The invention discloses a plant stress tolerance correlated protein as well as an encoding gene ScMYB3R1 and applications thereof. The protein is a protein (a) or (b) shown as follows: a protein of which the amino acid sequence is shown in a sequence 2 in a sequence table; and (b) a protein which is obtained by carrying out substitution and/or deletion and/or addition on the amino acid sequence shown in the sequence 2 in the sequence table by using one or more amino acid residues and can improve the plant stress tolerance correlation. Experiments show that the protein provided by the invention has a function of improving the plant stress tolerance, and the protein has an important application value in the aspect of plant breeding.