INVESTIGADORES
CABELLO Julieta Virginia
artículos
Título:
The homologous homeodomain-leucine zipper transcription factors HaHB1 and AtHB13 confer tolerance to drought and salinity stresses via the induction of proteins that stabilize membranes
Autor/es:
CABELLO JV; CHAN, RL
Revista:
PLANT BIOTECHNOLOGY JOURNAL
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2012
ISSN:
1467-7644
Resumen:
Transgenic
approaches to conferring tolerance to abiotic stresses have mostly
resulted in some degree of plant yield penalty under normal or mild
stress conditions. Recently, we have reported that the
homeodomain-leucine zipper transcription factors HaHB1 and AtHB13 were
able to confer tolerance to freezing temperatures via the induction of
glucanase (GLU and PR2) and chitinase (PR4) proteins. In the present
study we show that the expression of these transcription factors, as
well as that of their putative targets AtPR2, AtPR4 and AtGLU,
is up-regulated by drought and salinity stresses. Transgenic plants
overexpressing separately these five genes exhibited tolerance to severe
drought and salinity stresses, displaying a cell membrane stabilization
mechanism. Under normal or mild stress conditions, these plants
achieved an improved yield associated with a higher chlorophyll content.
Moreover, overexpression of the sunflower HaHB1
gene from its own, inducible, promoter conferred a high drought stress
tolerance without yield penalty under normal or mild stress conditions.
We propose these transcription factors as potential biotechnological
tools to breed crops for tolerance to multiple stresses and for
increased yield.