*Opinion***Plant Sulfate Transporters in the Low Phytic Acid Network: Some Educated Guesses**

### **Gian Attilio Sacchi and Fabio Francesco Nocito \***

Dipartimento di Scienze Agrarie e Ambientali—Produzione, Territorio, Agroenergia, gianattilio.sacchi@unimi.it

Università degli Studi di Milano, 20133 Milano, Italy;

**\*** Correspondence: fabio.nocito@unimi.it

Received: 29 November 2019; Accepted: 16 December 2019; Published: 17 December 2019

**Abstract:** A few new papers report that mutations in some genes belonging to the group 3 of plant sulfate transporter family result in low phytic acid phenotypes, drawing novel strategies and approaches for engineering the low-phytate trait in cereal grains. Here, we shortly review the current knowledge on phosphorus/sulfur interplay and sulfate transport regulation in plants, to critically discuss some hypotheses that could help in unveiling the physiological links between sulfate transport and phosphorus accumulation in seeds.

**Keywords:** sulfate transporters; phytic acid; sulfur; phosphorous
