IP21 — Solanum tuberosum

Summary

StIP21 (IP21, CEVI57) on potato chromosome 3 encodes a proteinase inhibitor type-2 CEVI57 belonging to the protease inhibitor I20 family and has serine-type endopeptidase inhibitor activity. It is associated with downregulation of photosynthesis, induced systemic resistance, phloem transport, auxin transport, cytokinin signaling, and phytoalexin biosynthesis, as well as hormone, sterol, starch, and primary metabolism, protein stabilization, and the MVA pathway. The gene is linked to traits including potassium concentration, seed weight, plant height, germination rate, and ethylene sensitivity. Studies of related genes in other species connect the family to leaf weight, leaf temperature, transpiration rate, and seed dormancy. The protein localizes to the extracellular space.