Fig. 1

(A) Buds (B) and flowers (F) of Dendrobium officinale. (B) The content of total flavonoids, total phenols, and polysaccharides in Dendrobium officinale flower at different developmental stages. (C) The content of total amino acid of Dendrobium officinale flower during development periods. (D) The content of different types of amino acids of Dendrobium officinale flower during development periods.