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Engineering osmotolerant plants is a challenge for modern agriculture. An interaction between osmotic stress response and phosphate homeostasis has been reported in plants, but the identity of molecules involved in this interaction remains unknown. In this study we assessed the role of phytic acid (PA) in response to osmotic stress and/or phosphate deficiency in  Arabidopsis thaliana . For this purpose, we used  Arabidopsis  lines (L7 and L9) expressing a bacterial beta-propeller phytase PHY-US417, and a mutant in  inositol polyphosphate kinase 1  gene ( ipk1-1 ), which were characterized by low PA content, 40% (L7 and L9) and 83% ( ipk1-1 ) of the wild-type (WT) plants level. We show that the  PHY -overexpressor lines have higher osmotolerance and lower sensitivity to abscisic acid than  ipk1-1  and WT. Furthermore,  PHY -overexpressors showed an increase by more than 50% in foliar ascorbic acid levels and antioxidant enzyme activities compared to  ipk1-1  and WT plants. Finally,  PHY -overexpressors are more tolerant to combined mannitol stresses and phosphate deficiency than WT plants. Overall, our results demonstrate that the modulation of PA improves plant growth under osmotic stress, likely via stimulation of enzymatic and non-enzymatic antioxidant systems, and that beside its regulatory role in phosphate homeostasis, PA may be also involved in fine tuning osmotic stress response in plants.

Phytase overexpression in Arabidopsis improves plant growth under osmotic stress and in combination with phosphate deficiency