Beyond iron-storage pool: functions of plant apoplastic iron during stress

Iron (Fe) is an essential micronutrient for plants, and its storage in the apoplast represents an important Fe pool. Plants have developed various strategies to re-utilize this apoplastic Fe pool to adapt to Fe deficiency. In addition, growing ev-idence indicates that the dynamic changes in apoplastic Fe are critical for plant adaptation to other stresses, including ammonium stress, phosphate deficiency, and pathogen attack. In this review, we discuss and scrutinize the relevance of apoplastic Fe for plant behavior changes in response to stress cues. We mainly focus on the relevant components that modulate the actions and downstream events of apoplastic Fe in stress signaling networks.

Automated summary

Iron (Fe) is a crucial micronutrient for plants and is stored in the apoplast as an important Fe pool. Plants have developed strategies to re-utilize this apoplastic Fe pool to adapt to Fe deficiency and other stresses. This review focuses on the relevance of apoplastic Fe in modulating plant behavior changes in response to stress cues, specifically discussing the components involved in stress signaling networks.