Plastid Signals Confer Arabidopsis Tolerance to Water Stress

Antagonistic modules, SIB1 and LSD1, regulate photosynthesis-associated nuclear genes via GOLDEN2-LIKE transcription factors in Arabidopsis

“…Our findings also raise a plausible idea that GUN1-mediated RS would largely contribute to plant stress responses because the signaling primarily represses the expression of GLK1 and GLK2 once the foliar plastid function is interrupted (see introduction). Consistently, gun1 mutant plants exhibit an increased susceptibility towards heat, water, drought, cold, and high-light stresses with enhanced cellular ROS levels (Cheng et al, 2011; Miller et al, 2007; Tang et al, 2014; Zhang et al, 2013; Zhang et al, 2011). The multifaceted interactions between GLK1/2 and the antagonistic modules nuSIB1 and LSD1, as well as other stress-related proteins, may be accountable for the altered gun1 phenotype to various stress factors.…”

“…This notion also raises a plausible idea that GUN1-mediated RS, which transcriptionally represses PhANGs, may further facilitate plant stress/acclimation responses. Consistently, loss of GUN1 compromises the plant resistance towards heat, water, drought, cold, and high-light stresses 39–43 . Moreover, gun1 mutant plants exhibit an increased level of ROS under these stress conditions 39,41,43 .…”

“…Consistently, loss of GUN1 compromises the plant resistance towards heat, water, drought, cold, and high-light stresses 39–43 . Moreover, gun1 mutant plants exhibit an increased level of ROS under these stress conditions 39,41,43 . However, how the GUN1-mediated RS facilitates plant stress tolerance remained an enigma.…”