INVESTIGADORES
ROSA Mariana Daniela
artículos
Título:
Leaves of Citrus aurantifolia exhibit a different sensibility to solar UV-B radiation according to development stage in relation to photosynthetic pigments and UV-B absorbing compounds production
Autor/es:
IBÁÑEZ, SILVINA; ROSA, MARIANA; HILAL, MIRNA; GONZÁLEZ, JUAN ANTONIO; PRADO, FERNANDO
Revista:
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
Editorial:
Elsevier
Referencias:
Año: 2008 vol. 90 p. 163 - 169
ISSN:
1011-1344
Resumen:
Plants of Citrus aurantifolia grown in a greenhouse without solar UV radiation (UVR) were transferred outdoors to evaluate the effect
of solar UV-B radiation (UVBR, 280315 nm) in prior-developed leaves, constituted by apical bud and those fully expanded before being
taken outdoors, and post-developed leaves, formed by those expanded outdoors. Results demonstrated that over a 40 d outdoor period
leaf chlorophyll content and distribution pattern were different with and without solar UVBR. Chlorophyll a, chlorophyll b and total
chlorophyll contents in both treatments were higher in prior-developed leaves than in post-developed ones. However, highest values were
observed in prior-developed leaves under solar UVBR, whereas in post-developed leaves an opposite trend was observed. Carotenoids
content in prior-developed leaves was higher with solar UVBR, whereas in post-developed leaves there were no significant differences in
both with and without solar UVBR. In addition, prior-developed leaves under solar UVBR accumulated flavonoids, but not anthocyanins.
Growth parameters (e.g. DW, DW/FW ratio, LMA, plant height, length and width of foliar lamina) did not show significant differences
between plants grown with and without solar UVBR. Thus, our results demonstrated that C. aurantifolia leaves exhibited a
different sensibility to solar UVBR according to development stage in relation to photosynthetic pigments and UV-B absorbing compounds
production. In addition, the solar UVBR was not necessary as inductor of photosynthetic protection mechanisms in a short-time
growth period. On the other hand, our results also demonstrated that solar UVBR acted as an effective feeding deterrent against citrus
leafminer.Citrus aurantifolia grown in a greenhouse without solar UV radiation (UVR) were transferred outdoors to evaluate the effect
of solar UV-B radiation (UVBR, 280315 nm) in prior-developed leaves, constituted by apical bud and those fully expanded before being
taken outdoors, and post-developed leaves, formed by those expanded outdoors. Results demonstrated that over a 40 d outdoor period
leaf chlorophyll content and distribution pattern were different with and without solar UVBR. Chlorophyll a, chlorophyll b and total
chlorophyll contents in both treatments were higher in prior-developed leaves than in post-developed ones. However, highest values were
observed in prior-developed leaves under solar UVBR, whereas in post-developed leaves an opposite trend was observed. Carotenoids
content in prior-developed leaves was higher with solar UVBR, whereas in post-developed leaves there were no significant differences in
both with and without solar UVBR. In addition, prior-developed leaves under solar UVBR accumulated flavonoids, but not anthocyanins.
Growth parameters (e.g. DW, DW/FW ratio, LMA, plant height, length and width of foliar lamina) did not show significant differences
between plants grown with and without solar UVBR. Thus, our results demonstrated that C. aurantifolia leaves exhibited a
different sensibility to solar UVBR according to development stage in relation to photosynthetic pigments and UV-B absorbing compounds
production. In addition, the solar UVBR was not necessary as inductor of photosynthetic protection mechanisms in a short-time
growth period. On the other hand, our results also demonstrated that solar UVBR acted as an effective feeding deterrent against citrus
leafminer.a, chlorophyll b and total
chlorophyll contents in both treatments were higher in prior-developed leaves than in post-developed ones. However, highest values were
observed in prior-developed leaves under solar UVBR, whereas in post-developed leaves an opposite trend was observed. Carotenoids
content in prior-developed leaves was higher with solar UVBR, whereas in post-developed leaves there were no significant differences in
both with and without solar UVBR. In addition, prior-developed leaves under solar UVBR accumulated flavonoids, but not anthocyanins.
Growth parameters (e.g. DW, DW/FW ratio, LMA, plant height, length and width of foliar lamina) did not show significant differences
between plants grown with and without solar UVBR. Thus, our results demonstrated that C. aurantifolia leaves exhibited a
different sensibility to solar UVBR according to development stage in relation to photosynthetic pigments and UV-B absorbing compounds
production. In addition, the solar UVBR was not necessary as inductor of photosynthetic protection mechanisms in a short-time
growth period. On the other hand, our results also demonstrated that solar UVBR acted as an effective feeding deterrent against citrus
leafminer.C. aurantifolia leaves exhibited a
different sensibility to solar UVBR according to development stage in relation to photosynthetic pigments and UV-B absorbing compounds
production. In addition, the solar UVBR was not necessary as inductor of photosynthetic protection mechanisms in a short-time
growth period. On the other hand, our results also demonstrated that solar UVBR acted as an effective feeding deterrent against citrus
leafminer.
2008 Elsevier2008 Elsevier