RBOHB — Phaseolus vulgaris

Summary

PHAVU_007G196800 (symbol RBOHB, preferred name PvRBOHB) on chromosome 7 of French bean (Phaseolus vulgaris) encodes a respiratory burst oxidase homolog protein B, a NADPH oxidase family member containing EF-hand calcium-binding domains, FAD- and NAD-binding domains, and a cytochrome b245 heavy chain domain. The encoded enzyme has NAD(P)H oxidase H2O2-forming activity and peroxidase activity, and binds calcium ions. The protein localizes to the plasmalemma and is associated with the metabolic burst, organogenesis, nitrogen fixation, nodulation, cell cycle modulation, cell division, cell growth, root and lateral root development, defense response, and response to heat. It has been linked to photosynthetic rate, root length, and nematode resistance. Studies of related genes in other species connect the RBOHB family to drought tolerance, submergence tolerance, seed after-ripening and germination, thermotolerance, and resistance to leaf-infecting pathogens.