IP5 — Triticum aestivum

Summary

TRAESCS2A02G497700, designated TaIP5 (also known as TaIPK1 or IPK1) on wheat chromosome 2A, encodes an inositol pentakisphosphate 2-kinase (EC 2.7.1.158) that also exhibits RNA helicase activity and mRNA binding. This gene is associated with phytic acid content, iron and zinc accumulation, and seed number per spikelet in bread wheat. It is linked to inositol phosphate anabolism, phytate biosynthesis, intracellular phosphate homeostasis, and poly(A)+ mRNA nuclear export. Associations extend to seed development, lateral root development, antiviral and defence responses to fungi and bacteria, and responses to heat, cold, and abscisic acid. The protein localises to the nucleus, cytosol, and nuclear envelope. TaIP5 is also connected to grain protein content, grain weight, spike length, plant height, flowering time, and tolerances to drought, salinity, and high and low temperature stress. Studies of related genes in other species link the family to phytate synthesis, seed phosphate content, arsenate tolerance, and defence responses.