Probable transcription factor involved in the regulation of plant height by elongating internode cell length (PubMed:28708834). Involved in the positive regulation of grain yield (PubMed:28708834). May be involved in the regulation of genes related to cell elongation and cell wall synthesis, which are associated with plant height and yield phenotypes (PubMed:28708834). Plays a role in tolerance to cadmium stress (PubMed:28969789). Highly expressed in the pulvinus and stem nodes (PubMed:28708834). Expressed in the plumule of germinating seeds, coleoptile, leaves, internodes, leave sheaths, spikes and roots (PubMed:28708834). Induced by cadmium in roots. Increased sensitivity to cadmium stress and increased accumulation of hydrogen peroxide in leaves upon cadmium treatment. Plants overexpressing MPH1 exhibit increased plant height due to increased length of internodes (PubMed:28708834). Plants overexpressing MPH1 exhibit increased grain yield (PubMed:28708834). Plant silencing MPH1 exhibit decreased plant height due to decreased length of internodes (PubMed:28708834). Plants silencing MPH1 exhibit decreased grain yield (PubMed:28708834).