Metabolism means the process of synthesizing and degrading of intracellular components. Under stress conditions, the activity of metabolism is altered in order to salvage nutrients and adapt to the environment. Our previous research has shown that the enzyme responsible for salvaging phosphate from phospholipids contributes to plant growth not only during phosphate starvation, but also nitrogen starvation (Yoshitake et al., 2017). Additionally, we have found that autophagy, a process for degradation of  intracellular components, plays a role in salvaging phosphate by degrading plastids or endoplasmic reticulum (Yoshitake et al., 2021, 2022). Our goal is to understand the regulation of these phenomena.