HY8 — Phaseolus vulgaris

Summary

PvHY8 (PHAVU_007G206800) on French bean chromosome 7 encodes a member of the phytochrome A-E family with domains including GAF, PAS, and histidine kinase, and is annotated with photoreceptor activity, tetrapyrrole binding, and DNA-binding transcription activator activity. The gene is associated with far-red light sensitivity, photoperiod sensitivity, light quality response, and positive regulation of phytochrome signaling. It is linked to grain yield, seed set percent, vegetative vigor, leaf area, leaf angle, branch angle, inflorescence length, flower diameter, fruit set, and seedling cotyledon size. Associations also include heat stress tolerance, oxidative stress response, root development, embryo morphogenesis, cell wall synthesis, meiotic recombination, and jasmonic acid/ethylene-mediated immunity. The gene is connected to chloroplast-nucleus signaling, chromatin organization, and thermomorphogenesis. Studies of related genes in other species link the family to far-red light signaling, flowering, thermotolerance, pathogen defense, and auxin signaling.