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1. A method for elevating anti-stress ability of a plant using a plant growth regulator composition including Lactobacillus fermenting culture solution, comprising administering a Lactobacillus fermenting culture solution to a whole body, a portion and/or a culture medium of a plant, the Lactobacillus fermenting culture solution consisting of a thermally sterilized fermenting culture solution consisting of a Lactobacillus paracasei GMNL-32 fermentation culture stock solution treated under 90° C. to 121° C. for 15 minutes to 30 minutes, wherein the Lactobacillus fermenting culture solution is a 10-fold dilution of the Lactobacillus paracasei GMNL-32 fermentation culture stock solution, and the Lactobacillus paracasei GMNL-32 is deposited with an accession number of CCTCC M 204012 in China Center for Type Culture Collection (CCTCC), Wuhan University, Wuhan 430072, People's Republic of China, on Feb. 19, 2004, thereby elevating an ability against biotic stresses of the plant, wherein the biotic stress comprises an infection of a pathogen, the pathogen consists of Colletotrichum species, and the Colletotrichum species comprises Colletotrichum gloeosporioides.
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