Phospholipase Dα1 Acts as a Negative Regulator of High Mg-Induced Leaf Senescence in Arabidopsis.

Magnesium (Mg) is a macronutrient involved in essential cellular processes. Its deficiency or excess is a stress factor for plants, seriously affecting their growth and development and therefore, its accurate regulation is essential. Recently, we discovered that phospholipase Dα1 (PLDα1) activity is vital in the stress response to high-magnesium conditions in Arabidopsis roots.

Phospholipase Dα1 mediates the high-Mg stress response partially through regulation of K homeostasis.

Intracellular levels of Mg are tightly regulated, as Mg deficiency or excess affects normal plant growth and development. In Arabidopsis, we determined that phospholipase Dα1 (PLDα1) is involved in the stress response to high-magnesium conditions. The T-DNA insertion mutant pldα1 is hypersensitive to increased concentrations of magnesium, exhibiting reduced primary root length and fresh weight.