Transcription factor involved in abiotic stress responses (PubMed:17293435, PubMed:19279197). May play a regulatory role in tolerance to salt, cold, and drought stresses (PubMed:17293435). Transcriptional activator that binds specifically to a mitosis-specific activator cis-element 5'-(T/C)C(T/C)AACGG(T/C)(T/C)A-3', found in promoters of cyclin genes such as CYCB1-1 and KNOLLE (AC Q84R43). Positively regulates a subset of G2/M phase-specific genes, including CYCB1-1, CYCB2-1, CYCB2-2, and CDC20.1 in response to cold treatment (PubMed:19279197). Expressed in roots, leaves, stems and spikes. Induced by cold, drought and salt stresses. Plants over-expressing MYB3R-2 show increased tolerance to freezing (PubMed:19279197). Plants over-expressing MYB3R-2 show retarded growth, increased tolerance to cold, drought and salt stresses, and have decreased sensitivity to seed germination inhibition by abscisic acid (ABA) or salt (PubMed:17293435). Truncated N-terminus. Truncated N-terminus.