GhCPS and GhKS Encoding Gibberellin Biosynthesis Enzymes Involve in Inhibition of Leaf Growth by Mepiquat Chloride in Cotton (Gossypium hirsutum L.) Functional Characterization of ApCPS Involved in Andrographolides Biosynthesis by Virus-induced Gene Silencing Study on active components of Andrographis paniculata at various growth periodsand differential expression of key enzyme gene