IBR   13079
INSTITUTO DE BIOLOGIA MOLECULAR Y CELULAR DE ROSARIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Flavodoxin, a biotechnological tool for the generation of multiple-tolerant crops
Autor/es:
MATIAS D. ZURBRIGGEN; VANESA B. TOGNETTI; ESTELA M. VALLE; JOCHEN KUMLEHN; NÉSTOR CARRILLO; MOHAMMAD R. HAJIREZAEI
Lugar:
Gatersleben, Alemania
Reunión:
Conferencia; IV Plant Science Students Conference 2008; 2008
Resumen:
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Plants
growing under natural conditions unavoidably face episodic situations of
environmental stress in the course of their life times. They have developed
numerous strategies to survive in such adverse conditions. Crops, instead, are
selected by humans for their high productivity in agriculture, but this is
usually not accompanied by increased resistance to hostile environments
(diseases, unfavorable climates or inappropriate soils) that are responsible
for most agricultural losses. Oxidative stress leads
to decreased levels of the electron transport protein ferredoxin (Fd). Under
these conditions, cyanobacteria and some algae induce the synthesis of the
flavoprotein flavodoxin (Fld), which can provide a functional substitution of
Fd in many of its crucial functions in the chloroplasts. Transgenic tobacco
plants expressing Anabaena Fld in
chloroplasts displayed enhanced tolerance to oxidative stress conditions and
iron deficiency. Transformation of related Solanaceae
(tomato, potato) yielded essentially the same tolerant phenotypes when
challenged with the redox cycling herbicide paraquat and exposed to drought
conditions. Protocols to incorporate Fld into several other crops, including
cereals and Brassicaceae are
currently under way. The Fld gene-based strategy could be a useful
biotechnological tool to improve crop yields and to gain at least some
wastelands for agriculture.