A flower tissue-specific promoter, and uses thereof, is the promoter for Phalaenopsis 1-aminocyclopropane-1-carboxylic acid synthase, ACC synthase gene PtACS2, and has a sequence as shown in SEQ ID No: 2. The invention further provides a gene expression cassette, which is composed of a promoter having a DNA sequence as SEQ ID No: 2, and a polynucleotide with an open reading frame linked to the 3' end of said promoter, wherein said promoter can activate transcription of said polynucleotide in an organism containing said gene expression cassette. The invention provides furthermore a gene expression vector, which is composed of a promoter having a DNA sequence as SEQ ID No: 2. The invention provides further a method for producing a transgenic plant or parts of organ, tissue or cell of the transgenic plant that contain a gene expression cassette described above.