The defense protein (MD) contains at least two kinds of defense peptides, plus a kind of space peptide which can resist endocrine division, plus the components including MD protein and transgenic or transgenic plants or microorganisms, which are inhibited by MD Growth of pathogenic bacteria Those MD protein composersPlants and microorganisms can provide better ways to inhibit the growth of organisms, compared with proteins containing only one defensive peptide found by the Ministry of defense. Minus 70%seventy-five percenteighty percenteighty-five percentninety percentninety-five percentninety-eight percentninety-nine percentO 100% sequence identity, by selecting the full-length sequence of a group of polypeptides from SEQ ID No.57, SEQ ID No.69, SEQ ID No.73 and SEQ ID No.112, or containing at least 92% of the polypeptides protected by Domaine,ninety-five percentninety-eight percentninety-nine percentOr 100% of the sequence identity passes through the entire length of the SEQ ID 111 polypeptide, in which case the polynucleotide is operatively associated with at least one polynucleotide that facilitates transcription, bulk transcription, translation, or one of the combinations. Claim 55: a method for obtaining transgenic plants resistant to fungal infection of plant pathogens, including (I) incorporating any one to four requirements into all stages of recombinant nucleic acid molecules of cells, tissues, parts of plants or whole plants；(ii) obtaining a cell, a tissue, a part of a plant, or an entire plant in which the recombinant nucleic acid molecule has been integrated into the plastid or nuclear genome of the plant； and (iii) selecting a transgenic plant obtained from the cell, tissue, plant part, or the entire plant of step (ii) for expression of an inhibitory amount of plant pathogenic fungus of the multimeric defensin polypeptide, so as to obtain a transgenic plant that is resistant to infection by a pathogenic plant fungus. Claim 62: A method for reducing cro
