INVESTIGADORES
MORICONI Jorge Ignacio
congresos y reuniones científicas
Título:
Nitric Oxide impairs zinc uptake and mobilization in wheat plants
Autor/es:
BUET A; MORICONI JI; SANTA-MARÍA GE; SIMONTACCHI M
Lugar:
Buenos Aires
Reunión:
Congreso; VIII meeting of the society for free radical biology and medicine South American Group (VIII ); 2013
Resumen:
Nitric oxide impairs Zinc uptake and
mobilization in wheat plants
Buet1
A., Moriconi2 J., Santa María2 GE., Simontacchi1
M.
1INFIVE, UNLP-CONICET, La Plata, Buenos Aires,
Argentina. 2INTECH, UNSAM-CONICET, Chascomús, Buenos Aires, Argentina
The effect
of nitric oxide (NO), applied as S-nitrosoglutathione (GSNO), on Zn nutrition
was evaluated in hydroponically cultured wheat plants (Triticum aestivum cv. Chinese Spring).
At
supraoptimal external Zn-concentrations, the concentration of Zn in plants was
negatively affected by the presence of 100 µM GSNO. Zn concentration in roots declined
from 92±16 to 54±8 nmol g-1 FW, after 17 days of treatment, while in
shoots it declined from 117±9 to 79±7 nmol g-1 FW.
When plants
were exposed for 17 days to Zn deprivation, and then transferred to a complete nutritive
solution for 48 h, net Zn uptake rate (NUR) was 4-fold higher than that measured
for plants maintained in a complete nutrient solution. However, in Zn starved
plants, the presence of NO for 48 h precluded these increase in NUR.
Additionally,
root-to-shoot Zn-translocation rate in plants suffering from Zn deficiency (3,1
nmol Zn g-1 FW h-1) markedly decreased by the presence of
100 µM GSNO in the nutrient solution (1,5 nmol Zn g-1 FW h-1).
Our results
suggest a role for NO in the modulation of Zn uptake and in root-to-shoot movement
when plants are cultured under different Zn availability.