Results suggest that the genomes uncoupled 1 (GUN1) and genomes uncoupled 5 (GUN5)-involved plastid-to-nucleus retrograde communication played a role in regulating acetyl-CoA carboxylase 2 (ACC2).
Findings reveal an auto-adaptation loop pathway that plant cells optimize particular needs of chloroplasts in stabilizing photosynthetic complexes by relaying the GUN5-dependent plastid signal(s) to activate the heat-responsive expression of HSP21 in the nucleus during adaptation to heat stress in plants.
OST1 functions downstream of ABAR in abscisic acid receptor signalling in guard cells. Consistent with this ABAR protein is phosphorylated but independently of the OST1 protein kinase.
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