Isolation and Tissue-specific Expression of Chalcone Synthase Gene Ps-CHS1 in Tree Peony Cloning and Expression Analysis of Chalcone Isomerase Gene cDNA from Camellia nitidissima Isolation and Tissue-specific Expression of Chalcone Synthase Gene Ps-CHS1 in Tree Peony cDNA Cloning and Expression Analysis of CjAPL1 Gene from Camellia japonica