To control plant diseases caused by Xanthomonas spp., a novel bacteriophage exhibiting bacteriolysis activity specifically on Xanthomonas spp. was isolated. Thus, developed and provided is a plant disease control composition containing the bacteriophage as an active ingredient. Provided are a bacteriolytic agent containing a bacteriophage that has a novel genomic DNA sequence and exhibits bacteriolysis activity specifically on Xanthomonas spp., and a plant disease control composition containing the same as an active ingredient.

To control plant diseases caused by Xanthomonas spp., a novel bacteriophage exhibiting bacteriolysis activity specifically on Xanthomonas spp. was isolated. Thus, developed and provided is a plant disease control composition containing the bacteriophage as an active ingredient. Provided are a bacteriolytic agent containing a bacteriophage that has a novel genomic DNA sequence and exhibits bacteriolysis activity specifically on Xanthomonas spp., and a plant disease control composition containing the same as an active ingredient.

A process is disclosed for production of a polyhydroxyalkanoate that includes depolymerization of a post-consumer polyhydroxyalkanoate and utilization of the hydroxyalkanoate monomer thus produced as a carbon source for a microorganism capable of production of a polyhydroxyalkanoate. Methods can be utilized for true cyclic use of polyhydroxyalkanoates including polyhydroxybutyrates. Various aspects are described including simultaneous depolymerization and polymer production, utilization of purified depolymerase enzymes and/or microorganisms that express a depolymerase in conjunction with a microorganism that produces polymer, utilization of microorganisms that produce both a depolymerase and a new polymer, and utilization of genetically modified organisms to produce natural or modified depolymerase enzymes.

A process is disclosed for production of a polyhydroxyalkanoate that includes depolymerization of a post-consumer polyhydroxyalkanoate and utilization of the hydroxyalkanoate monomer thus produced as a carbon source for a microorganism capable of production of a polyhydroxyalkanoate. Methods can be utilized for true cyclic use of polyhydroxyalkanoates including polyhydroxybutyrates. Various aspects are described including simultaneous depolymerization and polymer production, utilization of purified depolymerase enzymes and/or microorganisms that express a depolymerase in conjunction with a microorganism that produces polymer, utilization of microorganisms that produce both a depolymerase and a new polymer, and utilization of genetically modified organisms to produce natural or modified depolymerase enzymes.

Xanthomonas campestris for fermentative production of transparent xanthan gum and a method for using Xanthomonas campestris are provided. The Xanthomonas campestris is Xanthomonas campestris F417-6, deposited in Guangdong Province Microbiological Culture Collection Center on May 12, 2023, with a deposit number of GDMCC NO: 63459. The method includes preparing xanthan gum by performing fermentation using the Xanthomonas campestris as a fermentation strain.