Provided are applications of protein VdAL in improving the output, product quality and drought resistance of a plant and in improving fruit coloring of the plant. The protein VdAL is selected from one of A1) to A3): A1), protein having an amino acid sequence that is 1； A2) protein that is derived from A), that has same functions and that is obtained by substituting and/or deleting and/or adding one or several amino acid residues for, from or to the sequence 1； and A3) fusion protein obtained by connecting labels to an N end and/or a C end of A1) or A2).
