AUXIN-MEDIATED ALTERATIONS OF ROOT
ARCHITECTURE DURING ABIOTIC STRESS
ADAPTATION
Low-temperature stress
During gravitropic responses, asymmetrical localization of
auxin to one side of the cell through the action of auxin transport
proteins, in particular PINs, redirects the root growth towards
the centre of gravity (Friml, 2010). Exposure of roots to cold
inhibits such gravity responses in arabidopsis (Rahman, 2013).
In cold-exposed root cells, trafficking and lateral localization
of the auxin efflux proteins PIN2 and PIN3 is inhibited until
the seedlings are returned to normal growth temperatures
(Shibasaki et al., 2009). Possible roles of auxin as a regulator
of cold stress responses of arabidopsis have recently been
reviewed (Rahman, 2013) and will not be discussed here in
detail.