N free medium. The importance of N for growing under stress, as well as NO as a signal molecule in the regulation of plant growth is discussed.