PI — Arabidopsis thaliana

Summary

AT5G20240, designated PI (PISTILLATA) on Arabidopsis thaliana chromosome 5, encodes a protein containing MADS-box, MEF2-like, and K-box domains. The protein is annotated with sequence-specific DNA binding, protein dimerization activity, nucleosome array spacer activity, and RNA polymerase II transcription regulatory region sequence-specific DNA binding. PI is associated with stamen and petal formation, stamen morphogenesis, embryo sac morphogenesis, sex determination, and floral organ identity specification. The gene is linked to floral and reproductive traits including petal number and morphology, stamen number and morphology, carpel shape and number, floral organ size, inflorescence branching, seed shattering, and plant male sterility. Additional associations include leaf area index, stem length, phyllotaxy, photoperiod-sensitive flowering time, seed longevity, and bacterial blight disease resistance. The protein localizes to the nucleus, cytoplasm, and plasmodesmata.