The role of gibberellin in iron homeostasis in rice

The plant hormone gibberellin (GA) participates in many physiological processes. However, little is known about the role of GA in responses to nutrient deficiency in general and iron deficiency in particular. Wang et al. demonstrate that GA negatively regulates iron-deficiency-responses in rice.

Effect of GA application on leaf chlorophyll of WT (ZS 97), eui1 and EUI-OE plants grown under Fe-sufficient and Fe-deficient conditions.

Effect of GA application on leaf chlorophyll of WT (ZS 97), eui1 and EUI-OE plants grown under Fe-sufficient and Fe-deficient conditions. One-week-old rice plants of WT, eui1 and EUI-OE pre-cultured with Fe (III)-EDTA were exposed to Fe-sufficient [100 µm Fe (III)-EDTA] or Fe-deficient [0 µm Fe (III)-EDTA] with or without 0·1 µm GA for 1 week. Full details in Wang et al. 2017.

Exogenous application of GA exaggerated foliar chlorosis and reduced growth of wild-type plants, while an enhanced endogenous GA level in the rice mutant (eui1) was associated with reduced foliar iron concentrations. Exposure of wild-type rice plants to an iron-deficient medium led to a reduction in endogenous GA concentration.

Reference

Wang, B., Wei, H., Xue, Z., & Zhang, W.-H. (2017). Gibberellins regulate iron deficiency-response by influencing iron transport and translocation in rice seedlings (Oryza sativa). Annals of Botany, mcw250. https://doi.org/10.1093/aob/mcw250