Plant low potassium stress resistant related protein GmWRKY50 as well as encoding gene and application thereof

The invention discloses a plant low potassium stress resistant related protein GmWRKY50 as well as an encoding gene and application thereof. The protein GmWRKY50 comes from soybean (Glycine max(L.)Merr.), and is the protein of the following a) or b): a) a protein consisting of amino acid sequences shown as a sequence 1 in a sequence table; and b) a protein which is subjected to substitution and/or deletion and/or addition of one or more amino acid residues in the amino acid sequences of the sequence 1 in the sequence table, is related to the low potassium stress resistance and/or volume and number of organs and is derived from (a). The experiment proves that the low potassium stress resistance of the T3 generation homozygous transgenic plant obtained by the recombinant expression vector GmWRKY50 Arabidopsis containing the DNA molecules shown by the sequence 2 in the sequence table for encoding the protein is obviously higher than that of the wild Arabidopsis plant under the same condition. The protein has significance in breeding and research for improving the low potassium stress resistance.