INVESTIGADORES
LAGORIO MarÍa Gabriela
congresos y reuniones científicas
Título:
Effect of Phosphorous deficiency on chlorophyll fluorescence of cotyledon and root exudates of rape
Autor/es:
YARYURA, P; CORDON, G.; LEÓN, M.; RUBIO, G.; KERBER, N.; PUCHEU, N.; GARCÍA, A.; LAGORIO, M. G.
Lugar:
Mar del Plata, Argentina
Reunión:
Congreso; XLIII Reunión anual de la Sociedad Argentina de Investigación en Bioquímica y Biología; 2007
Institución organizadora:
Sociedad Aregentina de Investigación en Bioquímica y Biología
Resumen:
PL-P58.
EFFECT OF PHOSPHOROUS DEFICIENCY ON
CHLOROPHYLL FLUORESCENCE OF COTYLEDON
AND ROOT EXUDATES OF RAPE
Yaryura P1 2 1 1 1 1
1 2
1 2
, Cordon GB , LeónM , RubioG , Kerber N , Pucheu N ,
GarcíaA , LagorioMG
IBYF (CONICET), FAUBA; DQIA y QF/ INQUIMAE, FCEN,
UBA. E-mail: yaryura@agro.uba.ar
Brassica rapa
.
The study of the spectroscopic properties is a non destructive
procedure monitoring energy transfer and, consequently, plant
health. In particular, Chlorophyll-a fluorescence (Chl-F) emitted
by leaves brings information concerning the plants response to
external factors. Cotyledons of rape ( L.) young
plants under phosphorous (P) deficiency showed a Chl-F ratio in
the red/far red region (F685/F737) lower than the corresponding
value for non-stressed plants. Moreover, minimal differences in
F685/F740 were detected in leaves. These results showed that P
deficiencies may better be detected by measuring changes in Chl-F
emission in cotyledons than in leaves. Stressed cotyledons showed
different emission spectra in the blue-green (maxima at 469 and
555 nm) compared to non-stressed cotyledons. The use of the
spectroscopic correction, as described by Cordon et al.
(Photochem. Photobiol. Sci., 2006, 5, 735-740), allowed us to
present here F spectra that are not distorted by differential energy
absorption by pigments. On the other hand, we also studied the F in
root exudates emitting approximately at 410nmin both the stressed
and non-stressed plants. The intensity of those emission signals are
identical in stressed and non-stressed plants.