Geoscience Reference
In-Depth Information
Effect of climate change
Abiotic stress
Biotic stress
Hormonal induction
Induction of transcription
factor/co-factor/
co-activator/repressor
Activation of genomics re-programming
SAGA
Mediator
TFIID
POL-II
TAF1
T
B
P
TATA
INR
Stress-inducible gene
Stress adaptation
Cis
-regulatory elements
FIGURe 13.3
(
See colour insert.
) A model describing the coordination of different
types of transcriptional regulatory complex in plant gene expression in the con-
text of climate change. Various transcription factor/co-factor/co-activator/repres-
sor was induced during stress condition and controls the stress-responsive gene
expression.
Cis
-regulatory elements are also involved in stress-responsive tran-
scription shown in different shapes at the proximal promoter.
yeast has revealed that TAFs regulate about 70% of whole-
gene expression (Lee et al., 2000). Recently, plant TAFs are
becoming the subject of intensive study (Lago et al., 2004,
2005; Bertrand et al., 2005; Furumoto et al., 2005; Benhamed
et al., 2006; Gao et al., 2006; Tamada et al., 2007; Kubo et al.,
2011; Mougiou et al., 2012), and their molecular and physi-
ological functions in response to stress, development and dif-
ferentiation are being progressively revealed. Modifications in
the levels of
Arabidopsis
-speciic TAFs are implicated in plant
development affecting the organisation of shoot apical meri-
stems, leaf development, formation of floral organs and leaves,
fertility, pollen tube growth and light responses (Gurley et al.,
2006). Mutations in TAF1a regulate light-responsive genes
by controlling acetylation of histones H3 and H4 at the tar-
get promoters (Bertrand et al., 2005; Benhamed et al., 2006).
Arabidopsis
TAF6 plays an important role in the pollen tube
