INVESTIGADORES
SILVA Maria Fernanda
artículos
Título:
Abscisic acid is involved in the response of grape (Vitis
Autor/es:
BERLI, FEDERICO; MORENO, DANIELA; PICCOLI,PATRICIA; HESPANHOL-VIANA, LEANDRO; SILVA, MARÍA FERNANDA; BRESSAN-SMITH, RICARDO; CAVAGNARO, BRUNO; BOTTINI, RUBÉN
Revista:
PLANT, CELL AND ENVIRONMENT (PRINT)
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Año: 2010 vol. 33 p. 1 - 10
ISSN:
0140-7791
Resumen:
We investigated the interactions of abscisic acid (ABA) in
the responses of grape leaf tissues to contrasting ultraviolet
(UV)-B treatments. One-year-old field-grown plants of
Vitis vinifera L. were exposed to photosynthetically active
radiation (PAR) where solar UV-B was eliminated by
using polyester filters, or where PAR was supplemented
with UV-B irradiation. Treatments combinations included
weekly foliar sprays of ABA or a water control. The levels
of UV-B absorbing flavonols, quercetin and kaempferol
were significantly decreased by filtering out UV-B, while
appliedABA increased their content. Concentration of two
hydroxycinnamic acids, caffeic and ferulic acids, were also
increased by ABA, but not affected by plus UV-B (+UV-B)
treatments. Levels of carotenoids and activities of the
antioxidant enzymes, catalase, ascorbate peroxidase and
peroxidase were elevated by +ABA treatments, but only
if +UV-B was given. Cell membrane b-sitosterol was
enhanced by ABA independently of +UV-B. Changes in
photoprotective compounds, antioxidant enzymatic activities
and sterols were correlated with lessened membrane
harm by UV-B, as assessed by ion leakage. Oxidative
damage expressed as malondialdehyde content was
increased under +UV-B treatments.Our results suggest that
the defence system of grape leaf tissues against UV-B is
activated by UV-B irradiation with ABA acting downstream
in the signalling pathway.L. were exposed to photosynthetically active
radiation (PAR) where solar UV-B was eliminated by
using polyester filters, or where PAR was supplemented
with UV-B irradiation. Treatments combinations included
weekly foliar sprays of ABA or a water control. The levels
of UV-B absorbing flavonols, quercetin and kaempferol
were significantly decreased by filtering out UV-B, while
appliedABA increased their content. Concentration of two
hydroxycinnamic acids, caffeic and ferulic acids, were also
increased by ABA, but not affected by plus UV-B (+UV-B)
treatments. Levels of carotenoids and activities of the
antioxidant enzymes, catalase, ascorbate peroxidase and
peroxidase were elevated by +ABA treatments, but only
if +UV-B was given. Cell membrane b-sitosterol was
enhanced by ABA independently of +UV-B. Changes in
photoprotective compounds, antioxidant enzymatic activities
and sterols were correlated with lessened membrane
harm by UV-B, as assessed by ion leakage. Oxidative
damage expressed as malondialdehyde content was
increased under +UV-B treatments.Our results suggest that
the defence system of grape leaf tissues against UV-B is
activated by UV-B irradiation with ABA acting downstream
in the signalling pathway.+UV-B)
treatments. Levels of carotenoids and activities of the
antioxidant enzymes, catalase, ascorbate peroxidase and
peroxidase were elevated by +ABA treatments, but only
if +UV-B was given. Cell membrane b-sitosterol was
enhanced by ABA independently of +UV-B. Changes in
photoprotective compounds, antioxidant enzymatic activities
and sterols were correlated with lessened membrane
harm by UV-B, as assessed by ion leakage. Oxidative
damage expressed as malondialdehyde content was
increased under +UV-B treatments.Our results suggest that
the defence system of grape leaf tissues against UV-B is
activated by UV-B irradiation with ABA acting downstream
in the signalling pathway.+ABA treatments, but only
if +UV-B was given. Cell membrane b-sitosterol was
enhanced by ABA independently of +UV-B. Changes in
photoprotective compounds, antioxidant enzymatic activities
and sterols were correlated with lessened membrane
harm by UV-B, as assessed by ion leakage. Oxidative
damage expressed as malondialdehyde content was
increased under +UV-B treatments.Our results suggest that
the defence system of grape leaf tissues against UV-B is
activated by UV-B irradiation with ABA acting downstream
in the signalling pathway.+UV-B was given. Cell membrane b-sitosterol was
enhanced by ABA independently of +UV-B. Changes in
photoprotective compounds, antioxidant enzymatic activities
and sterols were correlated with lessened membrane
harm by UV-B, as assessed by ion leakage. Oxidative
damage expressed as malondialdehyde content was
increased under +UV-B treatments.Our results suggest that
the defence system of grape leaf tissues against UV-B is
activated by UV-B irradiation with ABA acting downstream
in the signalling pathway.+UV-B. Changes in
photoprotective compounds, antioxidant enzymatic activities
and sterols were correlated with lessened membrane
harm by UV-B, as assessed by ion leakage. Oxidative
damage expressed as malondialdehyde content was
increased under +UV-B treatments.Our results suggest that
the defence system of grape leaf tissues against UV-B is
activated by UV-B irradiation with ABA acting downstream
in the signalling pathway.+UV-B treatments.Our results suggest that
the defence system of grape leaf tissues against UV-B is
activated by UV-B irradiation with ABA acting downstream
in the signalling pathway.