The invention provides
bacillus subtilis KC-1 as well as a composition and application thereof, and belongs to the technical field of microorganisms. The preservation number of the
bacillus subtilis KC-1 is CGMCC (China General
Microbiological Culture Collection Center) No.35237. The
bacillus subtilis KC-1 can secrete IAA, has
nitrogen fixation capacity and can generate siderophores. The bacillus subtilis KC-1 and
whey protein are used as a composition, and the bacillus subtilis KC-1 and the
whey protein jointly act to prepare the
seed treatment material, so that a synergistic effect can be achieved, and corn seed
germination and
seedling root development are remarkably promoted. Experiments show that compared with
single use of the
whey protein and the bacillus subtilis KC-1, the
combined use of the whey
protein and the bacillus subtilis KC-1 can significantly improve the seed
germination rate, the length of buds on the overground part, the length of main roots on the underground part, the total
root volume, the total
root surface area, the total
root length and the
seedling auxin concentration, and also can significantly reduce the concentration of
abscisic acid in seedlings, so that the
survival rate of the seedlings is improved. The
germination of seeds and the growth of seedlings under drought conditions are promoted, and the
drought resistance of plants is improved.